diff --git a/build.gradle b/build.gradle
index d5fc17c..1bfb52f 100644
--- a/build.gradle
+++ b/build.gradle
@@ -11,7 +11,7 @@ buildscript {
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
         classpath "com.getkeepsafe.dexcount:dexcount-gradle-plugin:3.0.1"
         if (PLUGIN_ENABLE.toBoolean()) {
-            classpath "com.github.qq549631030:android-junk-code:1.3.3"
+            classpath "com.github.qq549631030:android-junk-code:1.3.4"
         }
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
diff --git a/library/build.gradle b/library/build.gradle
index f73dc2b..628af8e 100644
--- a/library/build.gradle
+++ b/library/build.gradle
@@ -6,7 +6,7 @@ buildscript {
     }
     dependencies {
         classpath 'com.vanniktech:gradle-maven-publish-plugin:0.18.0'
-        classpath "com.gradle.publish:plugin-publish-plugin:1.2.0"
+        classpath "com.gradle.publish:plugin-publish-plugin:1.3.0"
     }
 }
 
diff --git a/library/gradle.properties b/library/gradle.properties
index 87ebbb2..565a06a 100644
--- a/library/gradle.properties
+++ b/library/gradle.properties
@@ -1,7 +1,7 @@
 #project
 GROUP=com.github.qq549631030
 POM_ARTIFACT_ID=android-junk-code
-VERSION_NAME=1.3.3
+VERSION_NAME=1.3.4
 POM_PACKAGING=jar
 
 POM_NAME=AndroidJunkCode
diff --git a/library/src/main/groovy/cn/hx/plugin/junkcode/task/AndroidJunkCodeTask.groovy b/library/src/main/groovy/cn/hx/plugin/junkcode/task/AndroidJunkCodeTask.groovy
index 568e6b9..e4a8c44 100644
--- a/library/src/main/groovy/cn/hx/plugin/junkcode/task/AndroidJunkCodeTask.groovy
+++ b/library/src/main/groovy/cn/hx/plugin/junkcode/task/AndroidJunkCodeTask.groovy
@@ -41,7 +41,7 @@ abstract class AndroidJunkCodeTask extends DefaultTask {
             for (int i = 0; i < config.packageCount; i++) {
                 String packageName
                 if (config.packageCreator) {
-                    def packageNameBuilder = new StringBuffer()
+                    def packageNameBuilder = new StringBuilder()
                     config.packageCreator.execute(new Tuple2(i, packageNameBuilder))
                     packageName = packageNameBuilder.toString()
                 } else {
diff --git a/library/src/main/groovy/cn/hx/plugin/junkcode/task/GenerateJunkCodeTask.groovy b/library/src/main/groovy/cn/hx/plugin/junkcode/task/GenerateJunkCodeTask.groovy
index 9f78c4e..085248b 100644
--- a/library/src/main/groovy/cn/hx/plugin/junkcode/task/GenerateJunkCodeTask.groovy
+++ b/library/src/main/groovy/cn/hx/plugin/junkcode/task/GenerateJunkCodeTask.groovy
@@ -54,7 +54,7 @@ abstract class GenerateJunkCodeTask extends DefaultTask {
             for (int i = 0; i < config.packageCount; i++) {
                 String packageName
                 if (config.packageCreator) {
-                    def packageNameBuilder = new StringBuffer()
+                    def packageNameBuilder = new StringBuilder()
                     config.packageCreator.execute(new Tuple2(i, packageNameBuilder))
                     packageName = packageNameBuilder.toString()
                 } else {