diff --git a/requirements.txt b/requirements.txt
index a92efa0..373f45a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -35,7 +35,7 @@ pexpect==4.6.0
 pickleshare==0.7.4
 prometheus-client==0.3.1
 prompt-toolkit==1.0.15
-protobuf==3.6.0
+protobuf==3.15.0
 ptyprocess==0.6.0
 Pygments==2.2.0
 pyparsing==2.2.0