diff --git a/README.md b/README.md
index 4dde9ab..94e9592 100644
--- a/README.md
+++ b/README.md
@@ -29,7 +29,7 @@ allprojects {
 
 #####2. Add the dependency to a module 
 ```groovy
-compile 'com.sumup:merchant-api:1.1'
+compile 'com.sumup:merchant-api:1.1.1'
 ```
 
 #####3. Provide a callback activity
diff --git a/app/build.gradle b/app/build.gradle
index 4b93c65..b1ff85b 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,20 +1,19 @@
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion 21
-    buildToolsVersion "21.1.2"
+    compileSdkVersion 24
+    buildToolsVersion '25.0.1'
 
     defaultConfig {
         minSdkVersion 15
-        targetSdkVersion 21
-        versionCode 3
-        versionName "1.1"
+        targetSdkVersion 24
+        versionCode 4
+        versionName "1.1.1"
     }
 }
 
 dependencies {
-    compile 'com.android.support:appcompat-v7:22.2.1'
-
-    compile 'com.sumup:merchant-api:1.1'
+    compile 'com.android.support:appcompat-v7:24.2.1'
 
+    compile 'com.sumup:merchant-api:1.1.1'
 }
\ No newline at end of file
diff --git a/build.gradle b/build.gradle
index 705b649..b63f3e8 100644
--- a/build.gradle
+++ b/build.gradle
@@ -5,7 +5,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:1.3.1'
+        classpath 'com.android.tools.build:gradle:2.3.1'
     }
 }
 
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index dbe0a40..a7fc26b 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
-#Wed Jul 15 18:10:15 CEST 2015
+#Tue Apr 11 10:08:08 CEST 2017
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-2.5-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-3.3-all.zip