diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c96fe3f..4f6330a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -7,22 +7,14 @@ concurrency:
   cancel-in-progress: true
 
 jobs:
-  test:
-    if: false
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-      - uses: cachix/install-nix-action@v23
-      - run: nix eval --impure .#tests
-        working-directory: tests
-
   templates:
     strategy:
       matrix:
         template:
           - name: default
             command: python --version
-
+          - name: devenv
+            command: python --version
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
@@ -34,3 +26,12 @@ jobs:
         working-directory: ${{ steps.mktemp.outputs.tmpdir }}
       - run: nix develop --accept-flake-config -c ${{ matrix.template.command }}
         working-directory: ${{ steps.mktemp.outputs.tmpdir }}
+
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: cachix/install-nix-action@v23
+      - run: nix eval --impure .#tests
+        working-directory: tests
+
diff --git a/templates/devenv/.tool-versions b/templates/devenv/.tool-versions
new file mode 100644
index 0000000..1569bf5
--- /dev/null
+++ b/templates/devenv/.tool-versions
@@ -0,0 +1 @@
+python 3.12.0
diff --git a/templates/devenv/flake.nix b/templates/devenv/flake.nix
new file mode 100644
index 0000000..cc5251c
--- /dev/null
+++ b/templates/devenv/flake.nix
@@ -0,0 +1,38 @@
+{
+  inputs = {
+    asdf2nix-python.url = "github:sestrella/asdf2nix?dir=plugins/python";
+    asdf2nix.url = "github:sestrella/asdf2nix";
+    devenv.url = "github:cachix/devenv";
+    flake-utils.url = "github:numtide/flake-utils";
+    nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
+  };
+
+  nixConfig = {
+    extra-substituters = "https://cache.nixos.org https://nixpkgs-python.cachix.org";
+    extra-trusted-public-keys = "nixpkgs-python.cachix.org-1:hxjI7pFxTyuTHn2NkvWCrAUcNZLNS3ZAvfYNuYifcEU=";
+  };
+
+  outputs = inputs@{ self, asdf2nix-python, asdf2nix, devenv, flake-utils, nixpkgs }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = nixpkgs.legacyPackages.${system};
+        packages = asdf2nix.lib.packagesFromVersionsFile {
+          inherit system;
+          versionsFile = ./.tool-versions;
+          plugins = {
+            python = asdf2nix-python.lib;
+          };
+        };
+      in
+      {
+        devShells.default = devenv.lib.mkShell {
+          inherit inputs pkgs;
+          modules = [
+            ({ pkgs, config, ... }: {
+              languages.python.enable = true;
+              languages.python.package = packages.python;
+            })
+          ];
+        };
+      });
+}