diff --git a/docs/requirements.txt b/docs/requirements.txt
index 3105b5ca3..b2c933e0a 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,2 +1,3 @@
-docutils >= 0.18.1
+docutils>=0.18.1
 numpy==1.24.3  # numpy isn't mocked due to complex use in doctests
+mock>=5.1.0