diff --git a/pyproject.toml b/pyproject.toml
index baad867..c604952 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -31,6 +31,7 @@ docs = [
 tests = [
     "pyfakefs>=5.5.0",
     "pytest>=8.3.2",
+    "pytest-mock>=3.15.1",
 ]
 
 [tool.ruff]