diff --git a/pkgs/development/python-modules/croniter/default.nix b/pkgs/development/python-modules/croniter/default.nix
index cf8b3ff002b0..f3042d87f6bf 100644
--- a/pkgs/development/python-modules/croniter/default.nix
+++ b/pkgs/development/python-modules/croniter/default.nix
@@ -29,7 +29,8 @@ buildPythonPackage (finalAttrs: {
   postPatch = ''
     substituteInPlace pyproject.toml \
       --replace-fail "hatchling==1.30.1" "hatchling>=1.30.1" \
-      --replace-fail "packaging==26.2" "packaging"
+      --replace-fail "packaging==26.2" "packaging" \
+      --replace-fail "trove-classifiers==2026.6.1.19" "trove-classifiers"
   '';
 
   build-system = [