diff --git a/build.gradle b/build.gradle
index ebb2fd6..d799c07 100644
--- a/build.gradle
+++ b/build.gradle
@@ -2,8 +2,8 @@ apply plugin: 'com.android.library'
 apply plugin: 'me.tatarka.retrolambda'
 
 android {
-    compileSdkVersion 25
-    buildToolsVersion "25.0.3"
+    compileSdkVersion compileSdk
+    buildToolsVersion buildTools
 
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8
@@ -23,12 +23,12 @@ dependencies {
     compile project(path: ':libraries:components')
 
     compile 'net.danlew:android.joda:2.9.9'
-    compile 'com.android.support:multidex:1.0.1'
-    compile 'io.reactivex:rxandroid:1.2.1'
-    compile 'io.reactivex:rxjava:1.3.2'
+    compile 'com.android.support:multidex:1.0.2'
+    compile "io.reactivex:rxandroid:$rxAndroidVersion"
+    compile "io.reactivex:rxjava:$rxJavaVersion"
 
-    provided 'com.android.support:appcompat-v7:25.3.1'
-    provided 'com.android.support:recyclerview-v7:25.3.1'
+    provided "com.android.support:appcompat-v7:$supportLibraryVersion"
+    provided "com.android.support:recyclerview-v7:$supportLibraryVersion"
 
     provided 'com.squareup.retrofit2:retrofit:2.3.0'
     provided('com.google.http-client:google-http-client-jackson2:1.23.0') {