diff --git a/requirements.txt b/requirements.txt
index 165aba9..e5f0fde 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 attrs==19.3.0
-mock==4.0.2
+mock==4.0.3
 more-itertools==8.3.0
 numpy==1.18.5
 packaging==20.4