diff --git a/app/build.gradle b/app/build.gradle
index 4afa6a8..6396655 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -25,7 +25,6 @@ dependencies {
         exclude group: 'com.android.support', module: 'support-annotations'
     })
     compile 'com.android.support:appcompat-v7:24.1.1'
-    compile 'com.android.support.constraint:constraint-layout:1.0.0-alpha4'
     testCompile 'junit:junit:4.12'
     compile project(':flexlayout')
 }
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index e8f4dec..a446b54 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
     android:id="@+id/activity_main"
@@ -10,11 +10,7 @@
     <TextView
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:text="Hello World!"
-        app:layout_constraintBottom_toBottomOf="@+id/activity_main"
-        app:layout_constraintLeft_toLeftOf="@+id/activity_main"
-        app:layout_constraintRight_toRightOf="@+id/activity_main"
-        app:layout_constraintTop_toTopOf="@+id/activity_main" />
+        android:text="Hello World!" />
 
     <org.houxg.flexlayout.FlexLayout
         android:layout_width="wrap_content"
@@ -34,4 +30,4 @@
 
     </org.houxg.flexlayout.FlexLayout>
 
-</android.support.constraint.ConstraintLayout>
+</RelativeLayout>