diff --git a/angular-toggle-switch.js b/angular-toggle-switch.js
index eabf75a..564a491 100644
--- a/angular-toggle-switch.js
+++ b/angular-toggle-switch.js
@@ -22,7 +22,6 @@
       replace: true,
       require:'ngModel',
       scope: {
-        disabled: '@',
         onLabel: '@',
         offLabel: '@',
         knobLabel: '@'
@@ -55,6 +54,10 @@
           }
         });
 
+        attrs.$observe('disabled', function(val){
+          scope.disabled = val;
+        });
+
         ngModelCtrl.$formatters.push(function(modelValue){
           return modelValue;
         });
diff --git a/bower.json b/bower.json
index 7f2cbd6..829fb76 100644
--- a/bower.json
+++ b/bower.json
@@ -11,8 +11,8 @@
     "url": "https://github.com/cgarvis/angular-toggle-switch.git"
   },
   "devDependencies": {
-    "angular": ">=1.0",
-    "angular-mocks": ">=1.0"
+    "angular": "~1.4.0",
+    "angular-mocks": "~1.4.0"
   },
   "ignore": [
     "**/.*",
@@ -20,5 +20,8 @@
     "karma.conf.js",
     "package.json",
     ".travis.yml"
-  ]
+  ],
+  "resolutions": {
+    "angular": "~1.4.0"
+  }
 }