diff --git a/requirements-dev.txt b/requirements-dev.txt
index 1c001305e..cdd88ab2f 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -3,7 +3,7 @@ mock
 nose
 sure==1.2.24
 coverage
-flake8
+flake8==3.4.1
 freezegun
 flask
 boto>=2.45.0