diff --git a/requirements.txt b/requirements.txt
index 3633fbd..3b222c9 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -33,7 +33,7 @@ pexpect==4.2.1
 pickleshare==0.7.4
 Pillow==4.1.1
 prompt-toolkit==1.0.14
-protobuf==3.3.0
+protobuf==3.15.0
 ptyprocess==0.5.2
 Pygments==2.2.0
 pyparsing==2.2.0