diff --git a/.travis.yml b/.travis.yml
index 025b1e7e..9cb2c6b5 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -19,8 +19,7 @@ android:
     components:
         - tools
         - android-27
-        - build-tools-26.0.2
-        - build-tools-27.0.0
+        - build-tools-27.0.2
 
 install:
     - >
diff --git a/build.gradle b/build.gradle
index 338af4a1..1c463ee3 100644
--- a/build.gradle
+++ b/build.gradle
@@ -5,6 +5,7 @@ buildscript {
         kotlinVersion = '1.2.0'
         minSdkVersion = 19
         sdkVersion = 27
+        buildToolsVersion = '27.0.2'
         supportLibraryVersion = '27.0.2'
         takisoftFixVersion = '27.0.2.0'
         playServicesVersion = '11.6.2'
diff --git a/core/build.gradle b/core/build.gradle
index 0b4cfa0f..6cf206f4 100644
--- a/core/build.gradle
+++ b/core/build.gradle
@@ -1,6 +1,7 @@
 apply plugin: 'com.android.library'
 
 android {
+    buildToolsVersion rootProject.buildToolsVersion
     compileSdkVersion rootProject.sdkVersion
 
     defaultConfig {
diff --git a/mobile/build.gradle b/mobile/build.gradle
index 1160705c..4c68cddb 100644
--- a/mobile/build.gradle
+++ b/mobile/build.gradle
@@ -14,6 +14,7 @@ def getCurrentFlavor() {
 }
 
 android {
+    buildToolsVersion rootProject.buildToolsVersion
     compileSdkVersion rootProject.sdkVersion
     defaultConfig {
         applicationId "com.github.shadowsocks"
diff --git a/plugin/build.gradle b/plugin/build.gradle
index 18db03de..2ac7df80 100644
--- a/plugin/build.gradle
+++ b/plugin/build.gradle
@@ -2,6 +2,7 @@ apply plugin: 'com.android.library'
 apply plugin: 'kotlin-android'
 
 android {
+    buildToolsVersion rootProject.buildToolsVersion
     compileSdkVersion rootProject.sdkVersion
 
     defaultConfig {