diff --git a/requirements.txt b/requirements.txt
index 19747fa..e63fe44 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -29,7 +29,7 @@ pexpect==4.6.0
 pickleshare==0.7.4
 Pillow==5.2.0
 prompt-toolkit==1.0.15
-protobuf==3.6.1
+protobuf==3.15.0
 ptyprocess==0.6.0
 Pygments==2.2.0
 pyparsing==2.2.0