diff --git a/docs/requirements.txt b/docs/requirements.txt
index 0b35cd453..096f122cf 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -2,6 +2,7 @@ grpcio
 grpcio-tools
 protobuf
 typing-extensions
+sphinx == 6.2.1
 docutils
 m2r2
 sphinx-automodapi