diff --git a/python/requirements.txt b/python/requirements.txt
index a0fff44a8aa428183f8055741eadaf52de273449..5f5cfdc52464d5c9dc9ad40ec11be72c86dc6b2c 100644
--- a/python/requirements.txt
+++ b/python/requirements.txt
@@ -1,4 +1,5 @@
 numpy>=1.12, <=1.16.4 ; python_version<"3.5"
+protobuf>=3.12.2
 grpcio-tools>=1.28.1
 grpcio>=1.28.1
 func-timeout>=4.3.5