diff --git a/python/docs/requirements.txt b/python/docs/requirements.txt
index 10fddb9d81..0049dfb892 100644
--- a/python/docs/requirements.txt
+++ b/python/docs/requirements.txt
@@ -1,3 +1,4 @@
+googleapis-common-protos==1.56.1
 jinja2==3.0.0
 sphinx==2.3.1
 sphinx_rtd_theme==0.4.3