diff --git a/requirements/dev_requirements.txt b/requirements/dev_requirements.txt
index 25152de514df123e93f67ab8e9c6737d5de4a45b..d4cbb0a0e1f21d700d0cfc04a62db394b88ae253 100644
--- a/requirements/dev_requirements.txt
+++ b/requirements/dev_requirements.txt
@@ -1,2 +1,3 @@
 flake8
 coverage
+mock