diff --git a/.travis.yml b/.travis.yml
index a397f3a7..48520890 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -18,6 +18,10 @@ cache:
         - $HOME/.gradle/caches/
         - $HOME/.gradle/wrapper/
 
+before_install:
+  - sudo pip install --upgrade pip
+  - sudo pip install six
+
 install:
     - echo no | npm install -g nativescript
     - tns usage-reporting disable
diff --git a/demo-ng/package.json b/demo-ng/package.json
index 89157620..f002721d 100644
--- a/demo-ng/package.json
+++ b/demo-ng/package.json
@@ -25,7 +25,7 @@
     "nativescript-angular": "^6.1.0",
     "nativescript-camera": "^4.0.2",
     "nativescript-imagepicker": "~6.0.4",
-    "nativescript-plugin-firebase": "file:../publish/package/nativescript-plugin-firebase-7.4.4.tgz",
+    "nativescript-plugin-firebase": "file:../publish/package/nativescript-plugin-firebase-7.4.5.tgz",
     "nativescript-theme-core": "~1.0.4",
     "reflect-metadata": "~0.1.10",
     "rxjs": "~6.0.0 || >=6.1.0",
diff --git a/demo-push/package.json b/demo-push/package.json
index e235c47f..03b935d5 100644
--- a/demo-push/package.json
+++ b/demo-push/package.json
@@ -9,7 +9,7 @@
     }
   },
   "dependencies": {
-    "nativescript-plugin-firebase": "file:../publish/package/nativescript-plugin-firebase-7.4.4.tgz",
+    "nativescript-plugin-firebase": "file:../publish/package/nativescript-plugin-firebase-7.4.5.tgz",
     "nativescript-theme-core": "^1.0.4",
     "nativescript-unit-test-runner": "^0.3.4",
     "tns-core-modules": "~4.2.0"
diff --git a/demo/package.json b/demo/package.json
index 0f700a94..1efbd139 100644
--- a/demo/package.json
+++ b/demo/package.json
@@ -10,7 +10,7 @@
   },
   "dependencies": {
     "firebase-functions": "^2.0.5",
-    "nativescript-plugin-firebase": "file:../publish/package/nativescript-plugin-firebase-7.4.4.tgz",
+    "nativescript-plugin-firebase": "file:../publish/package/nativescript-plugin-firebase-7.4.5.tgz",
     "nativescript-theme-core": "^1.0.4",
     "nativescript-unit-test-runner": "^0.3.4",
     "tns-core-modules": "~5.0.5"
diff --git a/src/firebase.ios.ts b/src/firebase.ios.ts
index ba08ff1c..b080b88f 100755
--- a/src/firebase.ios.ts
+++ b/src/firebase.ios.ts
@@ -308,12 +308,9 @@ if (typeof (FIRMessaging) !== "undefined" || useExternalPushProvider) {
 function getAppDelegate() {
   // Play nice with other plugins by not completely ignoring anything already added to the appdelegate
   if (application.ios.delegate === undefined) {
-    class UIApplicationDelegateImpl extends UIResponder implements UIApplicationDelegate {
-      public static ObjCProtocols = [UIApplicationDelegate];
 
-      // static new(): UIApplicationDelegateImpl {
-      //   return <UIApplicationDelegateImpl>super.new();
-      // }
+    @ObjCClass(UIApplicationDelegate)
+    class UIApplicationDelegateImpl extends UIResponder implements UIApplicationDelegate {
     }
 
     application.ios.delegate = UIApplicationDelegateImpl;
@@ -1223,7 +1220,7 @@ firebase.getValue = path => {
   return new Promise((resolve, reject) => {
     try {
       const where = path === undefined ? FIRDatabase.database().reference() : FIRDatabase.database().reference().childByAppendingPath(path);
-      const listener = where.observeSingleEventOfTypeWithBlockWithCancelBlock(
+      where.observeSingleEventOfTypeWithBlockWithCancelBlock(
           FIRDataEventType.Value,
           snapshot => {
             resolve(firebase.getCallbackData('ValueChanged', snapshot));
diff --git a/src/mlkit/mlkit-cameraview.ios.ts b/src/mlkit/mlkit-cameraview.ios.ts
index 3f8697f5..af75a72c 100644
--- a/src/mlkit/mlkit-cameraview.ios.ts
+++ b/src/mlkit/mlkit-cameraview.ios.ts
@@ -171,9 +171,8 @@ export abstract class MLKitCameraView extends MLKitCameraViewBase {
   abstract createSuccessListener(): any;
 }
 
+@ObjCClass(TNSMLKitCameraViewDelegate)
 class TNSMLKitCameraViewDelegateImpl extends NSObject implements TNSMLKitCameraViewDelegate {
-  public static ObjCProtocols = [TNSMLKitCameraViewDelegate];
-
   private owner: WeakRef<MLKitCameraView>;
   private resultCallback: (message: any) => void;
   private options?: any;
diff --git a/src/package.json b/src/package.json
index f1f6c7c4..7bd400bc 100644
--- a/src/package.json
+++ b/src/package.json
@@ -1,6 +1,6 @@
 {
   "name": "nativescript-plugin-firebase",
-  "version": "7.4.4",
+  "version": "7.4.5",
   "description": "Fire. Base. Firebase!",
   "main": "firebase",
   "typings": "index.d.ts",