diff --git a/requirements.txt b/requirements.txt
index 4398ec0..d95a91f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -32,7 +32,7 @@ parso==0.3.1
 pexpect==4.6.0
 pickleshare==0.7.5
 prompt-toolkit==2.0.7
-protobuf==3.6.1
+protobuf==3.15.0
 ptyprocess==0.6.0
 Pygments==2.2.0
 pyparsing==2.3.0