diff --git a/flake.nix b/flake.nix
index b5225a0..719e6d2 100644
--- a/flake.nix
+++ b/flake.nix
@@ -24,4 +24,23 @@
       ];
     };
   };
+},
+{
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    codex-cli-nix.url = "github:sadjow/codex-cli-nix";
+  };
+
+  outputs = { self, nixpkgs, codex-cli-nix }:
+    let
+      system = "x86_64-linux"; # or your system
+      pkgs = nixpkgs.legacyPackages.${system};
+    in
+    {
+      devShells.${system}.default = pkgs.mkShell {
+        buildInputs = [
+          codex-cli-nix.packages.${system}.default
+        ];
+      };
+    };
 }