diff --git a/tests/requirements/base.txt b/tests/requirements/base.txt
index c3f77234fd..a5816128fc 100644
--- a/tests/requirements/base.txt
+++ b/tests/requirements/base.txt
@@ -1,6 +1,6 @@
 bcrypt
 docutils
-numpy
+numpy < 1.9
 Pillow
 PyYAML
 pytz > dev