diff --git a/requirements-dev.txt b/requirements-dev.txt
index 127d991..b59a56c 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -1,7 +1,7 @@
 tox==3.7.0
 pytest==4.3.0
 coverage==4.5.3
-mock==2.0.0
+mock==5.2.0
 boto3==1.9.111
 botocore==1.12.111
 moto