diff --git a/protos/bottle/core/v1/bottle.proto b/protos/bottle/core/v1/bottle.proto
index 3b8c355..d84ff5c 100644
--- a/protos/bottle/core/v1/bottle.proto
+++ b/protos/bottle/core/v1/bottle.proto
@@ -10,7 +10,7 @@ import "bottle/inventory/v1/events.proto";
 import "bottle/support/v1/events.proto";
 
 message Bottle {
-  int64 timestamp = 1;
+  string created_at = 1;
   string request_id = 2;
   string source = 3;