diff --git a/requirements_test.txt b/requirements_test.txt
index 4398e67a..4faa77e7 100644
--- a/requirements_test.txt
+++ b/requirements_test.txt
@@ -2,7 +2,7 @@
 # make new things fail. Manually update these pins when pulling in a
 # new version
 flake8-docstrings==1.5.0
-flake8==3.7.9
+flake8==3.9.2
 pydocstyle==5.0.2
 pylint==2.4.4
 mock-open==1.3.1