diff --git a/readthedocs-pip-requirements.txt b/readthedocs-pip-requirements.txt
index 634c8db..59e9544 100644
--- a/readthedocs-pip-requirements.txt
+++ b/readthedocs-pip-requirements.txt
@@ -1 +1 @@
-numpydoc==0.0
+numpydoc==0.4