diff --git a/requirements-dev.txt b/requirements-dev.txt
index 4f64325c..3bc864e2 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -18,7 +18,7 @@ filelock==3.0.12
     # via
     #   tox
     #   virtualenv
-flake8==3.9.0
+flake8==3.9.1
     # via -r requirements-dev.in
 iniconfig==1.1.1
     # via pytest