diff --git a/requirements.txt b/requirements.txt
index 58d13e8..6718f37 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -67,7 +67,7 @@ Pillow==5.4.1
 pluggy==0.13.1
 prometheus-client==0.5.0
 prompt-toolkit==2.0.7
-protobuf==3.6.1
+protobuf==3.15.0
 ptyprocess==0.6.0
 py==1.8.1
 pycodestyle==2.5.0