diff --git a/buildman/buildman_pb/buildman.proto b/buildman/buildman_pb/buildman.proto
index 429bdb5841..97e9443e49 100644
--- a/buildman/buildman_pb/buildman.proto
+++ b/buildman/buildman_pb/buildman.proto
@@ -39,6 +39,12 @@ message BuildPack {
   string pull_token = 8;
   string push_token = 9;
   repeated string tag_names = 10;
+  BaseImage base_image = 11;
+
+  message BaseImage {
+    string username = 1;
+    string password = 2;
+  }
 
   message GitPackage {
     string url = 1;
@@ -56,13 +62,13 @@ message HeartbeatResponse {
 
 message LogMessageRequest {
   string job_jwt = 1;
-  string timestamp = 2;
-  string phase = 3;
-  google.protobuf.Struct json_data = 4;
+  int32 sequence_number = 2;
+  string log_message = 3;
+  string phase = 4;
 }
 message LogMessageResponse {
   bool succeeded = 1;
-  string timestamp = 2;
+  int32 sequence_number = 2;
 }
 
 message CachedTagRequest {