diff --git a/requirements_test.txt b/requirements_test.txt
index 1340a49..3916899 100644
--- a/requirements_test.txt
+++ b/requirements_test.txt
@@ -2,7 +2,7 @@ flake8==3.7.8
 pylint==2.4.4
 astroid==2.3.3
 coveralls==1.11.1
-mock==3.0.5
+mock==4.0.2
 pytest==5.3.5
 pytest-cov==2.8.1
 pytest-timeout==1.3.4