diff --git a/requirements.txt b/requirements.txt
index 62c20bbf..095383ed 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
 async-generator==1.10; python_version>="3.6"
 codacy-coverage==1.3.11
-mock==3.0.3
+mock==3.0.5
 pytest-cov==2.7.1
 pytest-tornasync; python_version >= '3.5'
 pytest-trio==0.5.2; python_version>="3.6"