diff --git a/clojure/flake.lock b/clojure/flake.lock
index 0f56f8b..d4ecad3 100644
--- a/clojure/flake.lock
+++ b/clojure/flake.lock
@@ -2,18 +2,16 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1689261696,
-        "narHash": "sha256-LzfUtFs9MQRvIoQ3MfgSuipBVMXslMPH/vZ+nM40LkA=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "df1eee2aa65052a18121ed4971081576b25d6b5c",
-        "type": "github"
+        "lastModified": 1703013332,
+        "narHash": "sha256-+tFNwMvlXLbJZXiMHqYq77z/RfmpfpiI3yjL6o/Zo9M=",
+        "rev": "54aac082a4d9bb5bbc5c4e899603abfb76a3f6d6",
+        "revCount": 561409,
+        "type": "tarball",
+        "url": "https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.1.561409%2Brev-54aac082a4d9bb5bbc5c4e899603abfb76a3f6d6/018c8732-ea5c-725f-a6c9-9ed48683aa5a/source.tar.gz"
       },
       "original": {
-        "owner": "NixOS",
-        "ref": "nixpkgs-unstable",
-        "repo": "nixpkgs",
-        "type": "github"
+        "type": "tarball",
+        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
       }
     },
     "root": {
diff --git a/clojure/flake.nix b/clojure/flake.nix
index 3019144..387fdbb 100644
--- a/clojure/flake.nix
+++ b/clojure/flake.nix
@@ -1,7 +1,7 @@
 {
   description = "A Nix-flake-based Clojure development environment";
 
-  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
 
   outputs = { self, nixpkgs }:
 
diff --git a/csharp/flake.lock b/csharp/flake.lock
index 0f56f8b..d4ecad3 100644
--- a/csharp/flake.lock
+++ b/csharp/flake.lock
@@ -2,18 +2,16 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1689261696,
-        "narHash": "sha256-LzfUtFs9MQRvIoQ3MfgSuipBVMXslMPH/vZ+nM40LkA=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "df1eee2aa65052a18121ed4971081576b25d6b5c",
-        "type": "github"
+        "lastModified": 1703013332,
+        "narHash": "sha256-+tFNwMvlXLbJZXiMHqYq77z/RfmpfpiI3yjL6o/Zo9M=",
+        "rev": "54aac082a4d9bb5bbc5c4e899603abfb76a3f6d6",
+        "revCount": 561409,
+        "type": "tarball",
+        "url": "https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.1.561409%2Brev-54aac082a4d9bb5bbc5c4e899603abfb76a3f6d6/018c8732-ea5c-725f-a6c9-9ed48683aa5a/source.tar.gz"
       },
       "original": {
-        "owner": "NixOS",
-        "ref": "nixpkgs-unstable",
-        "repo": "nixpkgs",
-        "type": "github"
+        "type": "tarball",
+        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
       }
     },
     "root": {
diff --git a/csharp/flake.nix b/csharp/flake.nix
index 231a6c4..9a7037c 100644
--- a/csharp/flake.nix
+++ b/csharp/flake.nix
@@ -1,7 +1,7 @@
 {
   description = "A Nix-flake-based C# development environment";
 
-  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
 
   outputs = { self, nixpkgs }:
     let
diff --git a/cue/flake.lock b/cue/flake.lock
index 0f56f8b..d4ecad3 100644
--- a/cue/flake.lock
+++ b/cue/flake.lock
@@ -2,18 +2,16 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1689261696,
-        "narHash": "sha256-LzfUtFs9MQRvIoQ3MfgSuipBVMXslMPH/vZ+nM40LkA=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "df1eee2aa65052a18121ed4971081576b25d6b5c",
-        "type": "github"
+        "lastModified": 1703013332,
+        "narHash": "sha256-+tFNwMvlXLbJZXiMHqYq77z/RfmpfpiI3yjL6o/Zo9M=",
+        "rev": "54aac082a4d9bb5bbc5c4e899603abfb76a3f6d6",
+        "revCount": 561409,
+        "type": "tarball",
+        "url": "https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.1.561409%2Brev-54aac082a4d9bb5bbc5c4e899603abfb76a3f6d6/018c8732-ea5c-725f-a6c9-9ed48683aa5a/source.tar.gz"
       },
       "original": {
-        "owner": "NixOS",
-        "ref": "nixpkgs-unstable",
-        "repo": "nixpkgs",
-        "type": "github"
+        "type": "tarball",
+        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
       }
     },
     "root": {
diff --git a/cue/flake.nix b/cue/flake.nix
index e2b0d9c..50543e2 100644
--- a/cue/flake.nix
+++ b/cue/flake.nix
@@ -1,7 +1,7 @@
 {
   description = "A Nix-flake-based Cue development environment";
 
-  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
 
   outputs = { self, nixpkgs }:
 
diff --git a/dhall/flake.lock b/dhall/flake.lock
index 0f56f8b..d4ecad3 100644
--- a/dhall/flake.lock
+++ b/dhall/flake.lock
@@ -2,18 +2,16 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1689261696,
-        "narHash": "sha256-LzfUtFs9MQRvIoQ3MfgSuipBVMXslMPH/vZ+nM40LkA=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "df1eee2aa65052a18121ed4971081576b25d6b5c",
-        "type": "github"
+        "lastModified": 1703013332,
+        "narHash": "sha256-+tFNwMvlXLbJZXiMHqYq77z/RfmpfpiI3yjL6o/Zo9M=",
+        "rev": "54aac082a4d9bb5bbc5c4e899603abfb76a3f6d6",
+        "revCount": 561409,
+        "type": "tarball",
+        "url": "https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.1.561409%2Brev-54aac082a4d9bb5bbc5c4e899603abfb76a3f6d6/018c8732-ea5c-725f-a6c9-9ed48683aa5a/source.tar.gz"
       },
       "original": {
-        "owner": "NixOS",
-        "ref": "nixpkgs-unstable",
-        "repo": "nixpkgs",
-        "type": "github"
+        "type": "tarball",
+        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
       }
     },
     "root": {
diff --git a/dhall/flake.nix b/dhall/flake.nix
index b8de714..16aeaf0 100644
--- a/dhall/flake.nix
+++ b/dhall/flake.nix
@@ -1,7 +1,7 @@
 {
   description = "A Nix-flake-based Dhall development environment";
 
-  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
 
   outputs = { self, nixpkgs }:
     let
diff --git a/elixir/flake.lock b/elixir/flake.lock
index 0f56f8b..d4ecad3 100644
--- a/elixir/flake.lock
+++ b/elixir/flake.lock
@@ -2,18 +2,16 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1689261696,
-        "narHash": "sha256-LzfUtFs9MQRvIoQ3MfgSuipBVMXslMPH/vZ+nM40LkA=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "df1eee2aa65052a18121ed4971081576b25d6b5c",
-        "type": "github"
+        "lastModified": 1703013332,
+        "narHash": "sha256-+tFNwMvlXLbJZXiMHqYq77z/RfmpfpiI3yjL6o/Zo9M=",
+        "rev": "54aac082a4d9bb5bbc5c4e899603abfb76a3f6d6",
+        "revCount": 561409,
+        "type": "tarball",
+        "url": "https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.1.561409%2Brev-54aac082a4d9bb5bbc5c4e899603abfb76a3f6d6/018c8732-ea5c-725f-a6c9-9ed48683aa5a/source.tar.gz"
       },
       "original": {
-        "owner": "NixOS",
-        "ref": "nixpkgs-unstable",
-        "repo": "nixpkgs",
-        "type": "github"
+        "type": "tarball",
+        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
       }
     },
     "root": {
diff --git a/elixir/flake.nix b/elixir/flake.nix
index 110793a..f83f706 100644
--- a/elixir/flake.nix
+++ b/elixir/flake.nix
@@ -1,7 +1,7 @@
 {
   description = "A Nix-flake-based Elixir development environment";
 
-  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
 
   outputs = { self, nixpkgs }:
     let
diff --git a/elm/flake.lock b/elm/flake.lock
index 0f56f8b..d4ecad3 100644
--- a/elm/flake.lock
+++ b/elm/flake.lock
@@ -2,18 +2,16 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1689261696,
-        "narHash": "sha256-LzfUtFs9MQRvIoQ3MfgSuipBVMXslMPH/vZ+nM40LkA=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "df1eee2aa65052a18121ed4971081576b25d6b5c",
-        "type": "github"
+        "lastModified": 1703013332,
+        "narHash": "sha256-+tFNwMvlXLbJZXiMHqYq77z/RfmpfpiI3yjL6o/Zo9M=",
+        "rev": "54aac082a4d9bb5bbc5c4e899603abfb76a3f6d6",
+        "revCount": 561409,
+        "type": "tarball",
+        "url": "https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.1.561409%2Brev-54aac082a4d9bb5bbc5c4e899603abfb76a3f6d6/018c8732-ea5c-725f-a6c9-9ed48683aa5a/source.tar.gz"
       },
       "original": {
-        "owner": "NixOS",
-        "ref": "nixpkgs-unstable",
-        "repo": "nixpkgs",
-        "type": "github"
+        "type": "tarball",
+        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
       }
     },
     "root": {
diff --git a/elm/flake.nix b/elm/flake.nix
index 72897b7..0967a47 100644
--- a/elm/flake.nix
+++ b/elm/flake.nix
@@ -1,7 +1,7 @@
 {
   description = "A Nix-flake-based Elm development environment";
 
-  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
 
   outputs = { self, nixpkgs }:
     let
diff --git a/gleam/flake.lock b/gleam/flake.lock
index 0f56f8b..d4ecad3 100644
--- a/gleam/flake.lock
+++ b/gleam/flake.lock
@@ -2,18 +2,16 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1689261696,
-        "narHash": "sha256-LzfUtFs9MQRvIoQ3MfgSuipBVMXslMPH/vZ+nM40LkA=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "df1eee2aa65052a18121ed4971081576b25d6b5c",
-        "type": "github"
+        "lastModified": 1703013332,
+        "narHash": "sha256-+tFNwMvlXLbJZXiMHqYq77z/RfmpfpiI3yjL6o/Zo9M=",
+        "rev": "54aac082a4d9bb5bbc5c4e899603abfb76a3f6d6",
+        "revCount": 561409,
+        "type": "tarball",
+        "url": "https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.1.561409%2Brev-54aac082a4d9bb5bbc5c4e899603abfb76a3f6d6/018c8732-ea5c-725f-a6c9-9ed48683aa5a/source.tar.gz"
       },
       "original": {
-        "owner": "NixOS",
-        "ref": "nixpkgs-unstable",
-        "repo": "nixpkgs",
-        "type": "github"
+        "type": "tarball",
+        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
       }
     },
     "root": {
diff --git a/gleam/flake.nix b/gleam/flake.nix
index 9b7ce64..1c463f8 100644
--- a/gleam/flake.nix
+++ b/gleam/flake.nix
@@ -1,7 +1,7 @@
 {
   description = "A Nix-flake-based Gleam development environment";
 
-  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
 
   outputs = { self, nixpkgs }:
     let
diff --git a/go/flake.lock b/go/flake.lock
index 0f56f8b..d4ecad3 100644
--- a/go/flake.lock
+++ b/go/flake.lock
@@ -2,18 +2,16 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1689261696,
-        "narHash": "sha256-LzfUtFs9MQRvIoQ3MfgSuipBVMXslMPH/vZ+nM40LkA=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "df1eee2aa65052a18121ed4971081576b25d6b5c",
-        "type": "github"
+        "lastModified": 1703013332,
+        "narHash": "sha256-+tFNwMvlXLbJZXiMHqYq77z/RfmpfpiI3yjL6o/Zo9M=",
+        "rev": "54aac082a4d9bb5bbc5c4e899603abfb76a3f6d6",
+        "revCount": 561409,
+        "type": "tarball",
+        "url": "https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.1.561409%2Brev-54aac082a4d9bb5bbc5c4e899603abfb76a3f6d6/018c8732-ea5c-725f-a6c9-9ed48683aa5a/source.tar.gz"
       },
       "original": {
-        "owner": "NixOS",
-        "ref": "nixpkgs-unstable",
-        "repo": "nixpkgs",
-        "type": "github"
+        "type": "tarball",
+        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
       }
     },
     "root": {
diff --git a/go/flake.nix b/go/flake.nix
index 0304784..c5b652d 100644
--- a/go/flake.nix
+++ b/go/flake.nix
@@ -1,7 +1,7 @@
 {
   description = "A Nix-flake-based Go 1.17 development environment";
 
-  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
 
   outputs = { self, nixpkgs }:
     let
diff --git a/hashi/flake.lock b/hashi/flake.lock
index 80f0d19..d4ecad3 100644
--- a/hashi/flake.lock
+++ b/hashi/flake.lock
@@ -2,18 +2,16 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1689209875,
-        "narHash": "sha256-8AVcBV1DiszaZzHFd5iLc8HSLfxRAuqcU0QdfBEF3Ag=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "fcc147b1e9358a8386b2c4368bd928e1f63a7df2",
-        "type": "github"
+        "lastModified": 1703013332,
+        "narHash": "sha256-+tFNwMvlXLbJZXiMHqYq77z/RfmpfpiI3yjL6o/Zo9M=",
+        "rev": "54aac082a4d9bb5bbc5c4e899603abfb76a3f6d6",
+        "revCount": 561409,
+        "type": "tarball",
+        "url": "https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.1.561409%2Brev-54aac082a4d9bb5bbc5c4e899603abfb76a3f6d6/018c8732-ea5c-725f-a6c9-9ed48683aa5a/source.tar.gz"
       },
       "original": {
-        "owner": "NixOS",
-        "ref": "nixos-23.05",
-        "repo": "nixpkgs",
-        "type": "github"
+        "type": "tarball",
+        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
       }
     },
     "root": {
diff --git a/hashi/flake.nix b/hashi/flake.nix
index dbcc490..35004bd 100644
--- 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 = "github:NixOS/nixpkgs/nixos-23.05";
+  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; };
+        pkgs = import nixpkgs { inherit system; config.allowUnfree = true; };
       });
     in
     {
diff --git a/haskell/flake.lock b/haskell/flake.lock
index 0f56f8b..d4ecad3 100644
--- a/haskell/flake.lock
+++ b/haskell/flake.lock
@@ -2,18 +2,16 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1689261696,
-        "narHash": "sha256-LzfUtFs9MQRvIoQ3MfgSuipBVMXslMPH/vZ+nM40LkA=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "df1eee2aa65052a18121ed4971081576b25d6b5c",
-        "type": "github"
+        "lastModified": 1703013332,
+        "narHash": "sha256-+tFNwMvlXLbJZXiMHqYq77z/RfmpfpiI3yjL6o/Zo9M=",
+        "rev": "54aac082a4d9bb5bbc5c4e899603abfb76a3f6d6",
+        "revCount": 561409,
+        "type": "tarball",
+        "url": "https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.1.561409%2Brev-54aac082a4d9bb5bbc5c4e899603abfb76a3f6d6/018c8732-ea5c-725f-a6c9-9ed48683aa5a/source.tar.gz"
       },
       "original": {
-        "owner": "NixOS",
-        "ref": "nixpkgs-unstable",
-        "repo": "nixpkgs",
-        "type": "github"
+        "type": "tarball",
+        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
       }
     },
     "root": {
diff --git a/haskell/flake.nix b/haskell/flake.nix
index 84fd566..e65fe4e 100644
--- a/haskell/flake.nix
+++ b/haskell/flake.nix
@@ -1,7 +1,7 @@
 {
   description = "A Nix-flake-based Haskell development environment";
 
-  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
 
   outputs = { self, nixpkgs }:
     let
diff --git a/java/flake.lock b/java/flake.lock
index 0f56f8b..d4ecad3 100644
--- a/java/flake.lock
+++ b/java/flake.lock
@@ -2,18 +2,16 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1689261696,
-        "narHash": "sha256-LzfUtFs9MQRvIoQ3MfgSuipBVMXslMPH/vZ+nM40LkA=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "df1eee2aa65052a18121ed4971081576b25d6b5c",
-        "type": "github"
+        "lastModified": 1703013332,
+        "narHash": "sha256-+tFNwMvlXLbJZXiMHqYq77z/RfmpfpiI3yjL6o/Zo9M=",
+        "rev": "54aac082a4d9bb5bbc5c4e899603abfb76a3f6d6",
+        "revCount": 561409,
+        "type": "tarball",
+        "url": "https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.1.561409%2Brev-54aac082a4d9bb5bbc5c4e899603abfb76a3f6d6/018c8732-ea5c-725f-a6c9-9ed48683aa5a/source.tar.gz"
       },
       "original": {
-        "owner": "NixOS",
-        "ref": "nixpkgs-unstable",
-        "repo": "nixpkgs",
-        "type": "github"
+        "type": "tarball",
+        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
       }
     },
     "root": {
diff --git a/java/flake.nix b/java/flake.nix
index 5e5dd30..42b6255 100644
--- a/java/flake.nix
+++ b/java/flake.nix
@@ -1,7 +1,7 @@
 {
   description = "A Nix-flake-based Java development environment";
 
-  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
 
   outputs = { self, nixpkgs }:
     let
diff --git a/kotlin/flake.lock b/kotlin/flake.lock
index 0f56f8b..d4ecad3 100644
--- a/kotlin/flake.lock
+++ b/kotlin/flake.lock
@@ -2,18 +2,16 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1689261696,
-        "narHash": "sha256-LzfUtFs9MQRvIoQ3MfgSuipBVMXslMPH/vZ+nM40LkA=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "df1eee2aa65052a18121ed4971081576b25d6b5c",
-        "type": "github"
+        "lastModified": 1703013332,
+        "narHash": "sha256-+tFNwMvlXLbJZXiMHqYq77z/RfmpfpiI3yjL6o/Zo9M=",
+        "rev": "54aac082a4d9bb5bbc5c4e899603abfb76a3f6d6",
+        "revCount": 561409,
+        "type": "tarball",
+        "url": "https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.1.561409%2Brev-54aac082a4d9bb5bbc5c4e899603abfb76a3f6d6/018c8732-ea5c-725f-a6c9-9ed48683aa5a/source.tar.gz"
       },
       "original": {
-        "owner": "NixOS",
-        "ref": "nixpkgs-unstable",
-        "repo": "nixpkgs",
-        "type": "github"
+        "type": "tarball",
+        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
       }
     },
     "root": {
diff --git a/kotlin/flake.nix b/kotlin/flake.nix
index df8b79b..6885ea0 100644
--- a/kotlin/flake.nix
+++ b/kotlin/flake.nix
@@ -1,7 +1,7 @@
 {
   description = "A Nix-flake-based Kotlin development environment";
 
-  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
 
   outputs = { self, nixpkgs }:
     let
diff --git a/latex/flake.lock b/latex/flake.lock
index 0f56f8b..d4ecad3 100644
--- a/latex/flake.lock
+++ b/latex/flake.lock
@@ -2,18 +2,16 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1689261696,
-        "narHash": "sha256-LzfUtFs9MQRvIoQ3MfgSuipBVMXslMPH/vZ+nM40LkA=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "df1eee2aa65052a18121ed4971081576b25d6b5c",
-        "type": "github"
+        "lastModified": 1703013332,
+        "narHash": "sha256-+tFNwMvlXLbJZXiMHqYq77z/RfmpfpiI3yjL6o/Zo9M=",
+        "rev": "54aac082a4d9bb5bbc5c4e899603abfb76a3f6d6",
+        "revCount": 561409,
+        "type": "tarball",
+        "url": "https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.1.561409%2Brev-54aac082a4d9bb5bbc5c4e899603abfb76a3f6d6/018c8732-ea5c-725f-a6c9-9ed48683aa5a/source.tar.gz"
       },
       "original": {
-        "owner": "NixOS",
-        "ref": "nixpkgs-unstable",
-        "repo": "nixpkgs",
-        "type": "github"
+        "type": "tarball",
+        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
       }
     },
     "root": {
diff --git a/latex/flake.nix b/latex/flake.nix
index a7291ee..237f977 100644
--- a/latex/flake.nix
+++ b/latex/flake.nix
@@ -1,7 +1,7 @@
 {
   description = "A Nix-flake-based LaTeX development environment";
 
-  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
 
   outputs = { self, nixpkgs }:
     let
diff --git a/nickel/flake.lock b/nickel/flake.lock
index 0f56f8b..d4ecad3 100644
--- a/nickel/flake.lock
+++ b/nickel/flake.lock
@@ -2,18 +2,16 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1689261696,
-        "narHash": "sha256-LzfUtFs9MQRvIoQ3MfgSuipBVMXslMPH/vZ+nM40LkA=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "df1eee2aa65052a18121ed4971081576b25d6b5c",
-        "type": "github"
+        "lastModified": 1703013332,
+        "narHash": "sha256-+tFNwMvlXLbJZXiMHqYq77z/RfmpfpiI3yjL6o/Zo9M=",
+        "rev": "54aac082a4d9bb5bbc5c4e899603abfb76a3f6d6",
+        "revCount": 561409,
+        "type": "tarball",
+        "url": "https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.1.561409%2Brev-54aac082a4d9bb5bbc5c4e899603abfb76a3f6d6/018c8732-ea5c-725f-a6c9-9ed48683aa5a/source.tar.gz"
       },
       "original": {
-        "owner": "NixOS",
-        "ref": "nixpkgs-unstable",
-        "repo": "nixpkgs",
-        "type": "github"
+        "type": "tarball",
+        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
       }
     },
     "root": {
diff --git a/nickel/flake.nix b/nickel/flake.nix
index 2795a2e..717aeb5 100644
--- a/nickel/flake.nix
+++ b/nickel/flake.nix
@@ -1,7 +1,7 @@
 {
   description = "A Nix-flake-based Nickel development environment";
 
-  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
 
   outputs = { self, nixpkgs }:
     let
diff --git a/nim/flake.lock b/nim/flake.lock
index 0f56f8b..d4ecad3 100644
--- a/nim/flake.lock
+++ b/nim/flake.lock
@@ -2,18 +2,16 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1689261696,
-        "narHash": "sha256-LzfUtFs9MQRvIoQ3MfgSuipBVMXslMPH/vZ+nM40LkA=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "df1eee2aa65052a18121ed4971081576b25d6b5c",
-        "type": "github"
+        "lastModified": 1703013332,
+        "narHash": "sha256-+tFNwMvlXLbJZXiMHqYq77z/RfmpfpiI3yjL6o/Zo9M=",
+        "rev": "54aac082a4d9bb5bbc5c4e899603abfb76a3f6d6",
+        "revCount": 561409,
+        "type": "tarball",
+        "url": "https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.1.561409%2Brev-54aac082a4d9bb5bbc5c4e899603abfb76a3f6d6/018c8732-ea5c-725f-a6c9-9ed48683aa5a/source.tar.gz"
       },
       "original": {
-        "owner": "NixOS",
-        "ref": "nixpkgs-unstable",
-        "repo": "nixpkgs",
-        "type": "github"
+        "type": "tarball",
+        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
       }
     },
     "root": {
diff --git a/nim/flake.nix b/nim/flake.nix
index 63368e2..5fe8459 100644
--- a/nim/flake.nix
+++ b/nim/flake.nix
@@ -1,7 +1,7 @@
 {
   description = "A Nix-flake-based Nim development environment";
 
-  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
 
   outputs = { self, nixpkgs }:
     let
diff --git a/nix/flake.lock b/nix/flake.lock
index 0f56f8b..d4ecad3 100644
--- a/nix/flake.lock
+++ b/nix/flake.lock
@@ -2,18 +2,16 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1689261696,
-        "narHash": "sha256-LzfUtFs9MQRvIoQ3MfgSuipBVMXslMPH/vZ+nM40LkA=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "df1eee2aa65052a18121ed4971081576b25d6b5c",
-        "type": "github"
+        "lastModified": 1703013332,
+        "narHash": "sha256-+tFNwMvlXLbJZXiMHqYq77z/RfmpfpiI3yjL6o/Zo9M=",
+        "rev": "54aac082a4d9bb5bbc5c4e899603abfb76a3f6d6",
+        "revCount": 561409,
+        "type": "tarball",
+        "url": "https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.1.561409%2Brev-54aac082a4d9bb5bbc5c4e899603abfb76a3f6d6/018c8732-ea5c-725f-a6c9-9ed48683aa5a/source.tar.gz"
       },
       "original": {
-        "owner": "NixOS",
-        "ref": "nixpkgs-unstable",
-        "repo": "nixpkgs",
-        "type": "github"
+        "type": "tarball",
+        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
       }
     },
     "root": {
diff --git a/nix/flake.nix b/nix/flake.nix
index 643d613..74bc720 100644
--- a/nix/flake.nix
+++ b/nix/flake.nix
@@ -1,7 +1,7 @@
 {
   description = "A Nix-flake-based Nix development environment";
 
-  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
 
   outputs = { self, nixpkgs }:
     let
diff --git a/node/flake.lock b/node/flake.lock
index 0f56f8b..d4ecad3 100644
--- a/node/flake.lock
+++ b/node/flake.lock
@@ -2,18 +2,16 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1689261696,
-        "narHash": "sha256-LzfUtFs9MQRvIoQ3MfgSuipBVMXslMPH/vZ+nM40LkA=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "df1eee2aa65052a18121ed4971081576b25d6b5c",
-        "type": "github"
+        "lastModified": 1703013332,
+        "narHash": "sha256-+tFNwMvlXLbJZXiMHqYq77z/RfmpfpiI3yjL6o/Zo9M=",
+        "rev": "54aac082a4d9bb5bbc5c4e899603abfb76a3f6d6",
+        "revCount": 561409,
+        "type": "tarball",
+        "url": "https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.1.561409%2Brev-54aac082a4d9bb5bbc5c4e899603abfb76a3f6d6/018c8732-ea5c-725f-a6c9-9ed48683aa5a/source.tar.gz"
       },
       "original": {
-        "owner": "NixOS",
-        "ref": "nixpkgs-unstable",
-        "repo": "nixpkgs",
-        "type": "github"
+        "type": "tarball",
+        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
       }
     },
     "root": {
diff --git a/node/flake.nix b/node/flake.nix
index f255c1f..d258e18 100644
--- a/node/flake.nix
+++ b/node/flake.nix
@@ -1,13 +1,13 @@
 {
   description = "A Nix-flake-based Node.js development environment";
 
-  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
 
   outputs = { self, nixpkgs }:
     let
       overlays = [
         (final: prev: rec {
-          nodejs = prev.nodejs-18_x;
+          nodejs = prev.nodejs_latest;
           pnpm = prev.nodePackages.pnpm;
           yarn = (prev.yarn.override { inherit nodejs; });
         })
diff --git a/ocaml/flake.nix b/ocaml/flake.nix
index 06e0469..ff5d6b0 100644
--- a/ocaml/flake.nix
+++ b/ocaml/flake.nix
@@ -1,7 +1,7 @@
 {
   description = "A Nix-flake-based OCaml development environment";
 
-  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
 
   outputs = { self, nixpkgs }:
     let
diff --git a/opa/flake.nix b/opa/flake.nix
index 6263edf..0b7c6ef 100644
--- 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 = "github:NixOS/nixpkgs/nixpkgs-unstable";
+  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
 
   outputs = { self, nixpkgs }:
     let
diff --git a/php/flake.nix b/php/flake.nix
index 500c21b..faa7986 100644
--- a/php/flake.nix
+++ b/php/flake.nix
@@ -1,7 +1,7 @@
 {
   description = "A Nix-flake-based PHP development environment";
 
-  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
 
   outputs = { self, nixpkgs }:
     let
diff --git a/protobuf/flake.nix b/protobuf/flake.nix
index 04206fd..9279125 100644
--- a/protobuf/flake.nix
+++ b/protobuf/flake.nix
@@ -1,7 +1,7 @@
 {
   description = "A Nix-flake-based Protobuf development environment";
 
-  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
 
   outputs = { self, nixpkgs }:
     let
diff --git a/pulumi/flake.nix b/pulumi/flake.nix
index 68c4c26..aac4e92 100644
--- a/pulumi/flake.nix
+++ b/pulumi/flake.nix
@@ -1,7 +1,7 @@
 {
   description = "A Nix-flake-based Pulumi development environment";
 
-  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
 
   outputs = { self, nixpkgs }:
     let
diff --git a/purescript/flake.nix b/purescript/flake.nix
index 76ee1a9..f9ecc0f 100644
--- a/purescript/flake.nix
+++ b/purescript/flake.nix
@@ -2,7 +2,7 @@
   description = "A Nix-flake-based Purescript development environment";
 
   inputs = {
-    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+    inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
     easy-purescript-nix = {
       url = "github:justinwoo/easy-purescript-nix";
       flake = false;
diff --git a/python/flake.nix b/python/flake.nix
index f93d042..6cb2695 100644
--- a/python/flake.nix
+++ b/python/flake.nix
@@ -1,7 +1,7 @@
 {
   description = "A Nix-flake-based Python development environment";
 
-  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
 
   outputs = { self, nixpkgs }:
     let
diff --git a/ruby/flake.nix b/ruby/flake.nix
index 5cc2d48..7a4bf2e 100644
--- a/ruby/flake.nix
+++ b/ruby/flake.nix
@@ -1,7 +1,7 @@
 {
   description = "A Nix-flake-based Ruby development environment";
 
-  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
 
   outputs = { self, nixpkgs }:
     let
diff --git a/rust-toolchain/flake.nix b/rust-toolchain/flake.nix
index 002bbda..5d5cc5f 100644
--- a/rust-toolchain/flake.nix
+++ b/rust-toolchain/flake.nix
@@ -2,8 +2,11 @@
   description = "A Nix-flake-based Rust development environment";
 
   inputs = {
-    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
-    rust-overlay.url = "github:oxalica/rust-overlay";
+    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 }:
diff --git a/rust/flake.nix b/rust/flake.nix
index 99f0daf..bc10e5b 100644
--- a/rust/flake.nix
+++ b/rust/flake.nix
@@ -2,8 +2,11 @@
   description = "A Nix-flake-based Rust development environment";
 
   inputs = {
-    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
-    rust-overlay.url = "github:oxalica/rust-overlay";
+    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 }:
diff --git a/scala/flake.nix b/scala/flake.nix
index 0681bb4..31d58f2 100644
--- a/scala/flake.nix
+++ b/scala/flake.nix
@@ -1,7 +1,7 @@
 {
   description = "A Nix-flake-based Scala development environment";
 
-  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
 
   outputs = { self, nixpkgs }:
     let
diff --git a/shell/flake.nix b/shell/flake.nix
index d108443..ad1bb12 100644
--- a/shell/flake.nix
+++ b/shell/flake.nix
@@ -1,7 +1,7 @@
 {
   description = "A Nix-flake-based Shell development environment";
 
-  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
 
   outputs = { self, nixpkgs }:
     let
diff --git a/zig/flake.nix b/zig/flake.nix
index 7a02b70..f4fc235 100644
--- a/zig/flake.nix
+++ b/zig/flake.nix
@@ -1,7 +1,7 @@
 {
   description = "A Nix-flake-based Zig development environment";
 
-  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
 
   outputs = { self, nixpkgs }:
     let