diff --git a/app/build.gradle b/app/build.gradle
index 54bd182..d94333d 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -3,7 +3,7 @@ apply plugin: 'kotlin-android'
 
 android {
     compileSdkVersion 25
-    buildToolsVersion "25.0.2"
+    buildToolsVersion "25.0.3"
 
     defaultConfig {
         applicationId "net.nullsum.audinaut"
@@ -31,14 +31,15 @@ android {
 
 dependencies {
     compile 'com.esotericsoftware:kryo:4.0.0'
-    compile 'com.android.support:design:25.2.0'
+    compile "com.android.support:design:$android_support_version"
     compile 'com.sothree.slidinguppanel:library:3.3.1'
-    compile 'com.squareup.okhttp3:okhttp:3.6.0'
-    compile 'org.jetbrains.kotlin:kotlin-stdlib:1.1.2-2'
+    compile 'com.squareup.okhttp3:okhttp:3.8.0'
+    compile "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
 }
 
 buildscript {
     ext.kotlin_version = '1.1.2-2'
+    ext.android_support_version = '25.3.1'
     repositories {
         mavenCentral()
     }