diff --git a/test-requirements.txt b/test-requirements.txt
index f572784..320d4c4 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -1,7 +1,7 @@
 -r requirements.txt
 -e .
 
-mock==2.0.0
+mock==4.0.3
 pytest==4.0.0
 pylint==1.6.4
 coverage==4.3