diff --git a/lib/parser.js b/lib/parser.js
index f71ee46..d9a429d 100644
--- a/lib/parser.js
+++ b/lib/parser.js
@@ -78,8 +78,55 @@ var readers = {
   'double': readDouble,
   'float': readFloat,
   'slotArray': readSlotArray,
+  'mapChunkBulk': readMapChunkBulk,
 };
 
+function readMapChunkBulk (buffer, offset) {
+  var cursor = offset + 6;
+  if (cursor > buffer.length) return null;
+  var chunkCount = buffer.readInt16BE(buffer, offset);
+  var dataSize = buffer.readInt32BE(buffer, offset + 2);
+
+  var endCursor = cursor + 1 + dataSize + 12 * chunkCount;
+  if (endCursor > buffer.length) return null;
+
+  var skyLightSent = !!buffer.readInt8(buffer, cursor);
+  cursor += 1;
+
+  var compressedChunkDataEnd = cursor + dataSize;
+  var compressedChunkData = buffer.slice(cursor, compressedChunkDataEnd);
+  cursor = compressedChunkDataEnd;
+
+  var meta = [];
+  var i, chunkX, chunkZ, primaryBitMap, addBitMap;
+  for (i = 0; i < chunkCount; ++i) {
+    chunkX = buffer.readInt32BE(buffer, cursor);
+    cursor += 4;
+    chunkZ = buffer.readInt32BE(buffer, cursor);
+    cursor += 4;
+    primaryBitMap = buffer.readUInt16BE(buffer, cursor);
+    cursor += 2;
+    addBitMap = buffer.readUInt16BE(buffer, cursor);
+    cursor += 2;
+
+    meta.push({
+      chunkX: chunkX,
+      chunkZ: chunkZ,
+      primaryBitMap: primaryBitMap,
+      addBitMap: addBitMap,
+    });
+  }
+
+  return {
+    value: {
+      skyLightSent: skyLightSent,
+      compressedChunkData: compressedChunkData,
+      meta: meta,
+    },
+    size: endCursor - offset,
+  };
+}
+
 function readString (buffer, offset) {
   var results = readShort(buffer, offset);
   if (! results) return null;
diff --git a/packets.json b/packets.json
index c803ab7..97ad22a 100644
--- a/packets.json
+++ b/packets.json
@@ -133,6 +133,26 @@
       "type": "short"
     }
   ],
+  "56": [
+    {
+      "name": "dummy",
+      "type": "mapChunkBulk"
+    }
+  ],
+  "103": [
+    {
+      "name": "windowId",
+      "type": "byte"
+    },
+    {
+      "name": "slotId",
+      "type": "short"
+    },
+    {
+      "name": "slot",
+      "type": "slot"
+    }
+  ],
   "104": [
     {
       "name": "windowId",