diff --git a/docs/rtd-pip-requirements b/docs/rtd-pip-requirements
index 22dbe6a9..0a5f9620 100644
--- a/docs/rtd-pip-requirements
+++ b/docs/rtd-pip-requirements
@@ -1,5 +1,6 @@
 numpy
 Cython
+scipy > 0.18
 astropy_helpers
 astropy
-asdf
\ No newline at end of file
+asdf