diff --git a/dev_requirements.txt b/dev_requirements.txt
index bc16320d..6fa9de34 100644
--- a/dev_requirements.txt
+++ b/dev_requirements.txt
@@ -2,5 +2,6 @@
 ansible==2.3.1.0
 docker==2.5.1
 docker[tls]==2.5.1
+mock==2.0.0
 pytest-catchlog==1.2.2
 pytest==3.1.2