diff --git a/requirements.txt b/requirements.txt
index 2a6df78..4039a68 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -26,7 +26,7 @@ Jinja2==2.9.5
 MarkupSafe==0.23
 oauth2client==4.0.0
 ply==3.8
-protobuf==3.5.0.post1
+protobuf==3.15.0
 pyasn1==0.1.9
 pyasn1-modules==0.0.8
 python-firebase==1.2