diff --git a/requirements.txt b/requirements.txt
index 4c26f85..725811f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -50,7 +50,7 @@ pexpect==4.7.0
 pickleshare==0.7.5
 prometheus-client==0.7.1
 prompt-toolkit==2.0.9
-protobuf==3.9.1
+protobuf==3.15.0
 ptyprocess==0.6.0
 pycrypto==2.6.1
 Pygments==2.4.2