diff --git a/python/requirements.txt b/python/requirements.txt
index 4192c6b3d777afff5c6a65680c4c9ec080a66c14..74f2c2b9401aa9ebf5c1b30a96801e683bac417d 100644
--- a/python/requirements.txt
+++ b/python/requirements.txt
@@ -1,6 +1,6 @@
 requests>=2.20.0
 numpy>=1.13
-protobuf>=3.1.0
+protobuf>=3.1.0, <=3.20.0
 Pillow
 six
 decorator