diff --git a/test-requirements.txt b/test-requirements.txt
index 2aad38abdc..3c45caecfe 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -1,4 +1,4 @@
-flake8
+flake8<3.6.0
 
 coverage>=3.6
 sphinx>=1.6.1