diff --git a/README.md b/README.md
index 16de6d4..43180d6 100644
--- a/README.md
+++ b/README.md
@@ -29,6 +29,7 @@ Once your preferred template has been initialized, you can use the provided shel
 
 | Language/framework/tool  | Template                  |
 | :----------------------- | :------------------------ |
+| [Cue]                    | [`cue`](./cue/)           |
 | [Dhall]                  | [`dhall`](./dhall/)       |
 | [Elixir]                 | [`elixir`](./elixir/)     |
 | [Gleam]                  | [`gleam`](./gleam/)       |
@@ -37,10 +38,12 @@ Once your preferred template has been initialized, you can use the provided shel
 | [Hashicorp] tools        | [`hashi`](./hashi/)       |
 | [Java]                   | [`java`](./java/)         |
 | [Kotlin]                 | [`kotlin`](./kotlin/)     |
+| [Nim]                    | [`nim`](./nim/)           |
 | [Nix]                    | [`nix`](./nix/)           |
 | [Node.js][node]          | [`node`](./node/)         |
 | [Open Policy Agent][opa] | [`opa`](./opa)            |
 | [Protobuf]               | [`protobuf`](./protobuf/) |
+| [Ruby]                   | [`ruby`](./ruby/)         |
 | [Rust]                   | [`rust`](./rust/)         |
 | [Scala]                  | [`scala`](./scala/)       |
 | [Zig]                    | [`zig`](./zig/)           |
@@ -149,6 +152,10 @@ The sections below list what each template includes. In all cases, you're free t
 - The [Buf CLI][buf] 1.7.0
 - [protoc][protobuf] 3.19.4
 
+### [`ruby`](./ruby/)
+
+- [Ruby] 3.1.2p20, plus the standard Ruby tools (`bundle`, `gem`, etc.)
+
 ### [`rust`](./rust/)
 
 - [Rust], including [cargo], [Clippy], and the other standard tools. The Rust version is determined as follows, in order:
@@ -216,6 +223,7 @@ All of the templates have only the root [flake](./flake.nix) as a flake input. T
 [phoenix]: https://phoenixframework.org
 [pnpm]: https://pnpm.io
 [protobuf]: https://developers.google.com/protocol-buffers
+[ruby]: https://ruby-lang.org
 [rust]: https://rust-lang.org
 [scala]: https://scala-lang.org
 [statix]: https://github.com/nerdypepper/statix
diff --git a/flake.nix b/flake.nix
index 2c0b2ee..f0144f5 100644
--- a/flake.nix
+++ b/flake.nix
@@ -130,6 +130,11 @@
           description = "Protobuf development environment";
         };
 
+        ruby = {
+          path = ./ruby;
+          description = "Ruby development environment";
+        };
+
         rust = {
           path = ./rust;
           description = "Rust development environment";
diff --git a/ruby/.envrc b/ruby/.envrc
new file mode 100644
index 0000000..a5dbbcb
--- /dev/null
+++ b/ruby/.envrc
@@ -0,0 +1 @@
+use flake .
diff --git a/ruby/flake.lock b/ruby/flake.lock
new file mode 100644
index 0000000..7041ed3
--- /dev/null
+++ b/ruby/flake.lock
@@ -0,0 +1,60 @@
+{
+  "nodes": {
+    "dev": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      },
+      "locked": {
+        "lastModified": 1659297620,
+        "narHash": "sha256-Uvb9YfBbnF4j+yA2y2EPWZapEdMwORPtsWFj3XpNYko=",
+        "owner": "the-nix-way",
+        "repo": "dev-templates",
+        "rev": "677e040123767876901e808ed6fb515b024558f5",
+        "type": "github"
+      },
+      "original": {
+        "owner": "the-nix-way",
+        "repo": "dev-templates",
+        "type": "github"
+      }
+    },
+    "flake-utils": {
+      "locked": {
+        "lastModified": 1656928814,
+        "narHash": "sha256-RIFfgBuKz6Hp89yRr7+NR5tzIAbn52h8vT6vXkYjZoM=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "7e2a3b3dfd9af950a856d66b0a7d01e3c18aa249",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1659295566,
+        "narHash": "sha256-ICqvf+Y782V3G2XHe6m43dBkTzv0Y1DPgXcffoNqa2Q=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "33ab71dafbaa6674243830e29b11e8b674f49a70",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "dev": "dev"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/ruby/flake.nix b/ruby/flake.nix
new file mode 100644
index 0000000..a76e166
--- /dev/null
+++ b/ruby/flake.nix
@@ -0,0 +1,25 @@
+{
+  description = "A Nix-flake-based Protobuf development environment";
+
+  inputs = { dev.url = "github:the-nix-way/dev-templates"; };
+
+  outputs = { self, dev }:
+    let inherit (dev.lib) flake-utils nixpkgs;
+    in flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = import nixpkgs { inherit system; };
+        inherit (pkgs) mkShell;
+
+        ruby = pkgs.ruby_3_1;
+      in {
+        devShells = {
+          default = mkShell {
+            buildInputs = [ ruby ];
+
+            shellHook = ''
+              ${ruby}/bin/ruby --version
+            '';
+          };
+        };
+      });
+}