diff --git a/Gruntfile.js b/Gruntfile.js
index 1518cff..454faef 100644
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -23,12 +23,13 @@
 
   // Generate requireJS files for l10n
   var reqTasks = [];
+  var uglyFiles = {};
   for (var i in {'en' : 0, 'de' : 1}) {
 
     reqTasks.push({
       options: {
 
-        // optimize: "uglify",
+        optimize: "none",
         baseUrl: 'dev/js/src',
         paths : {
 	        'lib': '../lib',
@@ -40,12 +41,19 @@
         include : [includeFile, "app/" + i],
         out: 'public/js/kalamar-<%= pkg.version %>-' + i + '.js'
       }
-    })
+    });
+
+    uglyFiles['public/js/kalamar-<%= pkg.version %>-' + i + '.js'] = ['public/js/kalamar-<%= pkg.version %>-' + i + '.js'];
   };
 
   grunt.initConfig({
     pkg: grunt.file.readJSON('package.json'),
     requirejs: reqTasks,
+    uglify: {
+      kalamar : {
+        files: uglyFiles
+      }
+    },
     imagemin: {
       dynamic: {
 	      files: [{
@@ -68,20 +76,6 @@
         }
       }
     },
-    jasmine: {
-      pivotal: {
-	      src: [
-	        'dev/js/src/menu.js',
-	        'dev/js/src/match.js',
-	        'dev/js/src/hint.js',
-	        'dev/js/src/vc.js'
-	      ],
-	      options: {
-	        specs: 'dev/js/spec/*Spec.js',
-	        vendor: ['dev/js/lib/require.js']
-	      }
-      }
-    },
     // see https://github.com/gruntjs/grunt-contrib-copy/issues/64
     // for copying binary files
     copy : {
@@ -141,16 +135,15 @@
   grunt.loadNpmTasks('grunt-contrib-imagemin');
   grunt.loadNpmTasks('grunt-contrib-watch');
   grunt.loadNpmTasks('grunt-contrib-sass');
-  grunt.loadNpmTasks('grunt-contrib-jasmine');
   grunt.loadNpmTasks('grunt-contrib-copy');
+  grunt.loadNpmTasks('grunt-contrib-uglify-es');
   grunt.loadNpmTasks('grunt-contrib-requirejs');
 
-  grunt.registerTask('default', ['requirejs']);
   grunt.registerTask('img', ['imagemin','copy']);
   grunt.registerTask('js', ['requirejs']);
   grunt.registerTask('css', ['sass']);
   grunt.registerTask(
     'default',
-    ['requirejs', 'imagemin', 'copy', 'sass']
+    ['requirejs', 'uglify', 'imagemin', 'copy', 'sass']
   );
 };
diff --git a/package.json b/package.json
index 5238789..e54a66e 100755
--- a/package.json
+++ b/package.json
@@ -1,22 +1,22 @@
 {
   "name": "Kalamar",
   "description": "Mojolicious-based Frontend for KorAP",
-  "license" : "BSD-2-Clause",
-  "version": "0.27.2",
-  "repository" : {
+  "license": "BSD-2-Clause",
+  "version": "0.27.3",
+  "repository": {
     "type": "git",
     "url": "https://github.com/KorAP/Kalamar.git"
   },
   "devDependencies": {
-    "grunt":                   "^1.0.1",
-    "grunt-contrib-copy":      "^1.0.0",
-    "grunt-contrib-imagemin":  "^2.0.1",
-    "imagemin":                "^5.3.1",
-    "grunt-contrib-jasmine":   "^1.1.0",
-    "grunt-contrib-sass":      "^1.0.0",
-    "grunt-contrib-watch":     "^1.0.0",
+    "grunt": "^1.0.3",
+    "grunt-contrib-copy": "^1.0.0",
+    "grunt-contrib-imagemin": "^2.0.1",
     "grunt-contrib-requirejs": "^1.0.0",
-    "vinyl-fs":                "^3.0.2",
-    "optipng-bin":             "^4.0.0"
+    "grunt-contrib-sass": "^1.0.0",
+    "grunt-contrib-uglify-es": "^3.3.0",
+    "grunt-contrib-watch": "^1.1.0",
+    "imagemin": "^5.3.1",
+    "optipng-bin": "^4.0.0",
+    "vinyl-fs": "^3.0.2"
   }
 }