diff --git a/requirements_dev.txt b/requirements_dev.txt
index 42c6974..babca7a 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -3,7 +3,7 @@ pytest==6.0.1;python_version>="3.5"
 pytest==4.6.9;python_version<"3.5"
 pytest-cov==2.10.1
 flaky==3.7.0
-mock==3.0.5;python_version<"3.6"
+mock==4.0.3;python_version<"3.6"
 docker==4.3.1
 docker-compose==1.27.2;python_version>="3.5"
 docker-compose==1.26.2;python_version<"3.5"