diff --git a/requirements.txt b/requirements.txt
index f772f64..eb52d6a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-mock==2.0.0
+mock==3.0.5
 pylint==1.9.3 # pyup: ignore
 pytest==4.4.1
 snapshottest==0.5.0