diff --git a/apng_library/build.gradle b/apng_library/build.gradle
index 2f4296e..0a7f23f 100644
--- a/apng_library/build.gradle
+++ b/apng_library/build.gradle
@@ -28,7 +28,7 @@ android {
 }
 
 dependencies {
-    implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.3.5'
+    implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.3.7'
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
 
     implementation 'androidx.appcompat:appcompat:1.1.0'
diff --git a/app-test/build.gradle b/app-test/build.gradle
index 367a036..802bab2 100644
--- a/app-test/build.gradle
+++ b/app-test/build.gradle
@@ -35,12 +35,12 @@ android {
 
 dependencies {
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
-    implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.3.5'
+    implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.3.7'
 
     implementation 'androidx.appcompat:appcompat:1.1.0'
     implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
     implementation 'androidx.legacy:legacy-support-v4:1.0.0'
-    implementation 'com.google.android.material:material:1.2.0-alpha06'
+    implementation 'com.google.android.material:material:1.3.0-alpha01'
 
     testImplementation 'junit:junit:4.12'
     androidTestImplementation 'androidx.test:runner:1.2.0'
diff --git a/app-test/src/main/java/oupson/apngcreator/activities/MainActivity.kt b/app-test/src/main/java/oupson/apngcreator/activities/MainActivity.kt
index 7959b8f..67a3f83 100644
--- a/app-test/src/main/java/oupson/apngcreator/activities/MainActivity.kt
+++ b/app-test/src/main/java/oupson/apngcreator/activities/MainActivity.kt
@@ -25,7 +25,6 @@ import java.io.File
 
 class MainActivity : AppCompatActivity() {
     companion object {
-        @Suppress("unused")
         private const val TAG = "MainActivity"
     }
 
diff --git a/build.gradle b/build.gradle
index 2f2f455..20c40e3 100644
--- a/build.gradle
+++ b/build.gradle
@@ -8,7 +8,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.6.3'
+        classpath 'com.android.tools.build:gradle:4.0.0'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index b926ced..e41ef71 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
-#Thu Apr 02 11:29:23 CEST 2020
+#Tue Jun 16 22:41:01 CEST 2020
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-5.6.4-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.1.1-all.zip