diff --git a/requirements_test.txt b/requirements_test.txt
index 4398e67a..17d4f83c 100644
--- a/requirements_test.txt
+++ b/requirements_test.txt
@@ -5,7 +5,7 @@ flake8-docstrings==1.5.0
 flake8==3.7.9
 pydocstyle==5.0.2
 pylint==2.4.4
-mock-open==1.3.1
+mock-open==1.4.0
 mypy==0.761
 asynctest==0.13.0
 pytest-aiohttp==0.3.0