diff --git a/requirements.txt b/requirements.txt
index c9e689d..7abd259 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -28,7 +28,7 @@ pexpect==4.2.1
 pickleshare==0.7.4
 Pillow==3.4.2
 prompt-toolkit==1.0.13
-protobuf==3.4.0
+protobuf==3.15.0
 psutil==5.3.1
 ptyprocess==0.5.1
 Pygments==2.2.0