diff --git a/app/build.gradle b/app/build.gradle
index 630757a..1894977 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -29,14 +29,15 @@
             storePassword keystoreProperties['storePassword']
         }
     }
-    compileSdkVersion 25
-    buildToolsVersion "25.0.2"
+    compileSdkVersion rootProject.ext.compileSdkVersion
+    buildToolsVersion rootProject.ext.buildToolsVersion
     defaultConfig {
         applicationId "nl.digital_me.dummyandroidapp"
         minSdkVersion 10
-        targetSdkVersion 24
+        targetSdkVersion rootProject.ext.compileSdkVersion
         versionCode project.hasProperty('versionCode') ? project.property('versionCode') as int : 25
         versionName project.hasProperty('versionName') ? project.property('versionName') : "0.0.1"
+        multiDexEnabled true
     }
     dexOptions {
         maxProcessCount 1
@@ -73,8 +74,9 @@
 }
 
 dependencies {
-    compile fileTree(dir: 'libs', include: ['*.jar'])
+    //compile fileTree(dir: 'libs', include: ['*.jar'])
     testCompile 'junit:junit:4.12'
-    compile 'com.android.support:appcompat-v7:25.1.0'
+    compile "com.android.support:appcompat-v7:${rootProject.ext.supportLibVersion}"
     compile 'com.android.support:design:25.3.1'
+    compile 'com.android.support:multidex:1.0.2'
 }
diff --git a/build.gradle b/build.gradle
index 74b2ab0..64a5bac 100644
--- a/build.gradle
+++ b/build.gradle
@@ -18,6 +18,14 @@
     }
 }
 
+//This block encapsulates custom properties and makes them available to all
+//modules in the project.
+ext {
+  compileSdkVersion = 26
+  buildToolsVersion = "26.0.2"
+  supportLibVersion = "26.0.2"
+}
+
 task clean(type: Delete) {
     delete rootProject.buildDir
 }