diff --git a/.gitignore b/.gitignore
index 39fb081..55a038f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,6 +3,8 @@
 /local.properties
 /.idea/workspace.xml
 /.idea/libraries
+/.idea/codeStyles/Project.xml
+/.idea/vcs.xml
 .DS_Store
 /build
 /captures
diff --git a/app/build.gradle b/app/build.gradle
index 17a0186..b29d745 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,8 +1,8 @@
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion 26
-    buildToolsVersion "26.0.2"
+    compileSdkVersion 28
+    buildToolsVersion '28.0.3'
     defaultConfig {
         applicationId "tellh.com.recyclertreeview"
         minSdkVersion 14
@@ -20,13 +20,13 @@ android {
 }
 
 dependencies {
-    compile fileTree(dir: 'libs', include: ['*.jar'])
-    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
+    implementation fileTree(dir: 'libs', include: ['*.jar'])
+    testImplementation('com.android.support.test.espresso:espresso-core:2.2.2', {
         exclude group: 'com.android.support', module: 'support-annotations'
     })
-    compile 'com.android.support:appcompat-v7:26.1.0'
-    compile 'com.android.support:recyclerview-v7:26.1.0'
-    testCompile 'junit:junit:4.12'
-    compile project(path: ':recyclertreeview-lib')
+    implementation 'androidx.appcompat:appcompat:1.0.0'
+    implementation 'androidx.recyclerview:recyclerview:1.0.0'
+    testImplementation 'junit:junit:4.12'
+    implementation project(path: ':recyclertreeview-lib')
 //    compile 'com.github.TellH:RecyclerTreeView:1.2.0'
 }
diff --git a/app/src/main/java/tellh/com/recyclertreeview/MainActivity.java b/app/src/main/java/tellh/com/recyclertreeview/MainActivity.java
index 5fc3861..960959e 100644
--- a/app/src/main/java/tellh/com/recyclertreeview/MainActivity.java
+++ b/app/src/main/java/tellh/com/recyclertreeview/MainActivity.java
@@ -1,9 +1,11 @@
 package tellh.com.recyclertreeview;
 
 import android.os.Bundle;
-import android.support.v7.app.AppCompatActivity;
-import android.support.v7.widget.LinearLayoutManager;
-import android.support.v7.widget.RecyclerView;
+
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.recyclerview.widget.RecyclerView;
+import androidx.recyclerview.widget.LinearLayoutManager;
+
 import android.view.Menu;
 import android.view.MenuItem;
 import android.widget.ImageView;
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index 869486d..64eb07f 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.v7.widget.RecyclerView xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.recyclerview.widget.RecyclerView
+    xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     android:id="@+id/rv"
diff --git a/build.gradle b/build.gradle
index 987db10..be3d6f6 100644
--- a/build.gradle
+++ b/build.gradle
@@ -3,11 +3,12 @@
 buildscript {
     repositories {
         jcenter()
+        google()
     }
     dependencies {
         //JitPack
         classpath 'com.github.dcendents:android-maven-gradle-plugin:1.4.1'
-        classpath 'com.android.tools.build:gradle:3.0.1'
+        classpath 'com.android.tools.build:gradle:3.2.1'
     }
 }
 
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index fc9b829..8417de0 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
-#Mon Dec 28 10:00:20 PST 2015
+#Fri Dec 07 11:41:38 JST 2018
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.6-all.zip
diff --git a/recyclertreeview-lib/build.gradle b/recyclertreeview-lib/build.gradle
index ac459f5..546e57a 100644
--- a/recyclertreeview-lib/build.gradle
+++ b/recyclertreeview-lib/build.gradle
@@ -2,8 +2,8 @@ apply plugin: 'com.android.library'
 apply plugin: 'com.github.dcendents.android-maven'
 group='com.github.tellh'
 android {
-    compileSdkVersion 26
-    buildToolsVersion "26.0.2"
+    compileSdkVersion 28
+    buildToolsVersion '28.0.3'
 
     defaultConfig {
         minSdkVersion 14
@@ -23,9 +23,9 @@ android {
 }
 
 dependencies {
-    compile fileTree(dir: 'libs', include: ['*.jar'])
-    compile 'com.android.support:appcompat-v7:26.1.0'
-    compile 'com.android.support:recyclerview-v7:26.1.0'
+    testImplementation fileTree(dir: 'libs', include: ['*.jar'])
+    implementation 'androidx.appcompat:appcompat:1.0.0'
+    implementation 'androidx.recyclerview:recyclerview:1.0.0'
 }
 
 tasks.withType(JavaCompile) {
diff --git a/recyclertreeview-lib/src/main/java/tellh/com/recyclertreeview_lib/TreeNode.java b/recyclertreeview-lib/src/main/java/tellh/com/recyclertreeview_lib/TreeNode.java
index 02f6741..a05387f 100644
--- a/recyclertreeview-lib/src/main/java/tellh/com/recyclertreeview_lib/TreeNode.java
+++ b/recyclertreeview-lib/src/main/java/tellh/com/recyclertreeview_lib/TreeNode.java
@@ -1,6 +1,6 @@
 package tellh.com.recyclertreeview_lib;
 
-import android.support.annotation.NonNull;
+import androidx.annotation.NonNull;
 
 import java.util.ArrayList;
 import java.util.List;
diff --git a/recyclertreeview-lib/src/main/java/tellh/com/recyclertreeview_lib/TreeViewAdapter.java b/recyclertreeview-lib/src/main/java/tellh/com/recyclertreeview_lib/TreeViewAdapter.java
index 76738e0..dd2cc15 100644
--- a/recyclertreeview-lib/src/main/java/tellh/com/recyclertreeview_lib/TreeViewAdapter.java
+++ b/recyclertreeview-lib/src/main/java/tellh/com/recyclertreeview_lib/TreeViewAdapter.java
@@ -1,10 +1,12 @@
 package tellh.com.recyclertreeview_lib;
 
 import android.os.Bundle;
-import android.support.annotation.NonNull;
-import android.support.annotation.Nullable;
-import android.support.v7.util.DiffUtil;
-import android.support.v7.widget.RecyclerView;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.recyclerview.widget.RecyclerView;
+import androidx.recyclerview.widget.DiffUtil;
+
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
diff --git a/recyclertreeview-lib/src/main/java/tellh/com/recyclertreeview_lib/TreeViewBinder.java b/recyclertreeview-lib/src/main/java/tellh/com/recyclertreeview_lib/TreeViewBinder.java
index aa55e3b..e1e2999 100644
--- a/recyclertreeview-lib/src/main/java/tellh/com/recyclertreeview_lib/TreeViewBinder.java
+++ b/recyclertreeview-lib/src/main/java/tellh/com/recyclertreeview_lib/TreeViewBinder.java
@@ -1,7 +1,8 @@
 package tellh.com.recyclertreeview_lib;
 
-import android.support.annotation.IdRes;
-import android.support.v7.widget.RecyclerView;
+import androidx.annotation.IdRes;
+import androidx.recyclerview.widget.RecyclerView;
+
 import android.view.View;