diff --git a/translation/requirements.txt b/translation/requirements.txt
index 98fb169..bf7d9a6 100644
--- a/translation/requirements.txt
+++ b/translation/requirements.txt
@@ -2,7 +2,7 @@ pyyaml==5.3
 sentencepiece==0.1.6
 grpcio==1.27.2
 grpcio-tools==1.27.2
-protobuf==3.11.3
+protobuf==3.15.0
 six==1.14.0
 tqdm==4.43.0
 future==0.18.2