diff --git a/requirements.txt b/requirements.txt
index 588a213..db4b039 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
 gtfs-realtime-bindings
-protobuf==3.20.*
+protobuf==4.23.*
 protobuf3-to-dict
 requests