diff --git a/app/build.gradle b/app/build.gradle
index 38f7fd18..58b361cd 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -3,7 +3,7 @@ apply plugin: 'kotlin-android'
 
 android {
     compileSdkVersion = 27
-    buildToolsVersion '27.0.3'
+    // buildToolsVersion '28.0.2'
     defaultConfig {
         applicationId = 'com.tutpro.baresip'
         minSdkVersion 21
diff --git a/build.gradle b/build.gradle
index 88d52ef7..b97cfaca 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,13 +1,13 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 
 buildscript {
-    ext.kotlin_version = '1.2.51'
+    ext.kotlin_version = '1.2.71'
     repositories {
         jcenter()
         google()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.1.4'
+        classpath 'com.android.tools.build:gradle:3.2.1'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
 
         // NOTE: Do not place your application dependencies here; they belong
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index ccd36596..62e6cbb1 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,7 +1,8 @@
-#Wed May 16 08:30:21 EEST 2018
+#Wed Oct 24 23:04:59 EEST 2018
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.4-all.zip
-distributionSha256Sum=7a2c66d1a78f811d5f37d14630ad21cec5e77a2a4dc61e787e2257a6341016ce
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.6-all.zip
+distributionSha256Sum=9af7345c199f1731c187c96d3fe3d31f5405192a42046bafa71d846c3d9adacb
+