diff --git a/build.gradle b/build.gradle
index f805511..44a8674 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,9 +1,9 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 
 buildscript {
-    ext.kotlin_version = '1.1.3'
+    ext.kotlin_version = '1.1.3-2'
     repositories {
-        maven { url 'http://maven.aliyun.com/nexus/content/groups/public/' }
+        maven { url 'https://dl.google.com/dl/android/maven2/' }
         jcenter()
     }
     dependencies {