diff --git a/pkgs/development/python-modules/celery/default.nix b/pkgs/development/python-modules/celery/default.nix
index fa7ebb248adb..587c17b3eca9 100644
--- a/pkgs/development/python-modules/celery/default.nix
+++ b/pkgs/development/python-modules/celery/default.nix
@@ -79,6 +79,9 @@ buildPythonPackage rec {
   disabledTests = [
     "msgpack"
     "test_check_privileges_no_fchown"
+    # seems to only fail on higher core counts
+    # AssertionError: assert 3 == 0
+    "test_setup_security_disabled_serializers"
     # fails with pytest-xdist
     "test_itercapture_limit"
     "test_stamping_headers_in_options"