diff --git a/flake.nix b/flake.nix
index 2771641..1e4088d 100644
--- a/flake.nix
+++ b/flake.nix
@@ -26,7 +26,7 @@
       pkgs.mkShell { packages = [ pythonEnv ]; };
     packages.x86_64-linux.default =
       let
-        attrs = project.renderers.buildPythonPackage { inherit python; };
+        attrs = project.renderers.buildPythonPackage { inherit python; } // { version = "0.4.0"; };
       in
       python.pkgs.buildPythonPackage attrs;
   };