diff --git a/library/libs/.gitkeep b/library/libs/.gitkeep
new file mode 100644
index 0000000..e69de29
diff --git a/samples/build.gradle b/samples/build.gradle
index 82f8e94..cdfe727 100644
--- a/samples/build.gradle
+++ b/samples/build.gradle
@@ -22,6 +22,6 @@ android {
 dependencies {
     compile project(':library')
     compile fileTree(dir: 'libs', include: ['*.jar'])
-    compile 'com.android.support:support-v4:21.+'
-    compile 'com.android.support:appcompat-v7:+'
+    compile 'com.android.support:support-v4:21.0.3'
+    compile 'com.android.support:appcompat-v7:21.0.3'
 }
diff --git a/samples/libs/.gitkeep b/samples/libs/.gitkeep
new file mode 100644
index 0000000..e69de29