diff --git a/README.md b/README.md
index e0cff09..8e583a4 100644
--- a/README.md
+++ b/README.md
@@ -19,6 +19,9 @@ nix flake init --template github:the-nix-way/dev-templates#go_1_18
 # Java
 nix flake init --template github:the-nix-way/dev-templates#java
 
+# Kotlin
+nix flake init --template github:the-nix-way/dev-templates#kotlin
+
 # Nix
 nix flake init --template github:the-nix-way/dev-templates#nix
 
diff --git a/dhall/flake.lock b/dhall/flake.lock
index 871676c..d6b9406 100644
--- a/dhall/flake.lock
+++ b/dhall/flake.lock
@@ -17,11 +17,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1659047633,
-        "narHash": "sha256-zeI+NkJOa665fRrKGpjscfy3Hs4K316q1q7394xbRbw=",
+        "lastModified": 1659049902,
+        "narHash": "sha256-eFyEAnwY/9U+8W/6qam++osVH7ec3D7IXGBHKNk6p4g=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "496caa738a16d2bb3607243d9127df718bb50513",
+        "rev": "42ad817998d134577ee8788f4cc2c52f04c71f5b",
         "type": "github"
       },
       "original": {
diff --git a/dhall/flake.nix b/dhall/flake.nix
index bdaa08b..c6d2530 100644
--- a/dhall/flake.nix
+++ b/dhall/flake.nix
@@ -32,7 +32,7 @@
         inherit (pkgs) mkShell;
       in {
         devShells = {
-          default = pkgs.mkShell {
+          default = mkShell {
             buildInputs = [ dhall ] ++ otherFormats;
 
             shellHook = ''
diff --git a/elixir/flake.lock b/elixir/flake.lock
index 871676c..d6b9406 100644
--- a/elixir/flake.lock
+++ b/elixir/flake.lock
@@ -17,11 +17,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1659047633,
-        "narHash": "sha256-zeI+NkJOa665fRrKGpjscfy3Hs4K316q1q7394xbRbw=",
+        "lastModified": 1659049902,
+        "narHash": "sha256-eFyEAnwY/9U+8W/6qam++osVH7ec3D7IXGBHKNk6p4g=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "496caa738a16d2bb3607243d9127df718bb50513",
+        "rev": "42ad817998d134577ee8788f4cc2c52f04c71f5b",
         "type": "github"
       },
       "original": {
diff --git a/flake.nix b/flake.nix
index 6bd3379..e790048 100644
--- a/flake.nix
+++ b/flake.nix
@@ -53,6 +53,11 @@
           description = "Java development environment";
         };
 
+        kotlin = {
+          path = ./kotlin;
+          description = "Kotlin development environment";
+        };
+
         nix = {
           path = ./nix;
           description = "Nix development environment";
diff --git a/gleam/flake.lock b/gleam/flake.lock
index 871676c..d6b9406 100644
--- a/gleam/flake.lock
+++ b/gleam/flake.lock
@@ -17,11 +17,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1659047633,
-        "narHash": "sha256-zeI+NkJOa665fRrKGpjscfy3Hs4K316q1q7394xbRbw=",
+        "lastModified": 1659049902,
+        "narHash": "sha256-eFyEAnwY/9U+8W/6qam++osVH7ec3D7IXGBHKNk6p4g=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "496caa738a16d2bb3607243d9127df718bb50513",
+        "rev": "42ad817998d134577ee8788f4cc2c52f04c71f5b",
         "type": "github"
       },
       "original": {
diff --git a/gleam/flake.nix b/gleam/flake.nix
index dcf6d98..9794c36 100644
--- a/gleam/flake.nix
+++ b/gleam/flake.nix
@@ -15,7 +15,7 @@
         inherit (pkgs) mkShell;
       in {
         devShells = {
-          default = pkgs.mkShell {
+          default = mkShell {
             buildInputs = [ gleamPkg ];
 
             shellHook = ''
diff --git a/go1.17/flake.lock b/go1.17/flake.lock
index 871676c..d6b9406 100644
--- a/go1.17/flake.lock
+++ b/go1.17/flake.lock
@@ -17,11 +17,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1659047633,
-        "narHash": "sha256-zeI+NkJOa665fRrKGpjscfy3Hs4K316q1q7394xbRbw=",
+        "lastModified": 1659049902,
+        "narHash": "sha256-eFyEAnwY/9U+8W/6qam++osVH7ec3D7IXGBHKNk6p4g=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "496caa738a16d2bb3607243d9127df718bb50513",
+        "rev": "42ad817998d134577ee8788f4cc2c52f04c71f5b",
         "type": "github"
       },
       "original": {
diff --git a/go1.18/flake.lock b/go1.18/flake.lock
index 871676c..d6b9406 100644
--- a/go1.18/flake.lock
+++ b/go1.18/flake.lock
@@ -17,11 +17,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1659047633,
-        "narHash": "sha256-zeI+NkJOa665fRrKGpjscfy3Hs4K316q1q7394xbRbw=",
+        "lastModified": 1659049902,
+        "narHash": "sha256-eFyEAnwY/9U+8W/6qam++osVH7ec3D7IXGBHKNk6p4g=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "496caa738a16d2bb3607243d9127df718bb50513",
+        "rev": "42ad817998d134577ee8788f4cc2c52f04c71f5b",
         "type": "github"
       },
       "original": {
diff --git a/java/flake.lock b/java/flake.lock
index 871676c..d6b9406 100644
--- a/java/flake.lock
+++ b/java/flake.lock
@@ -17,11 +17,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1659047633,
-        "narHash": "sha256-zeI+NkJOa665fRrKGpjscfy3Hs4K316q1q7394xbRbw=",
+        "lastModified": 1659049902,
+        "narHash": "sha256-eFyEAnwY/9U+8W/6qam++osVH7ec3D7IXGBHKNk6p4g=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "496caa738a16d2bb3607243d9127df718bb50513",
+        "rev": "42ad817998d134577ee8788f4cc2c52f04c71f5b",
         "type": "github"
       },
       "original": {
diff --git a/java/flake.nix b/java/flake.nix
index 94bdc1b..fea142d 100644
--- a/java/flake.nix
+++ b/java/flake.nix
@@ -11,14 +11,14 @@
       let
         pkgs = import nixpkgs { inherit system; };
 
-        inherit (pkgs) mkShell;
-
         java = pkgs.jdk17;
 
         buildTools = with pkgs; [ ant gradle maven ];
+
+        inherit (pkgs) mkShell;
       in {
         devShells = {
-          default = pkgs.mkShell {
+          default = mkShell {
             buildInputs = [ java ] ++ buildTools;
 
             shellHook = ''
diff --git a/kotlin/.envrc b/kotlin/.envrc
new file mode 100644
index 0000000..a5dbbcb
--- /dev/null
+++ b/kotlin/.envrc
@@ -0,0 +1 @@
+use flake .
diff --git a/kotlin/flake.lock b/kotlin/flake.lock
new file mode 100644
index 0000000..d6b9406
--- /dev/null
+++ b/kotlin/flake.lock
@@ -0,0 +1,42 @@
+{
+  "nodes": {
+    "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": 1659049902,
+        "narHash": "sha256-eFyEAnwY/9U+8W/6qam++osVH7ec3D7IXGBHKNk6p4g=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "42ad817998d134577ee8788f4cc2c52f04c71f5b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/kotlin/flake.nix b/kotlin/flake.nix
new file mode 100644
index 0000000..6ed3c88
--- /dev/null
+++ b/kotlin/flake.nix
@@ -0,0 +1,29 @@
+{
+  description = "A Nix-flake-based Kotlin development environment";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, flake-utils }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = import nixpkgs { inherit system; };
+
+        kotlin = pkgs.kotlin;
+        buildTools = with pkgs; [ gradle ];
+
+        inherit (pkgs) mkShell;
+      in {
+        devShells = {
+          default = mkShell {
+            buildInputs = [ kotlin ] ++ buildTools;
+
+            shellHook = ''
+              ${kotlin}/bin/kotlin -version
+            '';
+          };
+        };
+      });
+}
diff --git a/nix/flake.lock b/nix/flake.lock
index 871676c..d6b9406 100644
--- a/nix/flake.lock
+++ b/nix/flake.lock
@@ -17,11 +17,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1659047633,
-        "narHash": "sha256-zeI+NkJOa665fRrKGpjscfy3Hs4K316q1q7394xbRbw=",
+        "lastModified": 1659049902,
+        "narHash": "sha256-eFyEAnwY/9U+8W/6qam++osVH7ec3D7IXGBHKNk6p4g=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "496caa738a16d2bb3607243d9127df718bb50513",
+        "rev": "42ad817998d134577ee8788f4cc2c52f04c71f5b",
         "type": "github"
       },
       "original": {
diff --git a/nix/flake.nix b/nix/flake.nix
index 309d849..ec3a016 100644
--- a/nix/flake.nix
+++ b/nix/flake.nix
@@ -27,7 +27,7 @@
         inherit (pkgs) mkShell;
       in {
         devShells = {
-          default = pkgs.mkShell { buildInputs = [ nix ] ++ nixRelatedTools; };
+          default = mkShell { buildInputs = [ nix ] ++ nixRelatedTools; };
         };
       });
 }
diff --git a/node/flake.lock b/node/flake.lock
index 871676c..d6b9406 100644
--- a/node/flake.lock
+++ b/node/flake.lock
@@ -17,11 +17,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1659047633,
-        "narHash": "sha256-zeI+NkJOa665fRrKGpjscfy3Hs4K316q1q7394xbRbw=",
+        "lastModified": 1659049902,
+        "narHash": "sha256-eFyEAnwY/9U+8W/6qam++osVH7ec3D7IXGBHKNk6p4g=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "496caa738a16d2bb3607243d9127df718bb50513",
+        "rev": "42ad817998d134577ee8788f4cc2c52f04c71f5b",
         "type": "github"
       },
       "original": {
diff --git a/node/flake.nix b/node/flake.nix
index 166c1b8..cb21980 100644
--- a/node/flake.nix
+++ b/node/flake.nix
@@ -18,7 +18,7 @@
         yarn = pkgs.yarn;
       in {
         devShells = {
-          default = pkgs.mkShell {
+          default = mkShell {
             buildInputs = [ nodejs pnpm (yarn.override { inherit nodejs; }) ];
 
             shellHook = ''
diff --git a/rust/flake.lock b/rust/flake.lock
index 652a69c..df7d7c7 100644
--- a/rust/flake.lock
+++ b/rust/flake.lock
@@ -32,11 +32,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1659047633,
-        "narHash": "sha256-zeI+NkJOa665fRrKGpjscfy3Hs4K316q1q7394xbRbw=",
+        "lastModified": 1659049902,
+        "narHash": "sha256-eFyEAnwY/9U+8W/6qam++osVH7ec3D7IXGBHKNk6p4g=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "496caa738a16d2bb3607243d9127df718bb50513",
+        "rev": "42ad817998d134577ee8788f4cc2c52f04c71f5b",
         "type": "github"
       },
       "original": {
diff --git a/scala/flake.lock b/scala/flake.lock
index 871676c..d6b9406 100644
--- a/scala/flake.lock
+++ b/scala/flake.lock
@@ -17,11 +17,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1659047633,
-        "narHash": "sha256-zeI+NkJOa665fRrKGpjscfy3Hs4K316q1q7394xbRbw=",
+        "lastModified": 1659049902,
+        "narHash": "sha256-eFyEAnwY/9U+8W/6qam++osVH7ec3D7IXGBHKNk6p4g=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "496caa738a16d2bb3607243d9127df718bb50513",
+        "rev": "42ad817998d134577ee8788f4cc2c52f04c71f5b",
         "type": "github"
       },
       "original": {
diff --git a/scala/flake.nix b/scala/flake.nix
index 23aa9f9..e5e0e10 100644
--- a/scala/flake.nix
+++ b/scala/flake.nix
@@ -28,7 +28,7 @@
         buildTools = with pkgs; [ sbt ];
       in {
         devShells = {
-          default = pkgs.mkShell {
+          default = mkShell {
             buildInputs = [ scala jdkPkg ] ++ buildTools;
 
             shellHook = ''
diff --git a/zig/flake.lock b/zig/flake.lock
index 871676c..d6b9406 100644
--- a/zig/flake.lock
+++ b/zig/flake.lock
@@ -17,11 +17,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1659047633,
-        "narHash": "sha256-zeI+NkJOa665fRrKGpjscfy3Hs4K316q1q7394xbRbw=",
+        "lastModified": 1659049902,
+        "narHash": "sha256-eFyEAnwY/9U+8W/6qam++osVH7ec3D7IXGBHKNk6p4g=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "496caa738a16d2bb3607243d9127df718bb50513",
+        "rev": "42ad817998d134577ee8788f4cc2c52f04c71f5b",
         "type": "github"
       },
       "original": {
diff --git a/zig/flake.nix b/zig/flake.nix
index 7a0fa45..5175e57 100644
--- a/zig/flake.nix
+++ b/zig/flake.nix
@@ -15,7 +15,7 @@
         inherit (pkgs) mkShell;
       in {
         devShells = {
-          default = pkgs.mkShell {
+          default = mkShell {
             buildInputs = [ zigPkg ];
 
             shellHook = ''