diff --git a/app/build.gradle b/app/build.gradle
index f11728389..536765ef6 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -17,17 +17,21 @@ repositories {
     jcenter()
 }
 
+ext {
+    supportLibVersion = '25.0.1'
+}
+
 dependencies {
-    compile 'com.android.support:support-v4:25.0.1'
-    compile 'com.android.support:appcompat-v7:25.0.1'
-    compile 'com.android.support:gridlayout-v7:25.0.1'
-    compile 'com.android.support:support-annotations:25.0.1'
-    compile 'com.android.support:recyclerview-v7:25.0.1'
-    compile 'com.android.support:cardview-v7:25.0.1'
-    compile 'com.android.support:design:25.0.1'
-    compile 'com.android.support:support-vector-drawable:25.0.1'
+    compile "com.android.support:support-v4:${supportLibVersion}"
+    compile "com.android.support:appcompat-v7:${supportLibVersion}"
+    compile "com.android.support:gridlayout-v7:${supportLibVersion}"
+    compile "com.android.support:support-annotations:${supportLibVersion}"
+    compile "com.android.support:recyclerview-v7:${supportLibVersion}"
+    compile "com.android.support:cardview-v7:${supportLibVersion}"
+    compile "com.android.support:design:${supportLibVersion}"
+    compile "com.android.support:support-vector-drawable:${supportLibVersion}"
     compile 'com.android.support.constraint:constraint-layout:1.0.1'
-    compile 'com.android.support:palette-v7:25.0.1'
+    compile "com.android.support:palette-v7:${supportLibVersion}"
 
     compile 'com.nostra13.universalimageloader:universal-image-loader:1.9.5'
     compile 'com.google.zxing:core:3.2.1'
@@ -53,7 +57,7 @@ dependencies {
 
     testCompile "org.mockito:mockito-core:1.10.19"
 
-    androidTestCompile 'com.android.support:support-annotations:25.0.1'
+    androidTestCompile "com.android.support:support-annotations:${supportLibVersion}"
     androidTestCompile 'com.android.support.test:runner:0.5'
     androidTestCompile 'com.android.support.test:rules:0.5'
 }