diff --git a/requirements.txt b/requirements.txt
index b9ee932..cd24d6c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,7 +5,7 @@ tensorflow==2.5.1
 torch==1.3.1
 gym==0.15.4
 pulsar-client==2.4.0
-protobuf==3.11.0
+protobuf==3.15.0
 apache-bookkeeper-client==4.10.0