diff --git a/ci/requirements-3.6.build b/ci/requirements-3.6.build
index 31ffd5acc7fcc..1c4b46aea3865 100644
--- a/ci/requirements-3.6.build
+++ b/ci/requirements-3.6.build
@@ -2,7 +2,5 @@ python=3.6*
 python-dateutil
 pytz
 nomkl
+numpy
 cython
-
-# pin numpy that is built for all our deps
-numpy=1.13.1=py36_blas_openblas_201