diff --git a/build.gradle b/build.gradle
index ed7b2dbf..eb0f4808 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,3 +1,5 @@
+apply from: 'dependencies.gradle'
+
 buildscript {
     repositories {
         mavenCentral()
@@ -21,7 +23,6 @@ allprojects {
     }
 
     ext {
-        supportLibraryDependency = 'com.android.support:support-v4:25.3.1'
         isLibrary = false
     }
 }
@@ -31,8 +32,8 @@ subprojects {
         ext.pluginContainer = project.getPlugins()
         if(ext.pluginContainer.hasPlugin("com.android.application") || ext.pluginContainer.hasPlugin("com.android.library")) {
             android {
-                compileSdkVersion 25
-                buildToolsVersion '25.0.2'
+                compileSdkVersion versions.compile_sdk
+                buildToolsVersion versions.build_tools
 
                 android {
                     lintOptions {
@@ -41,8 +42,8 @@ subprojects {
                 }
 
                 defaultConfig {
-                    minSdkVersion 9
-                    targetSdkVersion 25
+                    minSdkVersion versions.min_sdk
+                    targetSdkVersion versions.target_sdk
                     versionCode 191
                     versionName "1.9.1"
                 }
diff --git a/core/build.gradle b/core/build.gradle
index 968a37f1..cc4dabe6 100644
--- a/core/build.gradle
+++ b/core/build.gradle
@@ -9,5 +9,5 @@ ext {
 }
 
 dependencies {
-    compile supportLibraryDependency
+    compile libraries.support_v4
 }
diff --git a/dependencies.gradle b/dependencies.gradle
new file mode 100644
index 00000000..2a4c20bc
--- /dev/null
+++ b/dependencies.gradle
@@ -0,0 +1,19 @@
+ext.versions = [
+        compile_sdk   : 25,
+        min_sdk       : 9,
+        target_sdk    : 25,
+        build_tools   : "25.0.2",
+        support_lib   : "25.3.1",
+        zxing         : "3.3.0",
+        barcodescanner: "1.9.1"
+]
+
+ext.libraries = [
+        support_v4          : "com.android.support:support-v4:$versions.support_lib",
+        appcompat_v7        : "com.android.support:appcompat-v7:$versions.support_lib",
+        design_support      : "com.android.support:design:$versions.support_lib",
+        zxing_core          : "com.google.zxing:core:$versions.zxing",
+        barcodescanner_core : "me.dm7.barcodescanner:core:$versions.barcodescanner",
+        barcodescanner_zbar : "me.dm7.barcodescanner:zbar:$versions.barcodescanner",
+        barcodescanner_zxing: "me.dm7.barcodescanner:zxing:$versions.barcodescanner"
+]
\ No newline at end of file
diff --git a/zbar-sample/build.gradle b/zbar-sample/build.gradle
index a31ca32e..c5e0ed38 100644
--- a/zbar-sample/build.gradle
+++ b/zbar-sample/build.gradle
@@ -2,15 +2,14 @@ apply plugin: 'com.android.application'
 
 dependencies {
     //compile project(":zbar")
-    compile 'me.dm7.barcodescanner:zbar:1.9.1'
-    compile supportLibraryDependency
-    compile 'com.android.support:appcompat-v7:25.3.1'
-    compile 'com.android.support:design:25.3.1'
+    compile libraries.barcodescanner_zbar
+    compile libraries.support_v4
+    compile libraries.appcompat_v7
+    compile libraries.design_support
 }
 
 android {
     defaultConfig {
         applicationId "${project.group}.zbar.sample"
     }
-    buildToolsVersion '25.0.2'
 }
diff --git a/zbar/build.gradle b/zbar/build.gradle
index bf8ff06c..ee1c61ef 100644
--- a/zbar/build.gradle
+++ b/zbar/build.gradle
@@ -10,6 +10,6 @@ ext {
 
 dependencies {
     //compile project(":core")
-    compile 'me.dm7.barcodescanner:core:1.9.1'
+    compile libraries.barcodescanner_core
     compile fileTree(dir: 'libs', include: '*.jar')
 }
diff --git a/zxing-sample/build.gradle b/zxing-sample/build.gradle
index b967c1fa..87bc8adb 100644
--- a/zxing-sample/build.gradle
+++ b/zxing-sample/build.gradle
@@ -2,10 +2,10 @@ apply plugin: 'com.android.application'
 
 dependencies {
 //    compile project(":zxing")
-    compile 'me.dm7.barcodescanner:zxing:1.9.1'
-    compile supportLibraryDependency
-    compile 'com.android.support:appcompat-v7:25.3.1'
-    compile 'com.android.support:design:25.3.1'
+    compile libraries.barcodescanner_zxing
+    compile libraries.support_v4
+    compile libraries.appcompat_v7
+    compile libraries.design_support
 }
 
 android {
diff --git a/zxing/build.gradle b/zxing/build.gradle
index b57516b6..0496a8e3 100644
--- a/zxing/build.gradle
+++ b/zxing/build.gradle
@@ -10,6 +10,6 @@ ext {
 
 dependencies {
     //compile project(":core")
-    compile 'me.dm7.barcodescanner:core:1.9.1'
-    compile 'com.google.zxing:core:3.3.0'
+    compile libraries.barcodescanner_core
+    compile libraries.zxing_core
 }