diff --git a/requirements.txt b/requirements.txt
index fe88946..0f92255 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -57,7 +57,7 @@ pexpect==4.7.0
 pickleshare==0.7.5
 prometheus-client==0.7.1
 prompt-toolkit==2.0.9
-protobuf==3.9.0
+protobuf==3.15.0
 ptyprocess==0.6.0
 pyarrow==0.14.1
 pycodestyle==2.5.0