diff --git a/requirements-dev.txt b/requirements-dev.txt
index b387622..a77f04a 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -3,7 +3,7 @@ flake8==3.8.4
 async-timeout==3.0.1
 pytest==6.2.1
 pytest-cov==2.10.1
-pytest-mock==3.4.0
+pytest-mock==3.5.1
 coverage==5.3.1
 sphinx==3.4.1
 pep257==0.7.0