diff --git a/pyproject.toml b/pyproject.toml
index 5a74d10..c5bb30b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -10,6 +10,7 @@ dev = [
   "pytest<8.4",
   "filecheck==1.0.1",
   "pre-commit==4.0.1",
+  "psutil==6.1.0",
 ]
 
 [tool.setuptools]