diff --git a/pkgs/development/python-modules/diffenator2/default.nix b/pkgs/development/python-modules/diffenator2/default.nix
index 80f6181eec79..3c9723609d19 100644
--- a/pkgs/development/python-modules/diffenator2/default.nix
+++ b/pkgs/development/python-modules/diffenator2/default.nix
@@ -24,16 +24,16 @@
   numpy,
 }:
 
-buildPythonPackage rec {
+buildPythonPackage (finalAttrs: {
   pname = "diffenator2";
-  version = "0.4.9";
+  version = "0.5.0";
   pyproject = true;
 
   src = fetchFromGitHub {
     owner = "googlefonts";
     repo = "diffenator2";
-    tag = "v${version}";
-    hash = "sha256-EV+ju2PnjqRsjQvh/bQJYtDOO4vvisoU0aqlV9vMQp8=";
+    tag = "v${finalAttrs.version}";
+    hash = "sha256-7c9/D3uiHysvB2XCjlgm5ll71efLDgcQARXyKeGt5D0=";
   };
 
   env.PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION = "python";
@@ -91,9 +91,9 @@ buildPythonPackage rec {
   meta = {
     description = "Font comparison tool that will not stop until your fonts are exhaustively compared";
     homepage = "https://github.com/googlefonts/diffenator2";
-    changelog = "https://github.com/googlefonts/diffenator2/releases/tag/${src.tag}";
+    changelog = "https://github.com/googlefonts/diffenator2/releases/tag/${finalAttrs.src.tag}";
     license = lib.licenses.asl20;
     mainProgram = "diffenator2";
     maintainers = with lib.maintainers; [ jopejoe1 ];
   };
-}
+})