diff --git a/build.gradle b/build.gradle
index 2d58854..6cddfd7 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,25 +1,23 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 
 buildscript {
-    ext.kotlin_version = '1.3.61'
+
+    ext.kotlin_version = '1.5.21'
+
     repositories {
         google()
-        jcenter()
-
+        mavenCentral()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.5.2'
+        classpath 'com.android.tools.build:gradle:7.0.0'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
-        classpath 'com.jfrog.bintray.gradle:gradle-bintray-plugin:1.8.4'
-        classpath "com.github.dcendents:android-maven-gradle-plugin:2.1"
     }
 }
 
 allprojects {
     repositories {
         google()
-        jcenter()
-
+        mavenCentral()
     }
 }
 
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index 2ef3358..804681e 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-5.4.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.0.2-all.zip
diff --git a/linegraph/build.gradle b/linegraph/build.gradle
index 0eb0b1f..aed8ac5 100644
--- a/linegraph/build.gradle
+++ b/linegraph/build.gradle
@@ -1,16 +1,12 @@
 apply plugin: 'com.android.library'
 apply plugin: 'kotlin-android'
-apply plugin: 'kotlin-android-extensions'
-apply plugin: 'com.jfrog.bintray'
-apply plugin: 'com.github.dcendents.android-maven'
+apply plugin: 'maven-publish'
 
 android {
-    compileSdkVersion 29
+    compileSdkVersion 30
     defaultConfig {
         minSdkVersion 14
-        targetSdkVersion 29
-        versionCode 1
-        versionName "1.0"
+        targetSdkVersion 30
 
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
         consumerProguardFiles 'consumer-rules.pro'
@@ -28,65 +24,9 @@ android {
 
 }
 
-
-task generateSourcesJar(type: Jar) {
-    from android.sourceSets.main.java.srcDirs
-    classifier 'sources'
-}
-
-task generateJavadocs(type: Javadoc) {
-    source = android.sourceSets.main.java.srcDirs
-    classpath += project.files(android.getBootClasspath()
-            .join(File.pathSeparator))
-}
-
-task generateJavadocsJar(type: Jar) {
-    from generateJavadocs.destinationDir
-    classifier 'javadoc'
-}
-
-generateJavadocsJar.dependsOn generateJavadocs
-
-artifacts {
-    archives generateJavadocsJar
-    archives generateSourcesJar
-}
-tasks.withType(Javadoc).all {
-    enabled = false
-}
-group = 'ir.farshid_roohi'
-version = '0.1.3'
-
-bintray {
-    user = 'xxxx'
-    key = 'xxxx'
-    pkg {
-
-        repo = 'LineGraph'
-        name = 'LineGraph'
-        userOrg = ''
-
-        version {
-            name = '0.1.3'
-            desc = 'Line Graph Android'
-            released = new Date()
-            vcsTag = '0.1.3'
-        }
-
-        licenses = ['Apache-2.0']
-        vcsUrl = 'https://github.com/FarshidRoohi/LineGraph'
-        websiteUrl = 'http://farshid-roohi.ir'
-    }
-    configurations = ['archives']
-}
-
-
 dependencies {
     implementation fileTree(dir: 'libs', include: ['*.jar'])
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
-    implementation 'androidx.appcompat:appcompat:1.1.0'
-    implementation 'androidx.core:core-ktx:1.1.0'
-    testImplementation 'junit:junit:4.12'
-    androidTestImplementation 'androidx.test:runner:1.2.0'
-    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
+    implementation 'androidx.appcompat:appcompat:1.3.1'
+    implementation 'androidx.core:core-ktx:1.6.0'
 }
diff --git a/sample/build.gradle b/sample/build.gradle
index 85898b7..9cc3f5f 100644
--- a/sample/build.gradle
+++ b/sample/build.gradle
@@ -1,15 +1,12 @@
 apply plugin: 'com.android.application'
-
 apply plugin: 'kotlin-android'
 
-apply plugin: 'kotlin-android-extensions'
-
 android {
-    compileSdkVersion 29
+    compileSdkVersion 30
     defaultConfig {
         applicationId "ir.farshid_roohi.graph"
         minSdkVersion 14
-        targetSdkVersion 29
+        targetSdkVersion 30
         versionCode 1
         versionName "1.0"
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
@@ -25,13 +22,10 @@ android {
 dependencies {
     implementation fileTree(dir: 'libs', include: ['*.jar'])
     implementation"org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
-    implementation 'androidx.appcompat:appcompat:1.1.0'
-    implementation 'androidx.core:core-ktx:1.1.0'
+    implementation 'androidx.appcompat:appcompat:1.3.1'
+    implementation 'androidx.core:core-ktx:1.6.0'
     implementation 'androidx.cardview:cardview:1.0.0'
-    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
-    testImplementation 'junit:junit:4.12'
-    androidTestImplementation 'androidx.test:runner:1.2.0'
-    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
+    implementation 'androidx.constraintlayout:constraintlayout:2.1.0'
 
     implementation project(":linegraph")
 }
diff --git a/sample/src/main/java/ir/farshid_roohi/graph/MainActivity.kt b/sample/src/main/java/ir/farshid_roohi/graph/MainActivity.kt
index 478bd2b..6773e66 100644
--- a/sample/src/main/java/ir/farshid_roohi/graph/MainActivity.kt
+++ b/sample/src/main/java/ir/farshid_roohi/graph/MainActivity.kt
@@ -5,7 +5,6 @@ import android.os.Bundle
 import androidx.appcompat.app.AppCompatActivity
 import ir.farshid_roohi.linegraph.ChartEntity
 import ir.farshid_roohi.linegraph.LineChart
-import kotlinx.android.synthetic.main.activity_main.*
 
 class MainActivity : AppCompatActivity() {
 
@@ -20,6 +19,8 @@ class MainActivity : AppCompatActivity() {
             add(firstChartEntity)
             add(secondChartEntity)
         }
+
+        val lineChart = findViewById<LineChart>(R.id.lineChart)
         lineChart.setLegend(legendArr)
         lineChart.setList(list)
     }