diff --git a/build.gradle b/build.gradle
index 2cfcf08..4f1938b 100644
--- a/build.gradle
+++ b/build.gradle
@@ -5,7 +5,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.6.1'
+        classpath 'com.android.tools.build:gradle:4.2.1'
         classpath 'com.jfrog.bintray.gradle:gradle-bintray-plugin:1.7.3'
         classpath 'com.github.dcendents:android-maven-gradle-plugin:1.5'
     }
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index 1e21d31..9185224 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-6.2.2-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.7.1-all.zip
diff --git a/library/build.gradle b/library/build.gradle
index 4e1be01..6742fed 100644
--- a/library/build.gradle
+++ b/library/build.gradle
@@ -46,6 +46,11 @@ android {
     lintOptions {
         abortOnError false
     }
+    
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_7
+        targetCompatibility JavaVersion.VERSION_1_7
+    }
 }
 
 task checkstyle(type: Checkstyle) {
@@ -60,7 +65,8 @@ task checkstyle(type: Checkstyle) {
 
 dependencies {
     implementation fileTree(dir: 'libs', include: ['*.jar'])
-    implementation 'androidx.appcompat:appcompat:1.2.0' }
+    implementation 'androidx.appcompat:appcompat:1.3.0'
+}
 
 // Bintray installing and uploading scripts
 // Can be found here: https://raw.githubusercontent.com/nuuneoi/JCenter/master/installv1.gradle
@@ -110,7 +116,7 @@ install {
 
 if (project.hasProperty("android")) { // Android libraries
     task sourcesJar(type: Jar) {
-        classifier = 'sources'
+        archiveClassifier.set('sources')
         from android.sourceSets.main.java.srcDirs
     }
 
@@ -120,13 +126,13 @@ if (project.hasProperty("android")) { // Android libraries
     }
 } else { // Java libraries
     task sourcesJar(type: Jar, dependsOn: classes) {
-        classifier = 'sources'
+        archiveClassifier.set('sources')
         from sourceSets.main.allSource
     }
 }
 
 task javadocJar(type: Jar, dependsOn: javadoc) {
-    classifier = 'javadoc'
+    archiveClassifier.set('javadoc')
     from javadoc.destinationDir
 }
 
diff --git a/sample/build.gradle b/sample/build.gradle
index 1dc7da7..e54b4e6 100644
--- a/sample/build.gradle
+++ b/sample/build.gradle
@@ -24,6 +24,11 @@ android {
     packagingOptions {
         exclude 'LICENSE.txt'
     }
+
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_7
+        targetCompatibility JavaVersion.VERSION_1_7
+    }
 }
 
 task checkstyle(type: Checkstyle) {
@@ -38,13 +43,13 @@ task checkstyle(type: Checkstyle) {
 
 dependencies{
     implementation fileTree(dir: 'libs', include: ['*.jar'])
-    implementation 'androidx.appcompat:appcompat:1.1.0'
+    implementation 'androidx.appcompat:appcompat:1.3.0'
     implementation project(":library")
 
-    testImplementation 'junit:junit:4.12'
+    testImplementation 'junit:junit:4.13.2'
 
-    androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.0'
-    androidTestImplementation 'androidx.test.espresso:espresso-intents:3.1.0'
-    androidTestImplementation 'androidx.test:runner:1.1.0'
-    androidTestImplementation 'androidx.test:rules:1.1.0'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
+    androidTestImplementation 'androidx.test.espresso:espresso-intents:3.3.0'
+    androidTestImplementation 'androidx.test:runner:1.3.0'
+    androidTestImplementation 'androidx.test:rules:1.3.0'
 }
\ No newline at end of file