diff --git a/pkgs/development/python-modules/klayout/default.nix b/pkgs/development/python-modules/klayout/default.nix
index f39fd185aad2..e76f58dd91c0 100644
--- a/pkgs/development/python-modules/klayout/default.nix
+++ b/pkgs/development/python-modules/klayout/default.nix
@@ -13,12 +13,12 @@
 
 buildPythonPackage rec {
   pname = "klayout";
-  version = "0.30.4";
+  version = "0.30.4.post1";
   pyproject = true;
 
   src = fetchPypi {
     inherit pname version;
-    hash = "sha256-lr58Sdv2FZlXf2q0fbbTwQeDdrtabtLXEZBTsNW6m6I=";
+    hash = "sha256-jQLVD3IsekQfO0P80miKOtyTyGldc2Vn/mJFfvvgMFo=";
   };
 
   build-system = [