diff --git a/app-android/app/build.gradle b/app-android/app/build.gradle
index 190f87b..d94309f 100644
--- a/app-android/app/build.gradle
+++ b/app-android/app/build.gradle
@@ -2,12 +2,12 @@ apply plugin: 'com.android.application'
 
 android {
     compileSdkVersion 23
-    buildToolsVersion "23.0.2"
+    buildToolsVersion '25.0.0'
 
     defaultConfig {
         applicationId "at.bitfire.gfxtablet"
         minSdkVersion 14
-        targetSdkVersion 22
+        targetSdkVersion 23
     }
 
     buildTypes {
diff --git a/app-android/build.gradle b/app-android/build.gradle
index 0209e1e..40adbc4 100644
--- a/app-android/build.gradle
+++ b/app-android/build.gradle
@@ -2,14 +2,21 @@
 buildscript {
     repositories {
         jcenter()
+        mavenCentral()
+        maven {
+            url 'https://maven.google.com/'
+            name 'Google'
+        }
+        google()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:1.2.3'
+        classpath 'com.android.tools.build:gradle:2.3.0'
     }
 }
 allprojects {
     repositories {
         jcenter()
+        google()
     }
 }
 
diff --git a/app-android/gradle/wrapper/gradle-wrapper.properties b/app-android/gradle/wrapper/gradle-wrapper.properties
index 0c71e76..6884819 100644
--- a/app-android/gradle/wrapper/gradle-wrapper.properties
+++ b/app-android/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
-#Wed Apr 10 15:27:10 PDT 2013
+#Sun Nov 25 18:58:34 CET 2018
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-2.2.1-all.zip
+distributionUrl=https://services.gradle.org/distributions/gradle-4.3-all.zip