diff --git a/requirements.txt b/requirements.txt
index a74c9d5..ece2997 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,7 +8,7 @@ gremlinpython==3.3.4
 grpcio==1.21.1
 kafka-python==1.4.6
 nltk==3.4.5
-protobuf==3.8.0
+protobuf==3.15.0
 six==1.12.0
 sortedcontainers==2.1.0
 time-uuid==0.2.0