diff --git a/requirements.txt b/requirements.txt
index 4c00969..8d9baf6 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,7 +4,7 @@ chardet==3.0.4
 cryptography==3.2
 gtfs-realtime-bindings==0.0.6
 idna==2.10
-protobuf==3.12.2
+protobuf==3.15.0
 pycparser==2.20
 requests==2.24.0
 six==1.15.0