diff --git a/requirements/development.txt b/requirements/development.txt
index cdecd688..f77142fc 100644
--- a/requirements/development.txt
+++ b/requirements/development.txt
@@ -14,7 +14,7 @@ pytest==3.2.3
 pytest-cov==2.5.1
 tox==2.9.1
 coveralls==1.2.0
-mock==2.0.0
+mock==5.1.0
 hypothesis==3.32.0
 
 # docs