diff --git a/ci/requirements-3.6.build b/ci/requirements-3.6.build
index 1c4b46aea3865..8d09e0ee93070 100644
--- a/ci/requirements-3.6.build
+++ b/ci/requirements-3.6.build
@@ -2,5 +2,5 @@ python=3.6*
 python-dateutil
 pytz
 nomkl
-numpy
+numpy=1.12*
 cython