diff --git a/cli.js b/cli.js
index fbe3170..b802040 100644
--- a/cli.js
+++ b/cli.js
@@ -4,6 +4,7 @@ import path from 'path';
 import { s3upload, purgeCache } from './index.js';
 import { debugLog } from "./utils.js";
 
+
 async function start() {
   if (process.argv.length < 3) {
     console.log('USAGE: alt-upload source_path [cdn_path] [version] [sdk_version]');
diff --git a/s3upload.js b/s3upload.js
index cb35cc4..0a7f70c 100644
--- a/s3upload.js
+++ b/s3upload.js
@@ -5,12 +5,14 @@ import { PromisePool } from '@supercharge/promise-pool';
 import path from 'path';
 import fs from 'fs';
 import {debugLog as debugLog_, hashFile, walk} from "./utils.js";
+import { createGzipFileBuffer } from "./zip.js";
 const debugLog = (...args) => debugLog_('S3', ...args);
 
 const AWS_KEY_ID = process.env['AWS_KEY_ID'];
 const SECRET_ACCESS_KEY = process.env['AWS_SECRET_ACCESS_KEY'];
 const BUCKET = process.env['AWS_BUCKET'];
 const ENDPOINT = process.env['AWS_ENDPOINT'];
+const compressionExtensions = [".dll"];
 
 const s3 = new S3({
   credentials: {
@@ -47,7 +49,17 @@ async function _upload(data, cdnPath, contentType) {
   }
 }
 
-async function uploadFile(filePath, cdnPath, attempt = 0) {
+/**
+ * Check the file extension for occurrence in the array
+ * @param {string} filePath - Path to the source file
+ * @param {array} allowedExtensions - Extensions
+ */
+function filterFilesByExtension(filePath, allowedExtensions) {
+  const fileExtension = path.extname(filePath).toLowerCase();  
+  return allowedExtensions.includes(fileExtension);
+}
+
+async function uploadFile(filePath, cdnPath, attempt = 0, gzipBuffer = {}) {
   debugLog('Upload file', filePath, 'to', cdnPath, 'attempt', attempt);
   try {
     const size = (await fs.promises.stat(filePath)).size;
@@ -60,7 +72,10 @@ async function uploadFile(filePath, cdnPath, attempt = 0) {
         Key: cdnPath
       }));
 
-      if (+head.ContentLength === size) {
+      if (+head.ContentLength === size) {      
+        if(filterFilesByExtension(filePath, compressionExtensions)) {
+          uploadGzipFile(filePath, cdnPath, 0, gzipBuffer);
+        }        
         return true;
       }
 
@@ -79,6 +94,42 @@ async function uploadFile(filePath, cdnPath, attempt = 0) {
   return false;
 }
 
+async function uploadGzipFile(filePath, cdnPath, attempt = 0, gzipBuffer = {}) {
+  debugLog('Upload gzip file', filePath, 'to', cdnPath, 'attempt', attempt);
+
+  const cdnPathGz = cdnPath + '.gz';
+  const filePathGz = filePath + '.gz';
+
+  try {
+    const sizeGz = gzipBuffer.length;
+    const contentType = 'application/gzip';
+    if (await _upload(gzipBuffer, cdnPathGz, contentType)) {
+      console.log(`Uploaded '${filePathGz}' to '${cdnPathGz}'`);
+  
+      const head = await s3.send(new HeadObjectCommand({
+        Bucket: BUCKET,
+        Key: cdnPathGz
+      }));
+  
+      if (+head.ContentLength === sizeGz) {
+        return true;
+      }
+  
+      console.error(`Uploaded gzip file size doesnt match. Local size: ${sizeGz}. Uploaded size: ${head.ContentLength}`)
+    }
+    console.error(`Error uploading '${filePathGz}' to '${cdnPathGz}'`);
+  } catch(e) {
+    console.error(e);
+  }
+
+  if (attempt < 3) {
+    return uploadGzipFile(filePath, cdnPath, attempt + 1);
+  }
+
+  console.log('Failed to upload', filePathGz, 'to', cdnPathGz, 'after 3 attempts');
+  return false;
+}
+
 async function uploadDir(dirPath, cdnPath, version, sdkVersion) {
   dirPath = path.resolve(dirPath);
   debugLog('Upload dir', dirPath, 'to', cdnPath, version, sdkVersion);
@@ -86,6 +137,7 @@ async function uploadDir(dirPath, cdnPath, version, sdkVersion) {
   const files = await walk(dirPath);
   const hashes = { };
   const sizes = { };
+  const gzipBuffer = { };
 
   let result = true;
 
@@ -93,7 +145,9 @@ async function uploadDir(dirPath, cdnPath, version, sdkVersion) {
 
   console.log(files);
 
+  let filesInfosForServer = [];
   for (let i = 0; i < files.length; ++i) {
+
     const file = files[i];
 
     const stats = fs.statSync(file);
@@ -102,16 +156,34 @@ async function uploadDir(dirPath, cdnPath, version, sdkVersion) {
       const key = (cdnPath.length > 0 ? (cdnPath + '/') : '') + filePath;
   
       hashes[filePath] = await hashFile(file);
-      sizes[filePath] = stats.size;
+      sizes[filePath] = stats.size;      
+      
+      let fileInfo = {
+        path: "",
+        size: 0,
+        sha1: "",
+        encoding: {},
+      }  
       
-      uploadQueue.push({ file, key });
+      fileInfo.path = filePath;
+      fileInfo.size = stats.size;
+      fileInfo.sha1 = hashes[filePath];
+
+      let gzipBuffer = {};
+      if(filterFilesByExtension(filePath, compressionExtensions)) {
+        gzipBuffer = await createGzipFileBuffer(file);    
+        fileInfo.encoding["gz"] = gzipBuffer.length;
+      } 
+      uploadQueue.push({ file, key, gzipBuffer });
+
+      filesInfosForServer.push(fileInfo);
     }
   }
 
   console.log(uploadQueue);
 
   const { results, errors } = await PromisePool.for(uploadQueue).withConcurrency(10).process(async queueItem => {
-    return await uploadFile(queueItem.file, queueItem.key);
+    return await uploadFile(queueItem.file, queueItem.key, 0, queueItem.gzipBuffer);
   });
 
   for (let i = 0; i < results.length; ++i) {
@@ -123,9 +195,9 @@ async function uploadDir(dirPath, cdnPath, version, sdkVersion) {
   if (version) {
     debugLog('Generate update.json', version);
     const updateData = JSON.stringify({
-      latestBuildNumber: -1,
       version: version,
       sdkVersion: sdkVersion || undefined,
+      files: filesInfosForServer,
       hashList: hashes,
       sizeList: sizes
     });
diff --git a/zip.js b/zip.js
new file mode 100644
index 0000000..2c710fa
--- /dev/null
+++ b/zip.js
@@ -0,0 +1,59 @@
+import fs from 'fs';
+import zlib from 'zlib';
+import { promisify } from 'util';
+import { pipeline, PassThrough  } from 'stream';
+import { debugLog } from "./utils.js";
+
+const pipe = promisify(pipeline);
+
+/**
+ * Archiving a file by gzip
+ * @param {string} source - Path to the source file
+ * @param {string} destination - Path to the compressed file
+ */
+async function gzipFile(source, destination) {
+  try {
+    const sourceStream = fs.createReadStream(source);
+    const gzipStream = zlib.createGzip();
+    const destinationStream = fs.createWriteStream(destination);
+
+    await pipe(sourceStream, gzipStream, destinationStream);
+    debugLog(`Archiving completed: ${destination}`);
+  } catch (error) {
+    console.error(`Error archiving a file ${source}:`, error);
+  }
+}
+
+/**
+ * Archiving a file by gzip in memory without file
+ * @param {string} source - Path to the source file
+ */
+export async function createGzipFileBuffer(source) {
+  try {
+    const sourceStream = fs.createReadStream(source);
+    const gzipStream = zlib.createGzip();
+    const passThrough = new PassThrough();
+
+    return new Promise((resolve, reject) => {
+      gzipStream.on('error', reject);
+      gzipStream.on('end', () => {
+      });
+
+      let compressedChunks = [];
+      passThrough.on('data', (chunk) => {
+        compressedChunks.push(chunk);
+      });
+      
+      passThrough.on('end', () => {
+        const compressedData = Buffer.concat(compressedChunks);
+        resolve(compressedData);
+      });
+
+      sourceStream.pipe(gzipStream)
+      gzipStream.pipe(passThrough);
+    });
+  } catch (error) {
+    console.error(`Error archiving a file ${source}:`, error);
+  }
+  return null;
+}