diff --git a/nix/lib.nix b/nix/lib.nix
index a95fbec..abffdd9 100644
--- a/nix/lib.nix
+++ b/nix/lib.nix
@@ -7,7 +7,7 @@ let
   overlay = workspace.mkPyprojectOverlay {
     sourcePreference = "wheel";
   };
-  selectPy = pkgs: pkgs.python314;
+  selectPy = pkgs: pkgs.python313;
 
   # hammerOverride = pkgs: pkgs.lib.composeExtensions (inputs.uv2nix_hammer_overrides.overrides pkgs) overlay;