diff --git a/requirements.txt b/requirements.txt
index c2ff549..60aa1dd 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -66,7 +66,7 @@ pexpect==4.2.1
 pickleshare==0.7.4
 Pillow==6.2.0
 prompt-toolkit==1.0.15
-protobuf==3.6.1
+protobuf==3.15.0
 ptyprocess==0.5.2
 py-applescript==1.0.1
 py2app==0.14