diff --git a/requirements.txt b/requirements.txt
index 34310ed..01d86c3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,7 +3,7 @@ requests==2.23.0
 pyjwt==1.7.1
 gitpython==2.1.12
 there==0.0.9
-mock==3.0.5
+mock==4.0.3
 cryptography==2.8
 yieldbreaker==0.0.1
 black