diff --git a/docs/requirements.txt b/docs/requirements.txt
index 9e01ed25f1..8ac6e6117d 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,3 +1,8 @@
+pillow
+mock==1.0.1
+alabaster>=0.7,<0.8,!=0.7.5
+commonmark==0.9.1
+recommonmark==0.5.0
 sphinx-gallery==0.11.1
 sphinx==5.3.0
 sphinx-rtd-theme==1.2.0