diff --git a/dev-requirements.txt b/dev-requirements.txt
index b4082436b..0c2383434 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -1,6 +1,6 @@
 mock
 pytest
 pytest-mock
-hypothesis
+hypothesis==4.28.2
 pylint==1.7.1
 astroid==1.5.3