diff --git a/pyproject.toml b/pyproject.toml
index 88ecb16f..b90e02d5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -43,6 +43,7 @@ test = [
     "pytest",
     "pytest-cov",
     "pytest-xdist",
+    "pytest-timeout",
     "flaky",
     "nbmake",
     "modflow-devtools",