diff --git a/src/index.js b/src/index.js
index d2209ed..b2ac4fb 100644
--- a/src/index.js
+++ b/src/index.js
@@ -26,14 +26,14 @@ var generatePackage = function(websiteJSON, iconsDir, certData, pKeyData, interm
 
   // website.json
   var websiteContent = new Buffer(JSON.stringify(websiteJSON));
-  manifest['website.json'] = utils.sha1(websiteContent);
+  manifest['website.json'] = utils.sha512(websiteContent);
   zip.file('website.json', websiteContent);
 
   // icon.iconset
   var icons = zip.folder('icon.iconset'),
     addIconFile = function(name, content) {
       content = typeof content === 'string' ? fs.readFileSync(content) : content;
-      manifest['icon.iconset/' + name] = utils.sha1(content);
+      manifest['icon.iconset/' + name] = utils.sha512(content);
       icons.file(name, content);
     };
   if (typeof iconsDir === 'object') {
diff --git a/src/utils.js b/src/utils.js
index b6ed80b..45bbbe5 100644
--- a/src/utils.js
+++ b/src/utils.js
@@ -9,9 +9,12 @@ module.exports = {
     }
     return number + ""; // always return a string
   },
-  sha1: function (content) {
-    var shasum = crypto.createHash('sha1');
+  sha512: function (content) {
+    var shasum = crypto.createHash('sha512');
     shasum.update(content);
-    return shasum.digest('hex');
+    return {
+      "hashType": "sha512",
+      "hashValue": shasum.digest('hex')
+    };
   }
 };
diff --git a/test/utils.test.js b/test/utils.test.js
index 58e3885..3a1ba33 100644
--- a/test/utils.test.js
+++ b/test/utils.test.js
@@ -22,8 +22,8 @@ describe('test zeroFill', function() {
   });
 });
 
-describe('test sha1', function() {
+describe('test sha512', function() {
   test('it works', function() {
-    expect(pushUtils.sha1('itworks')).toBe('fe077c8079ace921b8f9bd00d7e50e049acfda94');
+    expect(pushUtils.sha512('itworks')).toEqual({"hashType": "sha512", "hashValue": "ff3470c61d4e3f66e69bf472fd48ff67b42be150625aa0d825f0fa86dd7cb6c01e54f0c810b9208371ae3295cf892ae051e93455a041dcdafcf2cffb5d2a245a"});
   });
 });
\ No newline at end of file