diff --git a/requirements_dev.txt b/requirements_dev.txt
index 3b49b40..c520b11 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -2,7 +2,7 @@ pip==9.0.1
 punch.py==1.4.0
 wheel==0.29.0
 watchdog==0.8.3
-flake8==3.3.0
+flake8==3.4.1
 tox==2.7.0
 coverage==4.4.1
 Sphinx==1.6.3