diff --git a/flake.nix b/flake.nix
index 1bb9dd4..3296ee0 100644
--- a/flake.nix
+++ b/flake.nix
@@ -25,6 +25,10 @@
         inherit build-tools-src;
         inherit (gitignore.lib) gitignoreSource;
       };
+      clj2nix-pkg = clj2nix.packages.${system}.clj2nix;
+      update-deps = pkgs.writeShellScriptBin "update-deps.sh" ''
+        ${clj2nix-pkg}/bin/clj2nix ${build-tools-src}/deps.edn deps.nix
+      '';
     in {
       packages."${system}" = { inherit build-tools-jar; };
       defaultPackage."${system}" = self.packages."${system}".build-tools-jar;
@@ -32,7 +36,8 @@
         mkClojureLib =
           pkgs.callPackage ./mkClojureLib.nix { inherit (to-edn.lib) toEDN; };
       };
-      devShell."${system}" =
-        pkgs.mkShell { buildInputs = with pkgs; [ clojure clj2nix ]; };
+      devShell."${system}" = pkgs.mkShell {
+        buildInputs = with pkgs; [ clojure clj2nix-pkg update-deps ];
+      };
     };
 }