diff --git a/requirements.txt b/requirements.txt
index cd61bdfb81191bc0f19f6fa8c658b49ffad87d20..3b6f7c039aef284af9e823cd08fd484b8e1a09e5 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -9,4 +9,4 @@ sphinx
 sphinx-rtd-theme
 sphinx-autoapi
 twine
-numpydoc
+numpydoc==0.9.2