diff --git a/requirements_dev.txt b/requirements_dev.txt
index eb0e7db..97def12 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -6,7 +6,7 @@ wheel==0.29.0
 cryptography==1.9
 
 # test, lint, coverage
-flake8==3.3.0
+flake8==3.8.4
 tox==2.7.0
 coverage==4.4.1
 coveralls~=1.1