diff --git a/.travis.yml b/.travis.yml
index 29d3c5b..228dcd5 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,8 +4,8 @@ jdk: oraclejdk8
 
 env:
   global:
-    - ANDROID_API_LEVEL=28
-    - ANDROID_BUILD_TOOLS_VERSION=28.0.3
+    - ANDROID_API_LEVEL=30
+    - ANDROID_BUILD_TOOLS_VERSION=30.0.2
     - ANDROID_ABI=armeabi-v7a
 
 android:
@@ -20,8 +20,8 @@ android:
 
 before_install:
   - touch $HOME/.android/repositories.cfg
-  - yes | sdkmanager "platforms;android-28"
-  - yes | sdkmanager "build-tools;28.0.3"
+  - yes | sdkmanager "platforms;android-30"
+  - yes | sdkmanager "build-tools;30.0.2"
 
 before_cache:
   - rm -f  $HOME/.gradle/caches/modules-2/modules-2.lock
diff --git a/build.gradle b/build.gradle
index 277ddc3..0e351fd 100644
--- a/build.gradle
+++ b/build.gradle
@@ -6,7 +6,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.3.2'
+        classpath 'com.android.tools.build:gradle:4.0.1'
 
         // 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 a82e409..23aa690 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-4.10.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.1.1-all.zip
diff --git a/library/build.gradle b/library/build.gradle
index 912de58..bdde9c8 100644
--- a/library/build.gradle
+++ b/library/build.gradle
@@ -3,7 +3,7 @@ apply plugin: 'groovy'
 apply plugin: 'maven'
 
 buildscript {
-    ext.kotlin_version = '1.3.41'
+    ext.kotlin_version = '1.4.10'
 
     repositories {
         mavenCentral()
@@ -28,20 +28,15 @@ dependencies {
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
 
     // Rx
-    implementation 'io.reactivex.rxjava2:rxjava:2.2.8'
+    implementation 'io.reactivex.rxjava2:rxjava:2.2.19'
 
     // GSON
-    implementation 'com.google.code.gson:gson:2.8.5'
+    implementation 'com.google.code.gson:gson:2.8.6'
 
     // Testing
-    testImplementation 'junit:junit:4.12'
-    testImplementation 'org.mockito:mockito-core:2.27.0'
-    testImplementation "com.nhaarman.mockitokotlin2:mockito-kotlin:2.1.0"
-
-    testImplementation "cglib:cglib:2.2"
-    testImplementation('org.spockframework:spock-core:1.0-groovy-2.4') {
-        exclude group: 'junit'
-    }
+    testImplementation 'junit:junit:4.13'
+    testImplementation "com.nhaarman.mockitokotlin2:mockito-kotlin:2.2.0"
+    testImplementation "org.mockito:mockito-inline:3.5.11"
 }
 
 compileKotlin {
diff --git a/sample/build.gradle b/sample/build.gradle
index 4c9bd51..77b802b 100644
--- a/sample/build.gradle
+++ b/sample/build.gradle
@@ -7,13 +7,13 @@ buildscript {
 }
 
 android {
-    compileSdkVersion 28
-    buildToolsVersion "28.0.3"
+    compileSdkVersion 30
+    buildToolsVersion "30.0.2"
 
     defaultConfig {
         applicationId "de.rheinfabrik.heimdall"
-        minSdkVersion 15
-        targetSdkVersion 28
+        minSdkVersion 21
+        targetSdkVersion 30
         versionCode 1
         versionName "1.0"
     }
@@ -28,8 +28,8 @@ android {
 dependencies {
 
     // Android
-    implementation 'androidx.appcompat:appcompat:1.0.2'
-    implementation 'androidx.recyclerview:recyclerview:1.0.0'
+    implementation 'androidx.appcompat:appcompat:1.2.0'
+    implementation 'androidx.recyclerview:recyclerview:1.1.0'
     implementation 'androidx.cardview:cardview:1.0.0'
 
     // Heimdall
@@ -37,11 +37,11 @@ dependencies {
 
     // Rx
     implementation 'io.reactivex.rxjava2:rxandroid:2.1.1'
-    implementation 'io.reactivex.rxjava2:rxjava:2.2.7'
+    implementation 'io.reactivex.rxjava2:rxjava:2.2.19'
     implementation 'com.trello.rxlifecycle3:rxlifecycle-components:3.0.0'
 
     // Serialization
-    implementation 'com.google.code.gson:gson:2.8.5'
+    implementation 'com.google.code.gson:gson:2.8.6'
     implementation 'org.parceler:parceler-api:0.2.16'
 
     // Network