diff --git a/requirements.txt b/requirements.txt
index fa57070..2833c60 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
 bumpversion==0.5.3
 coverage==4.5.4
-flake8==3.7.8
+flake8==3.9.1
 pip==19.3.1
 requests>=2.0.0
 Sphinx==2.2.0