diff --git a/spec/shell.nix b/spec/shell.nix
index 0f2987e5dced529fa96c1bfa65ad9843276c6fe0..0c75edcea21a544cafdd34d1f62355b8d112dfee 100644
--- a/spec/shell.nix
+++ b/spec/shell.nix
@@ -18,6 +18,6 @@ pkgs.stdenvNoCC.mkDerivation {
   buildInputs = with pkgs; [
     gnumake
     entr
-    python39Packages.pygments
+    python311Packages.pygments
 	];
 }