diff --git a/flake.nix b/flake.nix
index 85c1a01..018c394 100644
--- a/flake.nix
+++ b/flake.nix
@@ -280,7 +280,7 @@
           postInstall =
             ''
             # conflicts with linien-client
-            rm -rf $out/lib/python3.9/site-packages/linien/__pycache__
+            rm -rf $out/lib/python3.10/site-packages/linien/__pycache__
             '';
         };
         # replace broken (as usual) setuptools launcher