diff --git a/android/build.gradle b/android/build.gradle
index 77ce66e..ad6a928 100644
--- a/android/build.gradle
+++ b/android/build.gradle
@@ -3,9 +3,10 @@
 buildscript {
     repositories {
         jcenter()
+        google()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:2.1.3'
+        classpath 'com.android.tools.build:gradle:3.1.3'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
@@ -15,6 +16,7 @@ buildscript {
 allprojects {
     repositories {
         jcenter()
+        google()
     }
 }
 
diff --git a/android/gradle.properties b/android/gradle.properties
index 13d64a5..ff53440 100644
--- a/android/gradle.properties
+++ b/android/gradle.properties
@@ -17,3 +17,5 @@ systemProp.https.proxyPort=8080
 systemProp.http.proxyHost=batproxy
 systemProp.https.proxyHost=batproxy
 systemProp.http.proxyPort=8080
+
+org.gradle.configureondemand=false
diff --git a/android/gradle/wrapper/gradle-wrapper.properties b/android/gradle/wrapper/gradle-wrapper.properties
index 4ba4622..87043e3 100644
--- a/android/gradle/wrapper/gradle-wrapper.properties
+++ b/android/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-2.14.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.7-all.zip
diff --git a/android/olm-sdk/build.gradle b/android/olm-sdk/build.gradle
index 9601c87..c114968 100644
--- a/android/olm-sdk/build.gradle
+++ b/android/olm-sdk/build.gradle
@@ -3,8 +3,8 @@ import org.apache.tools.ant.taskdefs.condition.Os
 apply plugin: 'com.android.library'
 
 android {
-    compileSdkVersion 21
-    buildToolsVersion '21.1.2'
+    compileSdkVersion 27
+    buildToolsVersion '27.0.3'
 
     defaultConfig {
         minSdkVersion 11
@@ -76,10 +76,9 @@ android {
 
     libraryVariants.all { variant ->
         variant.outputs.each { output ->
-            def outputFile = output.outputFile
-            if (outputFile != null && outputFile.name.endsWith('.aar')) {
-                def fileName = outputFile.name.replace(".aar", "-${version}.aar")
-                output.outputFile = new File(outputFile.parent, fileName)
+            def outputFile = output.outputFileName
+            if (outputFile != null && outputFile.endsWith('.aar')) {
+                output.outputFileName = outputFile.replace(".aar", "-${version}.aar")
             }
         }
     }
@@ -119,12 +118,9 @@ def gitRevisionDate() {
 }
 
 dependencies {
-    compile fileTree(include: ['*.jar'], dir: 'libs')
-    compile 'com.android.support:appcompat-v7:21.+'
-
-    testCompile 'junit:junit:4.12'
-    androidTestCompile 'junit:junit:4.12'
-    androidTestCompile 'com.android.support:support-annotations:21.0.0'
-    androidTestCompile 'com.android.support.test:runner:0.5'
-    androidTestCompile 'com.android.support.test:rules:0.5'
+    testImplementation 'junit:junit:4.12'
+    androidTestImplementation 'junit:junit:4.12'
+    androidTestImplementation 'com.android.support:support-annotations:27.1.1'
+    androidTestImplementation 'com.android.support.test:runner:1.0.2'
+    androidTestImplementation 'com.android.support.test:rules:1.0.2'
 }