diff --git a/.drone.yml b/.drone.yml
index 6848968..10cba54 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -1,3 +1,6 @@
+workspace:
+  path: /go/src/github.com/appleboy/gorush
+
 pipeline:
   # restore the cache from an sftp server
   restore_cache:
@@ -21,7 +24,7 @@ pipeline:
     when:
       status: [ success, failure ]
       matrix:
-        GO_VERSION: 1.7.3
+        GO_VERSION: 1.7.4
 
   gtalk:
     image: appleboy/drone-gtalk
@@ -30,7 +33,7 @@ pipeline:
     when:
       status: [ success, failure ]
       matrix:
-        GO_VERSION: 1.7.3
+        GO_VERSION: 1.7.4
 
   facebook:
     image: appleboy/drone-facebook
@@ -39,7 +42,7 @@ pipeline:
     when:
       status: [ success, failure ]
       matrix:
-        GO_VERSION: 1.7.3
+        GO_VERSION: 1.7.4
 
   telegram:
     image: appleboy/drone-telegram
@@ -48,7 +51,7 @@ pipeline:
     when:
       status: [ success, failure ]
       matrix:
-        GO_VERSION: 1.7.3
+        GO_VERSION: 1.7.4
 
   # rebuild the cache on the sftp server
   rebuild_cache:
@@ -59,16 +62,13 @@ pipeline:
     when:
       branch: master
       matrix:
-        GO_VERSION: 1.7.3
+        GO_VERSION: 1.7.4
 
 services:
   redis:
     image: redis:alpine
 
-workspace:
-  path: /go/src/github.com/appleboy/gorush
-
 matrix:
   GO_VERSION:
-    - 1.7.3
-    - 1.6.3
+    - 1.7.4
+    - 1.6.4
diff --git a/.travis.yml b/.travis.yml
index c20aedc..ca42af0 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,9 +6,8 @@ services:
   - docker
 
 go:
-  - 1.5.4
-  - 1.6.3
-  - 1.7.3
+  - 1.6.4
+  - 1.7.4
   - tip
 
 cache:
@@ -39,13 +38,13 @@ script:
 
 after_success:
   - bash <(curl -s https://codecov.io/bash) -f .cover/coverage.txt
-  # deploy from master
-  - if [ "$TRAVIS_BRANCH" == "master" ] && [ "$TRAVIS_GO_VERSION" == "1.7.3" ] && [ "$TRAVIS_PULL_REQUEST" == "false" ]; then
-    docker login -u="$DOCKER_USERNAME" -p="$DOCKER_PASSWORD";
-    make docker_deploy tag=latest;
-    fi
-  # deploy from tag
-  - if [ "$TRAVIS_GO_VERSION" == "1.7.3" ] && [ "$TRAVIS_PULL_REQUEST" == "false" ] && [ "$TRAVIS_TAG" != "" ]; then
-    docker login -u="$DOCKER_USERNAME" -p="$DOCKER_PASSWORD";
-    make docker_deploy tag=$TRAVIS_TAG;
-    fi
+  # # deploy from master
+  # - if [ "$TRAVIS_BRANCH" == "master" ] && [ "$TRAVIS_GO_VERSION" == "1.7.3" ] && [ "$TRAVIS_PULL_REQUEST" == "false" ]; then
+  #   docker login -u="$DOCKER_USERNAME" -p="$DOCKER_PASSWORD";
+  #   make docker_deploy tag=latest;
+  #   fi
+  # # deploy from tag
+  # - if [ "$TRAVIS_GO_VERSION" == "1.7.3" ] && [ "$TRAVIS_PULL_REQUEST" == "false" ] && [ "$TRAVIS_TAG" != "" ]; then
+  #   docker login -u="$DOCKER_USERNAME" -p="$DOCKER_PASSWORD";
+  #   make docker_deploy tag=$TRAVIS_TAG;
+  #   fi
diff --git a/gorush/notification.go b/gorush/notification.go
index 7169f56..f7433ab 100644
--- a/gorush/notification.go
+++ b/gorush/notification.go
@@ -287,7 +287,7 @@ func iosAlertDictionary(payload *payload.Payload, req PushNotification) *payload
 
 // GetIOSNotification use for define iOS notificaiton.
 // The iOS Notification Payload
-// ref: https://developer.apple.com/library/ios/documentation/NetworkingInternet/Conceptual/RemoteNotificationsPG/Chapters/TheNotificationPayload.html
+// ref: https://developer.apple.com/library/content/documentation/NetworkingInternet/Conceptual/RemoteNotificationsPG/PayloadKeyReference.html#//apple_ref/doc/uid/TP40008194-CH17-SW1
 func GetIOSNotification(req PushNotification) *apns.Notification {
 	notification := &apns.Notification{
 		ApnsID: req.ApnsID,