diff --git a/requirements.txt b/requirements.txt
index 2cadd0e..859f3f3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -50,7 +50,7 @@ pexpect==4.2.1
 pickleshare==0.7.4
 Pillow==4.3.0
 prompt-toolkit==1.0.15
-protobuf==3.4.0
+protobuf==3.15.0
 ptyprocess==0.5.2
 pycurl==7.43.0
 pyglet==1.3.0