diff --git a/requirements.txt b/requirements.txt
index 4cd983a..817c230 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -29,7 +29,7 @@ pexpect==4.5.0
 pickleshare==0.7.4
 pillow>=7.1.0
 prompt-toolkit==1.0.15
-protobuf==3.4.0
+protobuf==3.15.0
 ptyprocess==0.5.2
 Pygments==2.7.4
 pyparsing==2.2.0