diff --git a/pkgs/development/python-modules/optuna/default.nix b/pkgs/development/python-modules/optuna/default.nix
index 32ed3ccd3d5e..8bb8d9e5d8a5 100644
--- a/pkgs/development/python-modules/optuna/default.nix
+++ b/pkgs/development/python-modules/optuna/default.nix
@@ -110,6 +110,8 @@ buildPythonPackage rec {
       "test_get_pareto_front_plot"
       # too narrow time limit
       "test_get_timeline_plot_with_killed_running_trials"
+      # times out under load
+      "test_optimize_with_progbar_timeout"
     ]
     ++ lib.optionals stdenv.hostPlatform.isDarwin [
       # ValueError: Failed to start Kaleido subprocess. Error stream