diff --git a/build.gradle b/build.gradle
index aadfcec..99d0639 100644
--- a/build.gradle
+++ b/build.gradle
@@ -10,6 +10,7 @@ allprojects {
         } else {
             maven {url 'http://maven.aliyun.com/nexus/content/repositories/jcenter/'}
         }
+        google()
     }
 }
 
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index e64c9a1..40b025c 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-3.3-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.1-all.zip
diff --git a/shrinker/build.gradle b/shrinker/build.gradle
index 172238d..e1b31c0 100644
--- a/shrinker/build.gradle
+++ b/shrinker/build.gradle
@@ -3,7 +3,7 @@ apply plugin: 'groovy'
 dependencies {
     compile gradleApi()
     compile localGroovy()
-    compile 'com.android.tools.build:gradle:2.3.0'
+    compile 'com.android.tools.build:gradle:3.0.0'
     compile 'org.ow2.asm:asm:5.0.4'
     compile 'commons-io:commons-io:2.4'
 }
diff --git a/shrinker/gradle.properties b/shrinker/gradle.properties
index c77813b..715c2c6 100644
--- a/shrinker/gradle.properties
+++ b/shrinker/gradle.properties
@@ -1,4 +1,4 @@
-VERSION_NAME=0.1.5
+VERSION_NAME=0.2.1
 GROUP=net.yrom
 POM_PACKAGING=jar
 POM_DESCRIPTION=Inline constant fields of android R class by asm and transform-api