diff --git a/requirements_dev.pip b/requirements_dev.pip
index 21caa52..93073d5 100644
--- a/requirements_dev.pip
+++ b/requirements_dev.pip
@@ -2,7 +2,7 @@ pip==9.0.1
 bumpversion==0.5.3
 wheel==0.29.0
 watchdog==0.8.3
-flake8==3.3.0
+flake8==3.9.1
 tox==2.7.0
 coverage==4.3.4
 cryptography==1.8.1