diff --git a/packages/sdk-js/package.json b/packages/sdk-js/package.json
index 8fae4c0..c6d6396 100644
--- a/packages/sdk-js/package.json
+++ b/packages/sdk-js/package.json
@@ -4,7 +4,7 @@
     "type": "git",
     "url": "git+https://github.com/catalyst-network/protocol.git"
   },
-  "version": "0.0.4",
+  "version": "0.0.5",
   "description": "Catalyst Protocol SDK-JS",
   "main": "src/index.js",
   "scripts": {
diff --git a/src/Deltas.proto b/src/Deltas.proto
index 96211b5..9387ba1 100644
--- a/src/Deltas.proto
+++ b/src/Deltas.proto
@@ -41,4 +41,5 @@ message Delta {
 	repeated Transaction.CoinbaseEntry coinbase_entries = 7; // one per active worker
 	bytes state_root = 8; // the hash of the state root
 	int64 delta_number = 9; // the consecutive delta number
+	int64 gas_used = 10; // the gas used in the delta
 }
diff --git a/src/IPPN.proto b/src/IPPN.proto
index c73a636..d3e0a2d 100644
--- a/src/IPPN.proto
+++ b/src/IPPN.proto
@@ -32,14 +32,17 @@ message PeerNeighborsResponse {
     repeated Peer.PeerId peers = 1; // Random subset of a nodes peer db.
 }
 
-message PingRequest { }
+message PingRequest { 
+}
 
-message PingResponse { }
+message PingResponse { 
+}
 
 message LatestDeltaHashRequest { }
 
 message LatestDeltaHashResponse {
-	Deltas.DeltaIndex result = 1; // K given del
+	bool isSync = 1;
+	Deltas.DeltaIndex deltaIndex = 2; // K given del
 }
 
 message DeltaHistoryRequest {
@@ -48,5 +51,5 @@ message DeltaHistoryRequest {
 }
 
 message DeltaHistoryResponse {
-    repeated Deltas.DeltaIndex result = 1; // K given del
+    repeated Deltas.DeltaIndex deltaIndex = 1; // K given del
 }
\ No newline at end of file