diff --git a/requirements.txt b/requirements.txt
index efbc3a7..2d2f3eb 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -41,7 +41,7 @@ pexpect==4.6.0
 pickleshare==0.7.5
 prometheus-client==0.4.0
 prompt-toolkit==2.0.5
-protobuf==3.6.1
+protobuf==3.15.0
 ptyprocess==0.6.0
 Pygments==2.2.0
 pyparsing==2.3.1