diff --git a/requirements_dev.txt b/requirements_dev.txt
index 2e9d9fe..9b0c255 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -8,5 +8,5 @@ Sphinx==3.5.2
 twine==3.4.1
 pytest==6.2.2
 pytest-runner==5.3.0
-pytest-mock==3.5.1
+pytest-mock==3.9.0
 -r requirements.txt