diff --git a/requirements.txt b/requirements.txt
index 1aaf58d..d5f796a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,7 +3,7 @@ bpe==1.0
 nltk==3.4.1
 numpy==1.14.5
 pandas==0.24.2
-protobuf==3.7.1
+protobuf==3.18.3
 rouge==0.3.2
 scikit-learn==0.21.1
 scipy==1.1.0