78 changed files with 602 additions and 921 deletions
--- a/README.md
+++ b/README.md
@ -22,45 +22,40 @@ nix flake new --template github:the-nix-way/dev-templates#rust ${NEW_PROJECT_DIR

 Once your preferred template has been initialized, you can use the provided shell in two ways:

-1. If you have  installed, you can initialize the environment by running `direnv allow`.
+1. If you have [`nix-direnv`][nix-direnv] installed, you can initialize the environment by running `direnv allow`.
 2. If you don't have `nix-direnv` installed, you can run `nix develop` to open up the Nix-defined shell.

 ## Available templates

-| Language/framework/tool      | Template                     |
-| :--------------------------- | :--------------------------- |
-| [Clojure][Clojure]           | [`clojure`](./clojure/)       |
-| [C#][csharp]                 | [`csharp`](./csharp/)         |
-| [Cue][Cue]                   | [`cue`](./cue/)               |
-| [Dhall][Dhall]               | [`dhall`](./dhall/)           |
-| [Elixir][Elixir]             | [`elixir`](./elixir/)         |
-| [Elm][Elm]                   | [`elm`](./elm/)               |
-| Empty (change at will)       | [`empty`](./empty)            |
-| [Gleam][Gleam]               | [`gleam`](./gleam/)           |
-| [Go][Go]                     | [`go`](./go/)                 |
-| [Hashicorp][Hashicorp] tools | [`hashi`](./hashi/)           |
-| [Haxe][Haxe]                 | [`haxe`](./haxe/)             |
-| [Java][Java]                 | [`java`](./java/)             |
-| [Jupyter]                    | [`jupyter`](./jupyter/)       |
-| [Kotlin][Kotlin]             | [`kotlin`](./kotlin/)         |
-| [LaTeX][LaTeX]               | [`latex`](./latex/)           |
-| [Nickel][Nickel]             | [`nickel`](./nickel/)         |
-| [Nim][Nim]                   | [`nim`](./nim/)               |
-| [Nix][Nix]                   | [`nix`](./nix/)               |
-| [Node.js][node]              | [`node`](./node/)             |
-| [OCaml][OCaml]               | [`ocaml`](./ocaml/)           |
-| [Open Policy Agent][opa]     | [`opa`](./opa)                |
-| [PHP][PHP]                   | [`php`](./php/)               |
-| [Protobuf][Protobuf]         | [`protobuf`](./protobuf/)     |
-| [Pulumi][Pulumi]             | [`pulumi`](./pulumi/)         |
-| [Purescript][Purescript]     | [`purescript`](./purescript/) |
-| [Ruby][Ruby]                 | [`ruby`](./ruby/)             |
-| [Rust][Rust]                 | [`rust`](./rust/)             |
-| [RustPython][Rust]           | [`rustpython`](./rustpython/) |
-| [Scala][Scala]               | [`scala`](./scala/)           |
-| [Shell]                      | [`shell`](./shell/)           |
-| [Vlang][Vlang]               | [`vlang`](./vlang/)           |
-| [Zig][Zig]                   | [`zig`](./zig/)               |
+| Language/framework/tool  | Template                      |
+| :----------------------- | :-----------------------------|
+| [Clojure]                | [`clojure`](./clojure/)       |
+| [C#][csharp]             | [`csharp`](./csharp/)         |
+| [Cue]                    | [`cue`](./cue/)               |
+| [Dhall]                  | [`dhall`](./dhall/)           |
+| [Elixir]                 | [`elixir`](./elixir/)         |
+| [Elm]                    | [`elm`](./elm/)               |
+| [Gleam]                  | [`gleam`](./gleam/)           |
+| [Go]                     | [`go`](./go/)                 |
+| [Hashicorp] tools        | [`hashi`](./hashi/)           |
+| [Java]                   | [`java`](./java/)             |
+| [Kotlin]                 | [`kotlin`](./kotlin/)         |
+| [LaTeX]                  | [`latex`](./latex/)           |
+| [Nickel]                 | [`nickel`](./nickel/)         |
+| [Nim]                    | [`nim`](./nim/)               |
+| [Nix]                    | [`nix`](./nix/)               |
+| [Node.js][node]          | [`node`](./node/)             |
+| [OCaml]                  | [`ocaml`](./ocaml/)           |
+| [Open Policy Agent][opa] | [`opa`](./opa)                |
+| [PHP]                    | [`php`](./php/)               |
+| [Protobuf]               | [`protobuf`](./protobuf/)     |
+| [Pulumi]                 | [`pulumi`](./pulumi/)         |
+| [Purescript]             | [`purescript`](./purescript/) |
+| [Ruby]                   | [`ruby`](./ruby/)             |
+| [Rust]                   | [`rust`](./rust/)             |
+| [Scala]                  | [`scala`](./scala/)           |
+| [Shell]                  | [`shell`](./shell/)           |
+| [Zig]                    | [`zig`](./zig/)               |

 ## Template contents

@ -68,141 +63,132 @@ The sections below list what each template includes. In all cases, you're free t

 ### [`clojure`](./clojure/)

- [Clojure][Clojure] 1.11.1.1347
- [Boot][Boot] 2.8.3
- [Leiningen][Leiningen] 2.10.0
+- [Clojure] 1.11.1.1347
+- [Boot] 2.8.3
+- [Leiningen] 2.10.0

 ### [`csharp`](./csharp/)

- [dotnet][dotnet] sdk 7 (7.0.305)
- [omnisharp-roslyn][omnisharp-roslyn]
- [Mono][Mono] 6.12.0.182
- [msbuild][msbuild] 16.10.1
+- [dotnet] sdk 7 (7.0.305)
+- [omnisharp-roslyn]
+- [Mono] 6.12.0.182
+- [msbuild] 16.10.1

 ### [`cue`](./cue/)

- [Cue][Cue] 0.5.0
+- [Cue] 0.5.0

 ### [`dhall`](./dhall)

- [Dhall][Dhall] 1.41.2
- [dhall-bash][dhall-bash]
- [dhall-docs][dhall-docs]
- [dhall-json][dhall-json]
- [dhall-lsp-server][dhall-lsp-server]
- [dhall-nix][dhall-nix]
- [dhall-nixpkgs][dhall-nixpkgs]
- [dhall-openapi][dhall-openapi]
- [dhall-toml][dhall-toml]
- [dhall-yaml][dhall-yaml]
+- [Dhall] 1.41.2
+- [dhall-bash]
+- [dhall-docs]
+- [dhall-json]
+- [dhall-lsp-server]
+- [dhall-nix]
+- [dhall-nixpkgs]
+- [dhall-openapi]
+- [dhall-toml]
+- [dhall-yaml]

 ### [`elixir`](./elixir/)

- [Elixir][Elixir] 1.14.5, including [mix][mix] and [IEx][IEx]
- [gigalixir][gigalixir] (Linux only)
+- [Elixir] 1.14.5, including [mix] and [IEx]
+- [gigalixir] (Linux only)

 ### [`elm`](./elm/)

- [Elm][Elm] 0.19.1
- [elm2nix][elm2nix]
-
-### [Empty](./empty/)
-
-A dev template that's fully customizable.
+- [Elm] 0.19.1
+- [elm2nix]

 ### [`gleam`](./gleam/)

- [Gleam][Gleam] 0.30.0
+- [Gleam] 0.30.0

 ### [`go`](./go/)

- [Go][Go] 1.20.5
- Standard Go tools ([goimports][goimports], [godoc][godoc], and others)
- [golangci-lint][golangci-lint]
+- [Go] 1.20.5
+- Standard Go tools ([goimports], [godoc], and others)
+- [golangci-lint]

 ### [`hashi`](./hashi/)

- [Packer][Packer] 1.8.6
- [Terraform][Terraform] 1.5.2
- [Nomad][Nomad] 1.4.6
- [Vault][Vault] 1.13.3
- [nomad-autoscaler][nomad-autoscaler] 0.3.6-dev
- [nomad-pack][nomad-pack] 0.0.1-techpreview.3
- [levant][levant] 0.3.2-dev
- [damon][damon]
- [Terragrunt][Terragrunt] 0.45.13
- [tflint][tflint] 0.46.1
+- [Packer] 1.8.6
+- [Terraform] 1.5.2
+- [Nomad] 1.4.6
+- [Vault] 1.13.3
+- [nomad-autoscaler] 0.3.6-dev
+- [nomad-pack] 0.0.1-techpreview.3
+- [levant] 0.3.2-dev
+- [damon]
+- [Terragrunt] 0.45.13
+- [tflint] 0.46.1

 ### [`haskell`](./haskell/)

 - [GHC][haskell] 9.2.8
- [cabal][cabal] 3.10.1.0
-
-### [`haxe`](./haxe/)
-
- [Haxe][Haxe] 4.2.5
+- [cabal] 3.10.1.0

 ### [`java`](./java)

- [Java][Java] 20.0.1+9
- [Maven][Maven] 3.9.2
- [Gradle][Gradle] 9.0.1
- [jdtls][jdtls] 1.31.0
+- [Java] 20.0.1+9
+- [Maven] 3.9.2
+- [Gradle] 9.0.1

 ### [`kotlin`](./kotlin/)

- [Kotlin][Kotlin] 1.9.0
- [Gradle][Gradle] 8.0.1
+- [Kotlin] 1.9.0
+- [Gradle] 8.0.1

 ### [`latex`](./latex/)

- [texlive][texlive]
- [tectonic][tectonic]
- [texlab][texlab]
+- [texlive]
+- [tectonic]
+- [texlab]

 ### [`nickel`](./nickel/)

- [Nickel][Nickel] 0.2.0
+- [Nickel] 0.2.0

 ### [`nim`](./nim)

- [Nim][Nim] 1.6.14
- [nimble][nimble] 0.14.2
+- [Nim] 1.6.14
+- [nimble] 0.14.2

 ### [`nix`](./nix/)

- [Cachix][Cachix] 1.6
- [dhall-to-nix][dhall-to-nix] 1.1.25
- [lorri][lorri] 1.6.0
- [niv][niv] 0.2.22
- [nixfmt][nixfmt] 0.5.0
- [statix][statix] 0.5.6
- [vulnix][vulnix]
+- [Cachix] 1.6
+- [dhall-to-nix] 1.1.25
+- [lorri] 1.6.0
+- [niv] 0.2.22
+- [nixfmt] 0.5.0
+- [statix] 0.5.6
+- [vulnix]

 ### [`node`](./node/)

 - [Node.js][node] 18.16.1
- [npm][npm] 9.5.1
- [pnpm][pnpm] 8.6.6
- [Yarn][Yarn] 1.22.19
- [node2nix][node2nix] 1.11.1
+- [npm] 9.5.1
+- [pnpm] 8.6.6
+- [Yarn] 1.22.19
+- [node2nix] 1.11.1

 ### [`ocaml`](./ocaml/)

- [OCaml][OCaml] 4.14.1
- [Dune][Dune] 3.9.1
- [odoc][odoc] 2.2.0
- [ocamlformat][ocamlformat] 0.25.1
+- [OCaml] 4.14.1
+- [Dune] 3.9.1
+- [odoc] 2.2.0
+- [ocamlformat] 0.25.1

 ### [`opa`](./opa/)

 - [Open Policy Agent][opa] 0.54.0
- [Conftest][Conftest] 0.44.0
+- [Conftest] 0.44.0

 ### [`php`](./php/)

- [PHP][PHP] 8.2.8
- [Composer][Composer] 2.5.8
+- [PHP] 8.2.8
+- [Composer] 2.5.8

 ### [`protobuf`](./protobuf/)

@ -211,61 +197,59 @@ A dev template that's fully customizable.

 ### [`pulumi`](./pulumi/)

- [Pulumi][Pulumi] 3.72.1
- [Python][Python] 3.11.4
- [Go][Go] 1.20.5
+- [Pulumi] 3.72.1
+- [Python] 3.11.4
+- [Go] 1.20.5
 - [Node.js][node] 18.16.1
- [dotnet][dotnet] sdk 6
- [Java][Java] 19.0.1 and [Maven][Maven] 3.9.2
- [jq][jq] 1.6
+- [dotnet] sdk 6
+- [Java] 19.0.1 and [Maven] 3.9.2
+- [jq] 1.6

 ### [`purescript`](./purescript/)

- [Purescript][Purescript] (purs) 0.15.9
- [Spago][Spago] 0.21.0
- [purescript-language-server][purescript-language-server] 0.17.1
- [purs-tidy][purs-tidy] 0.10.0
+- [Purescript] (purs) 0.15.9
+- [Spago] 0.21.0
+- [purescript-language-server] 0.17.1
+- [purs-tidy] 0.10.0

 ### [`python`](./python/)

- [Python][Python] 3.11.4
- [pip][pip] 23.0.1
+- [Python] 3.11.4
+- [pip] 23.0.1
+- [Virtualenv] 20.19.0

 ### [`ruby`](./ruby/)

- [Ruby][Ruby] 3.2.2, plus the standard Ruby tools (`bundle`, `gem`, etc.)
+- [Ruby] 3.2.2, plus the standard Ruby tools (`bundle`, `gem`, etc.)

 ### [`rust`](./rust/)

- [Rust][Rust], including [cargo][cargo], [Clippy][Clippy], and the other standard tools. The Rust version is determined as follows, in order:
+- [Rust], including [cargo], [Clippy], and the other standard tools. The Rust version is determined as follows, in order:

  - From the `rust-toolchain.toml` file if present
  - From the `rust-toolchain` file if present
  - Version 1.70.0 if neither is present
- [rust-analyzer][rust-analyzer] 2023-07-10
- [cargo-audit][cargo-audit] 0.17.0
- [cargo-deny][cargo-deny] 0.12.1
+
+- [rust-analyzer] 2023-07-10
+- [cargo-audit] 0.17.0
+- [cargo-deny] 0.12.1

 ### [`scala`](./scala/)

- [Scala][Scala] 2.13.11 ([Java][Java] 19.0.1)
- [sbt][sbt] 1.9.2
+- [Scala] 2.13.11 ([Java] 19.0.1)
+- [sbt] 1.9.2

 ### [`shell`](./shell/)

- [shellcheck][shellcheck] 0.9.0
-
-### [`Vlang`](./vlang/)
-
- [Vlang][Vlang] 0.4.4
+- [shellcheck] 0.9.0

 ### [`zig`](./zig/)

- [Zig][Zig] 0.10.1
+- [Zig] 0.10.1

 ## Code organization

-All of the templates have only the root [flake](./flake.nix) as a flake input. That root flake provides a common revision of [Nixpkgs][Nixpkgs] and  to all the templates.
+All of the templates have only the root [flake](./flake.nix) as a flake input. That root flake provides a common revision of [Nixpkgs] and [`flake-utils`][flake-utils] to all the templates.

 [boot]: https://www.boot-clj.com
 [buf]: https://github.com/bufbuild/buf
@ -307,10 +291,8 @@ All of the templates have only the root [flake](./flake.nix) as a flake input. T
 [gradle]: https://gradle.org
 [hashicorp]: https://hashicorp.com
 [haskell]: https://haskell.org
-[haxe]: https://haxe.org/
 [iex]: https://hexdocs.pm/iex/IEx.html
 [java]: https://java.com
-[jdtls]: https://projects.eclipse.org/projects/eclipse.jdt.ls
 [jq]: https://jqlang.github.io/jq
 [kotlin]: https://kotlinlang.org
 [latex]: https://www.latex-project.org/
@ -367,7 +349,8 @@ All of the templates have only the root [flake](./flake.nix) as a flake input. T
 [texlive]: https://www.tug.org/texlive/
 [tflint]: https://github.com/terraform-linters/tflint
 [vault]: https://www.vaultproject.io
+[virtualenv]: https://pypi.org/project/virtualenv
 [vulnix]: https://github.com/flyingcircusio/vulnix
 [yarn]: https://yarnpkg.com
-[vlang]: https://vlang.io/
 [zig]: https://ziglang.org
+
--- a/clojure/flake.lock
+++ b/clojure/flake.lock
@ -2,14 +2,18 @@
  "nodes": {
    "nixpkgs": {
      "locked": {
-        "lastModified": 1717196966,
-        "narHash": "sha256-yZKhxVIKd2lsbOqYd5iDoUIwsRZFqE87smE2Vzf6Ck0=",
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
+        "lastModified": 1689261696,
+        "narHash": "sha256-LzfUtFs9MQRvIoQ3MfgSuipBVMXslMPH/vZ+nM40LkA=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "df1eee2aa65052a18121ed4971081576b25d6b5c",
+        "type": "github"
      },
      "original": {
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
      }
    },
    "root": {
--- a/clojure/flake.nix
+++ b/clojure/flake.nix
@ -1,7 +1,7 @@
 {
  description = "A Nix-flake-based Clojure development environment";

-  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";

  outputs = { self, nixpkgs }:

--- a/csharp/flake.lock
+++ b/csharp/flake.lock
@ -2,14 +2,18 @@
  "nodes": {
    "nixpkgs": {
      "locked": {
-        "lastModified": 1717196966,
-        "narHash": "sha256-yZKhxVIKd2lsbOqYd5iDoUIwsRZFqE87smE2Vzf6Ck0=",
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
+        "lastModified": 1689261696,
+        "narHash": "sha256-LzfUtFs9MQRvIoQ3MfgSuipBVMXslMPH/vZ+nM40LkA=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "df1eee2aa65052a18121ed4971081576b25d6b5c",
+        "type": "github"
      },
      "original": {
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
      }
    },
    "root": {
--- a/csharp/flake.nix
+++ b/csharp/flake.nix
@ -1,7 +1,7 @@
 {
  description = "A Nix-flake-based C# development environment";

-  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";

  outputs = { self, nixpkgs }:
    let
--- a/cue/flake.lock
+++ b/cue/flake.lock
@ -2,14 +2,18 @@
  "nodes": {
    "nixpkgs": {
      "locked": {
-        "lastModified": 1717196966,
-        "narHash": "sha256-yZKhxVIKd2lsbOqYd5iDoUIwsRZFqE87smE2Vzf6Ck0=",
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
+        "lastModified": 1689261696,
+        "narHash": "sha256-LzfUtFs9MQRvIoQ3MfgSuipBVMXslMPH/vZ+nM40LkA=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "df1eee2aa65052a18121ed4971081576b25d6b5c",
+        "type": "github"
      },
      "original": {
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
      }
    },
    "root": {
--- a/cue/flake.nix
+++ b/cue/flake.nix
@ -1,7 +1,7 @@
 {
  description = "A Nix-flake-based Cue development environment";

-  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";

  outputs = { self, nixpkgs }:

--- a/dhall/flake.lock
+++ b/dhall/flake.lock
@ -2,14 +2,18 @@
  "nodes": {
    "nixpkgs": {
      "locked": {
-        "lastModified": 1717196966,
-        "narHash": "sha256-yZKhxVIKd2lsbOqYd5iDoUIwsRZFqE87smE2Vzf6Ck0=",
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
+        "lastModified": 1689261696,
+        "narHash": "sha256-LzfUtFs9MQRvIoQ3MfgSuipBVMXslMPH/vZ+nM40LkA=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "df1eee2aa65052a18121ed4971081576b25d6b5c",
+        "type": "github"
      },
      "original": {
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
      }
    },
    "root": {
--- a/dhall/flake.nix
+++ b/dhall/flake.nix
@ -1,7 +1,7 @@
 {
  description = "A Nix-flake-based Dhall development environment";

-  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";

  outputs = { self, nixpkgs }:
    let
--- a/elixir/flake.lock
+++ b/elixir/flake.lock
@ -2,14 +2,18 @@
  "nodes": {
    "nixpkgs": {
      "locked": {
-        "lastModified": 1717196966,
-        "narHash": "sha256-yZKhxVIKd2lsbOqYd5iDoUIwsRZFqE87smE2Vzf6Ck0=",
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
+        "lastModified": 1689261696,
+        "narHash": "sha256-LzfUtFs9MQRvIoQ3MfgSuipBVMXslMPH/vZ+nM40LkA=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "df1eee2aa65052a18121ed4971081576b25d6b5c",
+        "type": "github"
      },
      "original": {
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
      }
    },
    "root": {
--- a/elixir/flake.nix
+++ b/elixir/flake.nix
@ -1,7 +1,7 @@
 {
  description = "A Nix-flake-based Elixir development environment";

-  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";

  outputs = { self, nixpkgs }:
    let
@ -15,12 +15,10 @@
        default = pkgs.mkShell {
          packages = (with pkgs; [ elixir ]) ++
            # Linux only
-            (pkgs.lib.optionals (pkgs.stdenv.isLinux)
-              (with pkgs; [ gigalixir inotify-tools libnotify ])) ++
+            pkgs.lib.optionals (pkgs.stdenv.isLinux) (with pkgs; [ gigalixir inotify-tools libnotify ]) ++
            # macOS only
-            pkgs.lib.optionals (pkgs.stdenv.isDarwin)
-              ((with pkgs; [ terminal-notifier ]) ++
-                (with pkgs.darwin.apple_sdk.frameworks; [ CoreFoundation CoreServices ]));
+            pkgs.lib.optionals (pkgs.stdenv.isDarwin) (with pkgs; [ terminal-notifier ]) ++
+            (with pkgs.darwin.apple_sdk.frameworks; [ CoreFoundation CoreServices ]);
        };
      });
    };
--- a/elm/flake.lock
+++ b/elm/flake.lock
@ -2,14 +2,18 @@
  "nodes": {
    "nixpkgs": {
      "locked": {
-        "lastModified": 1717196966,
-        "narHash": "sha256-yZKhxVIKd2lsbOqYd5iDoUIwsRZFqE87smE2Vzf6Ck0=",
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
+        "lastModified": 1689261696,
+        "narHash": "sha256-LzfUtFs9MQRvIoQ3MfgSuipBVMXslMPH/vZ+nM40LkA=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "df1eee2aa65052a18121ed4971081576b25d6b5c",
+        "type": "github"
      },
      "original": {
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
      }
    },
    "root": {
--- a/elm/flake.nix
+++ b/elm/flake.nix
@ -1,7 +1,7 @@
 {
  description = "A Nix-flake-based Elm development environment";

-  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";

  outputs = { self, nixpkgs }:
    let
--- a/empty/flake.lock
+++ b/empty/flake.lock
@ -1,23 +0,0 @@
-{
-  "nodes": {
-    "nixpkgs": {
-      "locked": {
-        "lastModified": 1717196966,
-        "narHash": "sha256-yZKhxVIKd2lsbOqYd5iDoUIwsRZFqE87smE2Vzf6Ck0=",
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
-      },
-      "original": {
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
-      }
-    },
-    "root": {
-      "inputs": {
-        "nixpkgs": "nixpkgs"
-      }
-    }
-  },
-  "root": "root",
-  "version": 7
-}
--- a/empty/flake.nix
+++ b/empty/flake.nix
@ -1,39 +0,0 @@
-{
-  description = "An empty flake template that you can adapt to your own environment";
-
-  # Flake inputs
-  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
-
-  # Flake outputs
-  outputs = { self, nixpkgs }:
-    let
-      # The systems supported for this flake
-      supportedSystems = [
-        "x86_64-linux" # 64-bit Intel/AMD Linux
-        "aarch64-linux" # 64-bit ARM Linux
-        "x86_64-darwin" # 64-bit Intel macOS
-        "aarch64-darwin" # 64-bit ARM macOS
-      ];
-
-      # Helper to provide system-specific attributes
-      forEachSupportedSystem = f: nixpkgs.lib.genAttrs supportedSystems (system: f {
-        pkgs = import nixpkgs { inherit system; };
-      });
-    in
-    {
-      devShells = forEachSupportedSystem ({ pkgs }: {
-        default = pkgs.mkShell {
-          # The Nix packages provided in the environment
-          # Add any you need here
-          packages = with pkgs; [ ];
-
-          # Set any environment variables for your dev shell
-          env = { };
-
-          # Add any shell logic you want executed any time the environment is activated
-          shellHook = ''
-          '';
-        };
-      });
-    };
-}
--- a/flake.lock
+++ b/flake.lock
@ -2,11 +2,11 @@
  "nodes": {
    "nixpkgs": {
      "locked": {
-        "lastModified": 1713805509,
-        "narHash": "sha256-YgSEan4CcrjivCNO5ZNzhg7/8ViLkZ4CB/GrGBVSudo=",
+        "lastModified": 1689261696,
+        "narHash": "sha256-LzfUtFs9MQRvIoQ3MfgSuipBVMXslMPH/vZ+nM40LkA=",
        "owner": "NixOS",
        "repo": "nixpkgs",
-        "rev": "1e1dc66fe68972a76679644a5577828b6a7e8be4",
+        "rev": "df1eee2aa65052a18121ed4971081576b25d6b5c",
        "type": "github"
      },
      "original": {
--- a/flake.nix
+++ b/flake.nix
@ -3,97 +3,63 @@

  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";

-  outputs = {
-    self,
-    nixpkgs,
-  }: let
-    overlays = [
-      (final: prev: let
-        getSystem = "SYSTEM=$(nix eval --impure --raw --expr 'builtins.currentSystem')";
-        forEachDir = exec: ''
-          for dir in */; do
-            (
-              cd "''${dir}"
+  outputs = { self, nixpkgs }:
+    let
+      overlays = [
+        (final: prev:
+          let
+            exec = pkg: "${prev.${pkg}}/bin/${pkg}";
+          in
+          {
+            format = prev.writeScriptBin "format" ''
+              ${exec "nixpkgs-fmt"} **/*.nix
+            '';
+            dvt = prev.writeScriptBin "dvt" ''
+              if [ -z $1 ]; then
+                echo "no template specified"
+                exit 1
+              fi

-              ${exec}
-            )
-          done
-        '';
-      in {
-        format = final.writeShellApplication {
-          name = "format";
-          runtimeInputs = with final; [nixpkgs-fmt];
-          text = "nixpkgs-fmt '**/*.nix'";
-        };
+              TEMPLATE=$1

-        # only run this locally, as Actions will run out of disk space
-        build = final.writeShellApplication {
-          name = "build";
-          text = ''
-            ${getSystem}
-
-            ${forEachDir ''
-              echo "building ''${dir}"
-              nix build ".#devShells.''${SYSTEM}.default"
-            ''}
-          '';
-        };
-
-        check = final.writeShellApplication {
-          name = "check";
-          text = forEachDir ''
-            echo "checking ''${dir}"
-            nix flake check --all-systems --no-build
-          '';
-        };
-
-        dvt = final.writeShellApplication {
-          name = "dvt";
-          text = ''
-            if [ -z $1 ]; then
-              echo "no template specified"
-              exit 1
-            fi
-
-            TEMPLATE=$1
-
-            nix \
-              --experimental-features 'nix-command flakes' \
-              flake init \
-              --template \
-              "github:the-nix-way/dev-templates#''${TEMPLATE}"
-          '';
-        };
-
-        update = final.writeShellApplication {
-          name = "update";
-          text = forEachDir ''
-            echo "updating ''${dir}"
-            nix flake update
-          '';
-        };
-      })
-    ];
-    supportedSystems = ["x86_64-linux" "aarch64-linux" "x86_64-darwin" "aarch64-darwin"];
-    forEachSupportedSystem = f:
-      nixpkgs.lib.genAttrs supportedSystems (system:
-        f {
-          pkgs = import nixpkgs {inherit overlays system;};
-        });
-  in
+              ${exec "nix"} \
+                --experimental-features 'nix-command flakes' \
+                flake init \
+                --template \
+                "github:the-nix-way/dev-templates#''${TEMPLATE}"
+            '';
+            update = prev.writeScriptBin "update" ''
+              for dir in `ls -d */`; do # Iterate through all the templates
+                (
+                  cd $dir
+                  ${exec "nix"} flake update # Update flake.lock
+                  ${exec "nix"} flake check  # Make sure things work after the update
+                )
+              done
+            '';
+          })
+      ];
+      supportedSystems = [ "x86_64-linux" "aarch64-linux" "x86_64-darwin" "aarch64-darwin" ];
+      forEachSupportedSystem = f: nixpkgs.lib.genAttrs supportedSystems (system: f {
+        pkgs = import nixpkgs { inherit overlays system; };
+      });
+    in
    {
-      devShells = forEachSupportedSystem ({pkgs}: {
+      devShells = forEachSupportedSystem ({ pkgs }: {
        default = pkgs.mkShell {
-          packages = with pkgs; [build check format update];
+          packages = with pkgs; [ format update ];
        };
      });

-      packages = forEachSupportedSystem ({pkgs}: rec {
+      packages = forEachSupportedSystem ({ pkgs }: rec {
        default = dvt;
        inherit (pkgs) dvt;
      });
    }
-    // {
+
+    //
+
+    {
      templates = rec {
        clojure = {
          path = ./clojure;
@ -125,11 +91,6 @@
          description = "Elm development environment";
        };

-        empty = {
-          path = ./empty;
-          description = "Empty dev template that you can customize at will";
-        };
-
        gleam = {
          path = ./gleam;
          description = "Gleam development environment";
@ -155,11 +116,6 @@
          description = "Java development environment";
        };

-        jupyter = {
-          path = ./jupyter;
-          description = "Jupyter development environment";
-        };
-
        kotlin = {
          path = ./kotlin;
          description = "Kotlin development environment";
@ -230,11 +186,6 @@
          description = "Rust development environment";
        };

-        rustpython = {
-          path = ./rustpython;
-          description = "Rustpython development environment";
-        };
-
        rust-toolchain = {
          path = ./rust-toolchain;
          description = "Rust development environment with Rust version defined by a rust-toolchain.toml file";
@ -250,11 +201,6 @@
          description = "Shell script development environment";
        };

-        vlang = {
-          path = ./vlang;
-          description = "Vlang developent environment";
-        };
-
        zig = {
          path = ./zig;
          description = "Zig development environment";
--- a/gleam/flake.lock
+++ b/gleam/flake.lock
@ -2,14 +2,18 @@
  "nodes": {
    "nixpkgs": {
      "locked": {
-        "lastModified": 1717196966,
-        "narHash": "sha256-yZKhxVIKd2lsbOqYd5iDoUIwsRZFqE87smE2Vzf6Ck0=",
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
+        "lastModified": 1689261696,
+        "narHash": "sha256-LzfUtFs9MQRvIoQ3MfgSuipBVMXslMPH/vZ+nM40LkA=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "df1eee2aa65052a18121ed4971081576b25d6b5c",
+        "type": "github"
      },
      "original": {
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
      }
    },
    "root": {
--- a/gleam/flake.nix
+++ b/gleam/flake.nix
@ -1,7 +1,7 @@
 {
  description = "A Nix-flake-based Gleam development environment";

-  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";

  outputs = { self, nixpkgs }:
    let
--- a/go/flake.lock
+++ b/go/flake.lock
@ -2,14 +2,18 @@
  "nodes": {
    "nixpkgs": {
      "locked": {
-        "lastModified": 1717196966,
-        "narHash": "sha256-yZKhxVIKd2lsbOqYd5iDoUIwsRZFqE87smE2Vzf6Ck0=",
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
+        "lastModified": 1689261696,
+        "narHash": "sha256-LzfUtFs9MQRvIoQ3MfgSuipBVMXslMPH/vZ+nM40LkA=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "df1eee2aa65052a18121ed4971081576b25d6b5c",
+        "type": "github"
      },
      "original": {
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
      }
    },
    "root": {
--- a/go/flake.nix
+++ b/go/flake.nix
@ -1,11 +1,11 @@
 {
-  description = "A Nix-flake-based Go 1.22 development environment";
+  description = "A Nix-flake-based Go 1.17 development environment";

-  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";

  outputs = { self, nixpkgs }:
    let
-      goVersion = 22; # Change this to update the whole stack
+      goVersion = 20; # Change this to update the whole stack
      overlays = [ (final: prev: { go = prev."go_1_${toString goVersion}"; }) ];
      supportedSystems = [ "x86_64-linux" "aarch64-linux" "x86_64-darwin" "aarch64-darwin" ];
      forEachSupportedSystem = f: nixpkgs.lib.genAttrs supportedSystems (system: f {
@ -16,8 +16,8 @@
      devShells = forEachSupportedSystem ({ pkgs }: {
        default = pkgs.mkShell {
          packages = with pkgs; [
-            # go 1.22 (specified by overlay)
-            go_1_22
+            # go 1.20 (specified by overlay)
+            go

            # goimports, godoc, etc.
            gotools
--- a/hashi/flake.lock
+++ b/hashi/flake.lock
@ -2,14 +2,18 @@
  "nodes": {
    "nixpkgs": {
      "locked": {
-        "lastModified": 1717196966,
-        "narHash": "sha256-yZKhxVIKd2lsbOqYd5iDoUIwsRZFqE87smE2Vzf6Ck0=",
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
+        "lastModified": 1689209875,
+        "narHash": "sha256-8AVcBV1DiszaZzHFd5iLc8HSLfxRAuqcU0QdfBEF3Ag=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "fcc147b1e9358a8386b2c4368bd928e1f63a7df2",
+        "type": "github"
      },
      "original": {
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
+        "owner": "NixOS",
+        "ref": "nixos-23.05",
+        "repo": "nixpkgs",
+        "type": "github"
      }
    },
    "root": {
--- a/hashi/flake.nix
+++ b/hashi/flake.nix
@ -3,13 +3,13 @@
    "A Nix-flake-based development environment for Terraform, Packer, and Nomad";


-  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-23.05";

  outputs = { self, nixpkgs }:
    let
      supportedSystems = [ "x86_64-linux" "aarch64-linux" "x86_64-darwin" "aarch64-darwin" ];
      forEachSupportedSystem = f: nixpkgs.lib.genAttrs supportedSystems (system: f {
-        pkgs = import nixpkgs { inherit system; config.allowUnfree = true; };
+        pkgs = import nixpkgs { inherit system; };
      });
    in
    {
--- a/haskell/flake.lock
+++ b/haskell/flake.lock
@ -2,14 +2,18 @@
  "nodes": {
    "nixpkgs": {
      "locked": {
-        "lastModified": 1717196966,
-        "narHash": "sha256-yZKhxVIKd2lsbOqYd5iDoUIwsRZFqE87smE2Vzf6Ck0=",
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
+        "lastModified": 1689261696,
+        "narHash": "sha256-LzfUtFs9MQRvIoQ3MfgSuipBVMXslMPH/vZ+nM40LkA=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "df1eee2aa65052a18121ed4971081576b25d6b5c",
+        "type": "github"
      },
      "original": {
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
      }
    },
    "root": {
--- a/haskell/flake.nix
+++ b/haskell/flake.nix
@ -1,7 +1,7 @@
 {
  description = "A Nix-flake-based Haskell development environment";

-  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";

  outputs = { self, nixpkgs }:
    let
--- a/haxe/flake.lock
+++ b/haxe/flake.lock
@ -1,23 +0,0 @@
-{
-  "nodes": {
-    "nixpkgs": {
-      "locked": {
-        "lastModified": 1717196966,
-        "narHash": "sha256-yZKhxVIKd2lsbOqYd5iDoUIwsRZFqE87smE2Vzf6Ck0=",
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
-      },
-      "original": {
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
-      }
-    },
-    "root": {
-      "inputs": {
-        "nixpkgs": "nixpkgs"
-      }
-    }
-  },
-  "root": "root",
-  "version": 7
-}
--- a/haxe/flake.nix
+++ b/haxe/flake.nix
@ -1,26 +0,0 @@
-{
-  description = "A Nix-flake-based Haxe development environment";
-
-  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
-
-  outputs =
-    { self
-    , nixpkgs
-    ,
-    }:
-    let
-      supportedSystems = [ "x86_64-linux" "aarch64-linux" "x86_64-darwin" "aarch64-darwin" ];
-      forEachSupportedSystem = f:
-        nixpkgs.lib.genAttrs supportedSystems (system:
-          f {
-            pkgs = import nixpkgs { inherit system; };
-          });
-    in
-    {
-      devShells = forEachSupportedSystem ({ pkgs }: {
-        default = pkgs.mkShell {
-          packages = with pkgs; [ haxe ];
-        };
-      });
-    };
-}
--- a/java/flake.lock
+++ b/java/flake.lock
@ -2,14 +2,18 @@
  "nodes": {
    "nixpkgs": {
      "locked": {
-        "lastModified": 1717196966,
-        "narHash": "sha256-yZKhxVIKd2lsbOqYd5iDoUIwsRZFqE87smE2Vzf6Ck0=",
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
+        "lastModified": 1689261696,
+        "narHash": "sha256-LzfUtFs9MQRvIoQ3MfgSuipBVMXslMPH/vZ+nM40LkA=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "df1eee2aa65052a18121ed4971081576b25d6b5c",
+        "type": "github"
      },
      "original": {
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
      }
    },
    "root": {
--- a/java/flake.nix
+++ b/java/flake.nix
@ -1,7 +1,7 @@
 {
  description = "A Nix-flake-based Java development environment";

-  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";

  outputs = { self, nixpkgs }:
    let
@ -21,7 +21,7 @@
    {
      devShells = forEachSupportedSystem ({ pkgs }: {
        default = pkgs.mkShell {
-          packages = with pkgs; [ gradle jdk maven jdt-language-server ];
+          packages = with pkgs; [ gradle jdk maven ];
        };
      });
    };
--- a/jupyter/.envrc
+++ b/jupyter/.envrc
@ -1 +0,0 @@
-use flake
--- a/jupyter/flake.lock
+++ b/jupyter/flake.lock
@ -1,23 +0,0 @@
-{
-  "nodes": {
-    "nixpkgs": {
-      "locked": {
-        "lastModified": 1717196966,
-        "narHash": "sha256-yZKhxVIKd2lsbOqYd5iDoUIwsRZFqE87smE2Vzf6Ck0=",
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
-      },
-      "original": {
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
-      }
-    },
-    "root": {
-      "inputs": {
-        "nixpkgs": "nixpkgs"
-      }
-    }
-  },
-  "root": "root",
-  "version": 7
-}
--- a/jupyter/flake.nix
+++ b/jupyter/flake.nix
@ -1,45 +0,0 @@
-{
-  description = "A Nix-flake-based Jupyter development environment";
-
-  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
-
-  outputs = {
-    self,
-    nixpkgs,
-  }: let
-    supportedSystems = ["x86_64-linux" "aarch64-linux" "x86_64-darwin" "aarch64-darwin"];
-    forEachSupportedSystem = f:
-      nixpkgs.lib.genAttrs supportedSystems (system:
-        f {
-          pkgs = import nixpkgs {inherit system;};
-        });
-  in {
-    devShells = forEachSupportedSystem ({pkgs}: {
-      default = pkgs.mkShell {
-        venvDir = "venv";
-        packages = with pkgs;
-          [python311 virtualenv]
-          ++ (with pkgs.python311Packages; [
-            pip
-            python-lsp-server
-            python-lsp-ruff
-            venvShellHook
-            requests
-            jupyter
-            pandas
-            numpy
-            matplotlib
-            seaborn
-            scikit-learn
-            plotnine
-            arrow
-            polars
-            pyarrow
-            ydata-profiling
-            pydot
-            graphviz
-          ]);
-      };
-    });
-  };
-}
--- a/kotlin/flake.lock
+++ b/kotlin/flake.lock
@ -2,14 +2,18 @@
  "nodes": {
    "nixpkgs": {
      "locked": {
-        "lastModified": 1717196966,
-        "narHash": "sha256-yZKhxVIKd2lsbOqYd5iDoUIwsRZFqE87smE2Vzf6Ck0=",
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
+        "lastModified": 1689261696,
+        "narHash": "sha256-LzfUtFs9MQRvIoQ3MfgSuipBVMXslMPH/vZ+nM40LkA=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "df1eee2aa65052a18121ed4971081576b25d6b5c",
+        "type": "github"
      },
      "original": {
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
      }
    },
    "root": {
--- a/kotlin/flake.nix
+++ b/kotlin/flake.nix
@ -1,7 +1,7 @@
 {
  description = "A Nix-flake-based Kotlin development environment";

-  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";

  outputs = { self, nixpkgs }:
    let
--- a/latex/flake.lock
+++ b/latex/flake.lock
@ -2,14 +2,18 @@
  "nodes": {
    "nixpkgs": {
      "locked": {
-        "lastModified": 1717196966,
-        "narHash": "sha256-yZKhxVIKd2lsbOqYd5iDoUIwsRZFqE87smE2Vzf6Ck0=",
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
+        "lastModified": 1689261696,
+        "narHash": "sha256-LzfUtFs9MQRvIoQ3MfgSuipBVMXslMPH/vZ+nM40LkA=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "df1eee2aa65052a18121ed4971081576b25d6b5c",
+        "type": "github"
      },
      "original": {
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
      }
    },
    "root": {
--- a/latex/flake.nix
+++ b/latex/flake.nix
@ -1,7 +1,7 @@
 {
  description = "A Nix-flake-based LaTeX development environment";

-  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";

  outputs = { self, nixpkgs }:
    let
--- a/nickel/flake.lock
+++ b/nickel/flake.lock
@ -2,14 +2,18 @@
  "nodes": {
    "nixpkgs": {
      "locked": {
-        "lastModified": 1717196966,
-        "narHash": "sha256-yZKhxVIKd2lsbOqYd5iDoUIwsRZFqE87smE2Vzf6Ck0=",
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
+        "lastModified": 1689261696,
+        "narHash": "sha256-LzfUtFs9MQRvIoQ3MfgSuipBVMXslMPH/vZ+nM40LkA=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "df1eee2aa65052a18121ed4971081576b25d6b5c",
+        "type": "github"
      },
      "original": {
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
      }
    },
    "root": {
--- a/nickel/flake.nix
+++ b/nickel/flake.nix
@ -1,7 +1,7 @@
 {
  description = "A Nix-flake-based Nickel development environment";

-  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";

  outputs = { self, nixpkgs }:
    let
--- a/nim/flake.lock
+++ b/nim/flake.lock
@ -2,14 +2,18 @@
  "nodes": {
    "nixpkgs": {
      "locked": {
-        "lastModified": 1717196966,
-        "narHash": "sha256-yZKhxVIKd2lsbOqYd5iDoUIwsRZFqE87smE2Vzf6Ck0=",
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
+        "lastModified": 1689261696,
+        "narHash": "sha256-LzfUtFs9MQRvIoQ3MfgSuipBVMXslMPH/vZ+nM40LkA=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "df1eee2aa65052a18121ed4971081576b25d6b5c",
+        "type": "github"
      },
      "original": {
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
      }
    },
    "root": {
--- a/nim/flake.nix
+++ b/nim/flake.nix
@ -1,7 +1,7 @@
 {
  description = "A Nix-flake-based Nim development environment";

-  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";

  outputs = { self, nixpkgs }:
    let
--- a/nix/flake.lock
+++ b/nix/flake.lock
@ -2,14 +2,18 @@
  "nodes": {
    "nixpkgs": {
      "locked": {
-        "lastModified": 1717196966,
-        "narHash": "sha256-yZKhxVIKd2lsbOqYd5iDoUIwsRZFqE87smE2Vzf6Ck0=",
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
+        "lastModified": 1689261696,
+        "narHash": "sha256-LzfUtFs9MQRvIoQ3MfgSuipBVMXslMPH/vZ+nM40LkA=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "df1eee2aa65052a18121ed4971081576b25d6b5c",
+        "type": "github"
      },
      "original": {
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
      }
    },
    "root": {
--- a/nix/flake.nix
+++ b/nix/flake.nix
@ -1,31 +1,29 @@
 {
  description = "A Nix-flake-based Nix development environment";

-  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";

-  outputs = {
-    self,
-    nixpkgs,
-  }: let
-    supportedSystems = ["x86_64-linux" "aarch64-linux" "x86_64-darwin" "aarch64-darwin"];
-    forEachSupportedSystem = f:
-      nixpkgs.lib.genAttrs supportedSystems (system:
-        f {
-          pkgs = import nixpkgs {inherit system;};
-        });
-  in {
-    devShells = forEachSupportedSystem ({pkgs}: {
-      default = pkgs.mkShell {
-        packages = with pkgs; [
-          cachix
-          lorri
-          niv
-          alejandra
-          statix
-          vulnix
-          haskellPackages.dhall-nix
-        ];
-      };
-    });
-  };
+  outputs = { self, nixpkgs }:
+    let
+      supportedSystems = [ "x86_64-linux" "aarch64-linux" "x86_64-darwin" "aarch64-darwin" ];
+      forEachSupportedSystem = f: nixpkgs.lib.genAttrs supportedSystems (system: f {
+        pkgs = import nixpkgs { inherit system; };
+      });
+    in
+    {
+      devShells = forEachSupportedSystem ({ pkgs }: {
+        default = pkgs.mkShell {
+          packages = with pkgs; [
+            cachix
+            lorri
+            niv
+            nixfmt
+            statix
+            vulnix
+            haskellPackages.dhall-nix
+            rnix-lsp
+          ];
+        };
+      });
+    };
 }
--- a/node/flake.lock
+++ b/node/flake.lock
@ -2,14 +2,18 @@
  "nodes": {
    "nixpkgs": {
      "locked": {
-        "lastModified": 1717196966,
-        "narHash": "sha256-yZKhxVIKd2lsbOqYd5iDoUIwsRZFqE87smE2Vzf6Ck0=",
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
+        "lastModified": 1689261696,
+        "narHash": "sha256-LzfUtFs9MQRvIoQ3MfgSuipBVMXslMPH/vZ+nM40LkA=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "df1eee2aa65052a18121ed4971081576b25d6b5c",
+        "type": "github"
      },
      "original": {
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
      }
    },
    "root": {
--- a/node/flake.nix
+++ b/node/flake.nix
@ -1,13 +1,13 @@
 {
  description = "A Nix-flake-based Node.js development environment";

-  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";

  outputs = { self, nixpkgs }:
    let
      overlays = [
        (final: prev: rec {
-          nodejs = prev.nodejs_latest;
+          nodejs = prev.nodejs-18_x;
          pnpm = prev.nodePackages.pnpm;
          yarn = (prev.yarn.override { inherit nodejs; });
        })
--- a/ocaml/flake.lock
+++ b/ocaml/flake.lock
@ -2,14 +2,18 @@
  "nodes": {
    "nixpkgs": {
      "locked": {
-        "lastModified": 1717196966,
-        "narHash": "sha256-yZKhxVIKd2lsbOqYd5iDoUIwsRZFqE87smE2Vzf6Ck0=",
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
+        "lastModified": 1689261696,
+        "narHash": "sha256-LzfUtFs9MQRvIoQ3MfgSuipBVMXslMPH/vZ+nM40LkA=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "df1eee2aa65052a18121ed4971081576b25d6b5c",
+        "type": "github"
      },
      "original": {
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
      }
    },
    "root": {
--- a/ocaml/flake.nix
+++ b/ocaml/flake.nix
@ -1,7 +1,7 @@
 {
  description = "A Nix-flake-based OCaml development environment";

-  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";

  outputs = { self, nixpkgs }:
    let
--- a/opa/flake.lock
+++ b/opa/flake.lock
@ -2,14 +2,18 @@
  "nodes": {
    "nixpkgs": {
      "locked": {
-        "lastModified": 1717196966,
-        "narHash": "sha256-yZKhxVIKd2lsbOqYd5iDoUIwsRZFqE87smE2Vzf6Ck0=",
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
+        "lastModified": 1689261696,
+        "narHash": "sha256-LzfUtFs9MQRvIoQ3MfgSuipBVMXslMPH/vZ+nM40LkA=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "df1eee2aa65052a18121ed4971081576b25d6b5c",
+        "type": "github"
      },
      "original": {
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
      }
    },
    "root": {
--- a/opa/flake.nix
+++ b/opa/flake.nix
@ -1,7 +1,7 @@
 {
  description = "A Nix-flake-based Open Policy Agent development environment";

-  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";

  outputs = { self, nixpkgs }:
    let
--- a/php/flake.lock
+++ b/php/flake.lock
@ -2,14 +2,18 @@
  "nodes": {
    "nixpkgs": {
      "locked": {
-        "lastModified": 1717196966,
-        "narHash": "sha256-yZKhxVIKd2lsbOqYd5iDoUIwsRZFqE87smE2Vzf6Ck0=",
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
+        "lastModified": 1689261696,
+        "narHash": "sha256-LzfUtFs9MQRvIoQ3MfgSuipBVMXslMPH/vZ+nM40LkA=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "df1eee2aa65052a18121ed4971081576b25d6b5c",
+        "type": "github"
      },
      "original": {
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
      }
    },
    "root": {
--- a/php/flake.nix
+++ b/php/flake.nix
@ -1,7 +1,7 @@
 {
  description = "A Nix-flake-based PHP development environment";

-  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";

  outputs = { self, nixpkgs }:
    let
--- a/protobuf/flake.lock
+++ b/protobuf/flake.lock
@ -2,14 +2,18 @@
  "nodes": {
    "nixpkgs": {
      "locked": {
-        "lastModified": 1717196966,
-        "narHash": "sha256-yZKhxVIKd2lsbOqYd5iDoUIwsRZFqE87smE2Vzf6Ck0=",
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
+        "lastModified": 1689261696,
+        "narHash": "sha256-LzfUtFs9MQRvIoQ3MfgSuipBVMXslMPH/vZ+nM40LkA=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "df1eee2aa65052a18121ed4971081576b25d6b5c",
+        "type": "github"
      },
      "original": {
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
      }
    },
    "root": {
--- a/protobuf/flake.nix
+++ b/protobuf/flake.nix
@ -1,7 +1,7 @@
 {
  description = "A Nix-flake-based Protobuf development environment";

-  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";

  outputs = { self, nixpkgs }:
    let
--- a/pulumi/flake.lock
+++ b/pulumi/flake.lock
@ -2,14 +2,18 @@
  "nodes": {
    "nixpkgs": {
      "locked": {
-        "lastModified": 1717196966,
-        "narHash": "sha256-yZKhxVIKd2lsbOqYd5iDoUIwsRZFqE87smE2Vzf6Ck0=",
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
+        "lastModified": 1689261696,
+        "narHash": "sha256-LzfUtFs9MQRvIoQ3MfgSuipBVMXslMPH/vZ+nM40LkA=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "df1eee2aa65052a18121ed4971081576b25d6b5c",
+        "type": "github"
      },
      "original": {
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
      }
    },
    "root": {
--- a/pulumi/flake.nix
+++ b/pulumi/flake.nix
@ -1,7 +1,7 @@
 {
  description = "A Nix-flake-based Pulumi development environment";

-  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";

  outputs = { self, nixpkgs }:
    let
@ -25,7 +25,7 @@
            python311

            # Go SDK
-            go_1_22
+            go_1_20

            # Node.js SDK
            nodejs
--- a/purescript/flake.lock
+++ b/purescript/flake.lock
@ -3,11 +3,11 @@
    "easy-purescript-nix": {
      "flake": false,
      "locked": {
-        "lastModified": 1710161569,
-        "narHash": "sha256-lcIRIOFCdIWEGyKyG/tB4KvxM9zoWuBRDxW+T+mvIb0=",
+        "lastModified": 1686900973,
+        "narHash": "sha256-9whTjp8BYy8ZzyghhgbawS06/dVESduME3wsdNH/mpk=",
        "owner": "justinwoo",
        "repo": "easy-purescript-nix",
-        "rev": "117fd96acb69d7d1727df95b6fde9d8715e031fc",
+        "rev": "8cf400656945b2f2bacfd6a8775792aa701f60e9",
        "type": "github"
      },
      "original": {
@ -18,14 +18,18 @@
    },
    "nixpkgs": {
      "locked": {
-        "lastModified": 1717196966,
-        "narHash": "sha256-yZKhxVIKd2lsbOqYd5iDoUIwsRZFqE87smE2Vzf6Ck0=",
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
+        "lastModified": 1689261696,
+        "narHash": "sha256-LzfUtFs9MQRvIoQ3MfgSuipBVMXslMPH/vZ+nM40LkA=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "df1eee2aa65052a18121ed4971081576b25d6b5c",
+        "type": "github"
      },
      "original": {
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
      }
    },
    "root": {
--- a/purescript/flake.nix
+++ b/purescript/flake.nix
@ -2,7 +2,7 @@
  description = "A Nix-flake-based Purescript development environment";

  inputs = {
-    nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
+    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
    easy-purescript-nix = {
      url = "github:justinwoo/easy-purescript-nix";
      flake = false;
--- a/python/flake.lock
+++ b/python/flake.lock
@ -2,14 +2,18 @@
  "nodes": {
    "nixpkgs": {
      "locked": {
-        "lastModified": 1717196966,
-        "narHash": "sha256-yZKhxVIKd2lsbOqYd5iDoUIwsRZFqE87smE2Vzf6Ck0=",
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
+        "lastModified": 1689261696,
+        "narHash": "sha256-LzfUtFs9MQRvIoQ3MfgSuipBVMXslMPH/vZ+nM40LkA=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "df1eee2aa65052a18121ed4971081576b25d6b5c",
+        "type": "github"
      },
      "original": {
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
      }
    },
    "root": {
--- a/python/flake.nix
+++ b/python/flake.nix
@ -1,29 +1,21 @@
 {
  description = "A Nix-flake-based Python development environment";

-  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";

-  outputs = {
-    self,
-    nixpkgs,
-  }: let
-    supportedSystems = ["x86_64-linux" "aarch64-linux" "x86_64-darwin" "aarch64-darwin"];
-    forEachSupportedSystem = f:
-      nixpkgs.lib.genAttrs supportedSystems (system:
-        f {
-          pkgs = import nixpkgs {inherit system;};
-        });
-  in {
-    devShells = forEachSupportedSystem ({pkgs}: {
-      default = pkgs.mkShell {
-        packages = with pkgs;
-          [python311]
-          ++ (with pkgs.python311Packages; [
-            pip
-            python-lsp-server
-            python-lsp-ruff
-          ]);
-      };
-    });
-  };
+  outputs = { self, nixpkgs }:
+    let
+      supportedSystems = [ "x86_64-linux" "aarch64-linux" "x86_64-darwin" "aarch64-darwin" ];
+      forEachSupportedSystem = f: nixpkgs.lib.genAttrs supportedSystems (system: f {
+        pkgs = import nixpkgs { inherit system; };
+      });
+    in
+    {
+      devShells = forEachSupportedSystem ({ pkgs }: {
+        default = pkgs.mkShell {
+          packages = with pkgs; [ python311 virtualenv ] ++
+            (with pkgs.python311Packages; [ pip ]);
+        };
+      });
+    };
 }
--- a/python/justfile
+++ b/python/justfile
@ -1,14 +0,0 @@
-build:
-    python main.py
-
-test:
-    pytest test.py
-
-run:
-    python main.py
-
-jupyter:
-    cat | zsh ~/.config/helix/run_jupyter_from_helix.zsh python
-
-send:
-    python -c 'import sys, textwrap; sys.stdout.write(textwrap.dedent(sys.stdin.read()))' | jupyter run --existing="/tmp/rjh-$(pwd).json"
--- a/ruby/flake.lock
+++ b/ruby/flake.lock
@ -2,14 +2,18 @@
  "nodes": {
    "nixpkgs": {
      "locked": {
-        "lastModified": 1717196966,
-        "narHash": "sha256-yZKhxVIKd2lsbOqYd5iDoUIwsRZFqE87smE2Vzf6Ck0=",
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
+        "lastModified": 1689261696,
+        "narHash": "sha256-LzfUtFs9MQRvIoQ3MfgSuipBVMXslMPH/vZ+nM40LkA=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "df1eee2aa65052a18121ed4971081576b25d6b5c",
+        "type": "github"
      },
      "original": {
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
      }
    },
    "root": {
--- a/ruby/flake.nix
+++ b/ruby/flake.nix
@ -1,7 +1,7 @@
 {
  description = "A Nix-flake-based Ruby development environment";

-  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";

  outputs = { self, nixpkgs }:
    let
--- a/rust-toolchain/flake.lock
+++ b/rust-toolchain/flake.lock
@ -5,11 +5,11 @@
        "systems": "systems"
      },
      "locked": {
-        "lastModified": 1705309234,
-        "narHash": "sha256-uNRRNRKmJyCRC/8y1RqBkqWBLM034y4qN7EprSdmgyA=",
+        "lastModified": 1681202837,
+        "narHash": "sha256-H+Rh19JDwRtpVPAWp64F+rlEtxUWBAQW28eAi3SRSzg=",
        "owner": "numtide",
        "repo": "flake-utils",
-        "rev": "1ef2e671c3b0c19053962c07dbda38332dcebf26",
+        "rev": "cfacdce06f30d2b68473a46042957675eebb3401",
        "type": "github"
      },
      "original": {
@ -20,14 +20,34 @@
    },
    "nixpkgs": {
      "locked": {
-        "lastModified": 1717196966,
-        "narHash": "sha256-yZKhxVIKd2lsbOqYd5iDoUIwsRZFqE87smE2Vzf6Ck0=",
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
+        "lastModified": 1689261696,
+        "narHash": "sha256-LzfUtFs9MQRvIoQ3MfgSuipBVMXslMPH/vZ+nM40LkA=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "df1eee2aa65052a18121ed4971081576b25d6b5c",
+        "type": "github"
      },
      "original": {
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs_2": {
+      "locked": {
+        "lastModified": 1681358109,
+        "narHash": "sha256-eKyxW4OohHQx9Urxi7TQlFBTDWII+F+x2hklDOQPB50=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "96ba1c52e54e74c3197f4d43026b3f3d92e83ff9",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
      }
    },
    "root": {
@ -39,16 +59,14 @@
    "rust-overlay": {
      "inputs": {
        "flake-utils": "flake-utils",
-        "nixpkgs": [
-          "nixpkgs"
-        ]
+        "nixpkgs": "nixpkgs_2"
      },
      "locked": {
-        "lastModified": 1717467480,
-        "narHash": "sha256-9Fbar+ycxdfZ6HbwOCgD+jWG3du/12TFisKRQm4Zhfc=",
+        "lastModified": 1689302058,
+        "narHash": "sha256-yD74lcHTrw4niXcE9goJLbzsgyce48rQQoy5jK5ZK40=",
        "owner": "oxalica",
        "repo": "rust-overlay",
-        "rev": "260ff391290a2b23958d04db0d3e7015c8417401",
+        "rev": "7b8dbbf4c67ed05a9bf3d9e658c12d4108bc24c8",
        "type": "github"
      },
      "original": {
--- a/rust-toolchain/flake.nix
+++ b/rust-toolchain/flake.nix
@ -2,11 +2,8 @@
  description = "A Nix-flake-based Rust development environment";

  inputs = {
-    nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
-    rust-overlay = {
-      url = "github:oxalica/rust-overlay";
-      inputs.nixpkgs.follows = "nixpkgs";
-    };
+    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+    rust-overlay.url = "github:oxalica/rust-overlay";
  };

  outputs = { self, nixpkgs, rust-overlay }:
--- a/rust/flake.lock
+++ b/rust/flake.lock
@ -5,11 +5,11 @@
        "systems": "systems"
      },
      "locked": {
-        "lastModified": 1705309234,
-        "narHash": "sha256-uNRRNRKmJyCRC/8y1RqBkqWBLM034y4qN7EprSdmgyA=",
+        "lastModified": 1681202837,
+        "narHash": "sha256-H+Rh19JDwRtpVPAWp64F+rlEtxUWBAQW28eAi3SRSzg=",
        "owner": "numtide",
        "repo": "flake-utils",
-        "rev": "1ef2e671c3b0c19053962c07dbda38332dcebf26",
+        "rev": "cfacdce06f30d2b68473a46042957675eebb3401",
        "type": "github"
      },
      "original": {
@ -20,14 +20,34 @@
    },
    "nixpkgs": {
      "locked": {
-        "lastModified": 1717196966,
-        "narHash": "sha256-yZKhxVIKd2lsbOqYd5iDoUIwsRZFqE87smE2Vzf6Ck0=",
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
+        "lastModified": 1689261696,
+        "narHash": "sha256-LzfUtFs9MQRvIoQ3MfgSuipBVMXslMPH/vZ+nM40LkA=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "df1eee2aa65052a18121ed4971081576b25d6b5c",
+        "type": "github"
      },
      "original": {
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs_2": {
+      "locked": {
+        "lastModified": 1681358109,
+        "narHash": "sha256-eKyxW4OohHQx9Urxi7TQlFBTDWII+F+x2hklDOQPB50=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "96ba1c52e54e74c3197f4d43026b3f3d92e83ff9",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
      }
    },
    "root": {
@ -39,16 +59,14 @@
    "rust-overlay": {
      "inputs": {
        "flake-utils": "flake-utils",
-        "nixpkgs": [
-          "nixpkgs"
-        ]
+        "nixpkgs": "nixpkgs_2"
      },
      "locked": {
-        "lastModified": 1717467480,
-        "narHash": "sha256-9Fbar+ycxdfZ6HbwOCgD+jWG3du/12TFisKRQm4Zhfc=",
+        "lastModified": 1689302058,
+        "narHash": "sha256-yD74lcHTrw4niXcE9goJLbzsgyce48rQQoy5jK5ZK40=",
        "owner": "oxalica",
        "repo": "rust-overlay",
-        "rev": "260ff391290a2b23958d04db0d3e7015c8417401",
+        "rev": "7b8dbbf4c67ed05a9bf3d9e658c12d4108bc24c8",
        "type": "github"
      },
      "original": {
--- a/rust/flake.nix
+++ b/rust/flake.nix
@ -2,11 +2,8 @@
  description = "A Nix-flake-based Rust development environment";

  inputs = {
-    nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
-    rust-overlay = {
-      url = "github:oxalica/rust-overlay";
-      inputs.nixpkgs.follows = "nixpkgs";
-    };
+    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+    rust-overlay.url = "github:oxalica/rust-overlay";
  };

  outputs = { self, nixpkgs, rust-overlay }:
@ -23,9 +20,7 @@
            else if builtins.pathExists ./rust-toolchain then
              rust.fromRustupToolchainFile ./rust-toolchain
            else
-              rust.stable.latest.default.override {
-                extensions = [ "rust-src" "rustfmt" ];
-              };
+              rust.stable.latest.default;
        })
      ];
      supportedSystems = [ "x86_64-linux" "aarch64-linux" "x86_64-darwin" "aarch64-darwin" ];
--- a/rust/justfile
+++ b/rust/justfile
@ -1,8 +0,0 @@
-build:
-    cargo build
-
-test:
-    cargo test
-
-run:
-    cargo run
--- a/rustpython/.envrc
+++ b/rustpython/.envrc
@ -1 +0,0 @@
-use flake
--- a/rustpython/flake.lock
+++ b/rustpython/flake.lock
@ -1,78 +0,0 @@
-{
-  "nodes": {
-    "flake-utils": {
-      "inputs": {
-        "systems": "systems"
-      },
-      "locked": {
-        "lastModified": 1705309234,
-        "narHash": "sha256-uNRRNRKmJyCRC/8y1RqBkqWBLM034y4qN7EprSdmgyA=",
-        "owner": "numtide",
-        "repo": "flake-utils",
-        "rev": "1ef2e671c3b0c19053962c07dbda38332dcebf26",
-        "type": "github"
-      },
-      "original": {
-        "owner": "numtide",
-        "repo": "flake-utils",
-        "type": "github"
-      }
-    },
-    "nixpkgs": {
-      "locked": {
-        "lastModified": 1717196966,
-        "narHash": "sha256-yZKhxVIKd2lsbOqYd5iDoUIwsRZFqE87smE2Vzf6Ck0=",
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
-      },
-      "original": {
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
-      }
-    },
-    "root": {
-      "inputs": {
-        "nixpkgs": "nixpkgs",
-        "rust-overlay": "rust-overlay"
-      }
-    },
-    "rust-overlay": {
-      "inputs": {
-        "flake-utils": "flake-utils",
-        "nixpkgs": [
-          "nixpkgs"
-        ]
-      },
-      "locked": {
-        "lastModified": 1717467480,
-        "narHash": "sha256-9Fbar+ycxdfZ6HbwOCgD+jWG3du/12TFisKRQm4Zhfc=",
-        "owner": "oxalica",
-        "repo": "rust-overlay",
-        "rev": "260ff391290a2b23958d04db0d3e7015c8417401",
-        "type": "github"
-      },
-      "original": {
-        "owner": "oxalica",
-        "repo": "rust-overlay",
-        "type": "github"
-      }
-    },
-    "systems": {
-      "locked": {
-        "lastModified": 1681028828,
-        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
-        "owner": "nix-systems",
-        "repo": "default",
-        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nix-systems",
-        "repo": "default",
-        "type": "github"
-      }
-    }
-  },
-  "root": "root",
-  "version": 7
-}
--- a/rustpython/flake.nix
+++ b/rustpython/flake.nix
@ -1,48 +0,0 @@
-{
-  description = "A Nix-flake-based Rust development environment";
-
-  inputs = {
-    nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
-    rust-overlay = {
-      url = "github:oxalica/rust-overlay";
-      inputs.nixpkgs.follows = "nixpkgs";
-    };
-  };
-
-  outputs =
-    { self
-    , nixpkgs
-    , rust-overlay
-    ,
-    }:
-    let
-      overlays = [
-        rust-overlay.overlays.default
-        (final: prev: {
-          rustToolchain = prev.rust-bin.fromRustupToolchainFile ./rust-toolchain.toml;
-        })
-      ];
-      supportedSystems = [ "x86_64-linux" "aarch64-linux" "x86_64-darwin" "aarch64-darwin" ];
-      forEachSupportedSystem = f:
-        nixpkgs.lib.genAttrs supportedSystems (system:
-          f {
-            pkgs = import nixpkgs { inherit overlays system; };
-          });
-    in
-    {
-      devShells = forEachSupportedSystem ({ pkgs }: {
-        default = pkgs.mkShell {
-          packages = with pkgs; [
-            rustToolchain
-            openssl
-            pkg-config
-            cargo-deny
-            cargo-edit
-            cargo-watch
-            rust-analyzer
-            rustpython
-          ];
-        };
-      });
-    };
-}
--- a/rustpython/rust-toolchain.toml
+++ b/rustpython/rust-toolchain.toml
@ -1,2 +0,0 @@
-[toolchain]
-channel = "1.69.0"
--- a/scala/flake.lock
+++ b/scala/flake.lock
@ -2,14 +2,18 @@
  "nodes": {
    "nixpkgs": {
      "locked": {
-        "lastModified": 1717196966,
-        "narHash": "sha256-yZKhxVIKd2lsbOqYd5iDoUIwsRZFqE87smE2Vzf6Ck0=",
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
+        "lastModified": 1689261696,
+        "narHash": "sha256-LzfUtFs9MQRvIoQ3MfgSuipBVMXslMPH/vZ+nM40LkA=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "df1eee2aa65052a18121ed4971081576b25d6b5c",
+        "type": "github"
      },
      "original": {
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
      }
    },
    "root": {
--- a/scala/flake.nix
+++ b/scala/flake.nix
@ -1,7 +1,7 @@
 {
  description = "A Nix-flake-based Scala development environment";

-  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";

  outputs = { self, nixpkgs }:
    let
--- a/shell/flake.lock
+++ b/shell/flake.lock
@ -2,14 +2,18 @@
  "nodes": {
    "nixpkgs": {
      "locked": {
-        "lastModified": 1717196966,
-        "narHash": "sha256-yZKhxVIKd2lsbOqYd5iDoUIwsRZFqE87smE2Vzf6Ck0=",
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
+        "lastModified": 1689261696,
+        "narHash": "sha256-LzfUtFs9MQRvIoQ3MfgSuipBVMXslMPH/vZ+nM40LkA=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "df1eee2aa65052a18121ed4971081576b25d6b5c",
+        "type": "github"
      },
      "original": {
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
      }
    },
    "root": {
--- a/shell/flake.nix
+++ b/shell/flake.nix
@ -1,7 +1,7 @@
 {
  description = "A Nix-flake-based Shell development environment";

-  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";

  outputs = { self, nixpkgs }:
    let
--- a/vlang/flake.lock
+++ b/vlang/flake.lock
@ -1,23 +0,0 @@
-{
-  "nodes": {
-    "nixpkgs": {
-      "locked": {
-        "lastModified": 1717196966,
-        "narHash": "sha256-yZKhxVIKd2lsbOqYd5iDoUIwsRZFqE87smE2Vzf6Ck0=",
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
-      },
-      "original": {
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
-      }
-    },
-    "root": {
-      "inputs": {
-        "nixpkgs": "nixpkgs"
-      }
-    }
-  },
-  "root": "root",
-  "version": 7
-}
--- a/vlang/flake.nix
+++ b/vlang/flake.nix
@ -1,22 +0,0 @@
-{
-  description = "A Nix-flake-based Vlang development environment";
-
-  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
-
-  outputs = { self, nixpkgs }:
-    let
-      supportedSystems = [ "x86_64-linux" "aarch64-linux" "x86_64-darwin" "aarch64-darwin" ];
-      forEachSupportedSystem = f: nixpkgs.lib.genAttrs supportedSystems (system: f {
-        pkgs = import nixpkgs { inherit system; };
-      });
-    in
-    {
-      devShells = forEachSupportedSystem ({ pkgs }: {
-        default = pkgs.mkShell {
-          packages = with pkgs; [
-            vlang
-          ];
-        };
-      });
-    };
-}
--- a/zig/flake.lock
+++ b/zig/flake.lock
@ -2,14 +2,18 @@
  "nodes": {
    "nixpkgs": {
      "locked": {
-        "lastModified": 1717196966,
-        "narHash": "sha256-yZKhxVIKd2lsbOqYd5iDoUIwsRZFqE87smE2Vzf6Ck0=",
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
+        "lastModified": 1689261696,
+        "narHash": "sha256-LzfUtFs9MQRvIoQ3MfgSuipBVMXslMPH/vZ+nM40LkA=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "df1eee2aa65052a18121ed4971081576b25d6b5c",
+        "type": "github"
      },
      "original": {
-        "type": "tarball",
-        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
      }
    },
    "root": {
--- a/zig/flake.nix
+++ b/zig/flake.nix
@ -1,7 +1,7 @@
 {
  description = "A Nix-flake-based Zig development environment";

-  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";

  outputs = { self, nixpkgs }:
    let