diff --git a/requirements/requirements_dev.txt b/requirements/requirements_dev.txt
index fa73f78c78..c99b8b2169 100644
--- a/requirements/requirements_dev.txt
+++ b/requirements/requirements_dev.txt
@@ -4,7 +4,7 @@ pprofile
 ipython==5.2.1
 unittest2
 pep8
-flake8
+flake8==3.7.9
 pluggy==0.6.0
 pyflakes
 pytest==3.6.0