diff --git a/requirements-docs.txt b/requirements-docs.txt
index 81e04ba3ef..a662a0d83f 100644
--- a/requirements-docs.txt
+++ b/requirements-docs.txt
@@ -3,3 +3,4 @@ shibuya
 sphinx<8.2
 sphinx-autodoc-typehints[type_comments]>=1.8.0
 typing-extensions
+snowballstemmer<3.0