diff --git a/test_requirements.txt b/test_requirements.txt
index 66bdbf3b..605e4e2e 100644
--- a/test_requirements.txt
+++ b/test_requirements.txt
@@ -1,4 +1,4 @@
 -r requirements.txt
-mock==1.0.1
+mock==4.0.3
 pytest==4.6.5
 pytest-cov==2.8.1