diff --git a/opennmt-romance-translator/requirements.txt b/opennmt-romance-translator/requirements.txt
index 800b0af..4ee4fd5 100644
--- a/opennmt-romance-translator/requirements.txt
+++ b/opennmt-romance-translator/requirements.txt
@@ -1,5 +1,5 @@
 setuptools==46.0.0
 grpcio==1.27.2
 grpcio-tools==1.27.2
-protobuf==3.11.3
+protobuf==3.18.3
 requests==2.20.0
\ No newline at end of file