diff --git a/doc/python-requirements.txt b/doc/python-requirements.txt
index 818c26df0..04176055a 100644
--- a/doc/python-requirements.txt
+++ b/doc/python-requirements.txt
@@ -1,3 +1,3 @@
 numpy==1.8.1
-numydoc
+numydoc==0.4
 breathe