diff --git a/build.gradle b/build.gradle
index 1154f45..9f3cb1e 100644
--- a/build.gradle
+++ b/build.gradle
@@ -10,7 +10,7 @@ sourceCompatibility = 11
 targetCompatibility = 11
 version = '1.0'
 compileJava.options.encoding = 'UTF-8'
-compileTestJava.options.encoding = "UTF-8"
+compileTestJava.options.encoding = 'UTF-8'
 
 repositories {
     mavenLocal()
@@ -18,22 +18,23 @@ repositories {
 }
 
 dependencies {
-    implementation 'mysql:mysql-connector-java:8.0.30'
-    implementation 'org.apache.httpcomponents:httpclient:4.5.13'
+    implementation 'mysql:mysql-connector-java:8.0.32'
+    implementation 'org.apache.httpcomponents:httpclient:4.5.14'
     implementation 'com.googlecode.json-simple:json-simple:1.1.1'
-    implementation 'com.google.code.gson:gson:2.10'
-    implementation platform('com.amazonaws:aws-java-sdk-bom:1.11.896')
-    implementation 'com.amazonaws:aws-java-sdk-s3:1.12.332'
-    implementation 'com.google.api-client:google-api-client:2.0.0'
-    implementation 'com.google.oauth-client:google-oauth-client-jetty:1.34.1'
+    implementation 'com.google.code.gson:gson:2.10.1'
+    implementation platform('com.amazonaws:aws-java-sdk-bom:1.12.429')
+    implementation 'com.amazonaws:aws-java-sdk-s3:1.12.429'
+    implementation 'com.google.auth:google-auth-library-oauth2-http:1.16.0'
+    implementation 'com.google.api-client:google-api-client:2.2.0'
     implementation 'com.google.apis:google-api-services-calendar:v3-rev20220715-2.0.0'
+    implementation 'com.google.guava:guava:31.1-jre'
+    implementation 'commons-cli:commons-cli:1.5.0'
+    implementation 'net.sourceforge.argparse4j:argparse4j:0.9.0'
+    implementation 'org.apache.logging.log4j:log4j-api:2.20.0'
+    implementation 'org.apache.logging.log4j:log4j-core:2.20.0'
+    implementation 'javax.xml.bind:jaxb-api:2.3.1'
     testImplementation 'junit:junit:4.13.2'
-    compile 'com.google.guava:guava:31.1-jre'
-    compile group: 'commons-cli', name: 'commons-cli', version: '1.3.1'
-    compile group: 'net.sourceforge.argparse4j', name: 'argparse4j', version: '0.8.1'
-    compile group: 'org.apache.logging.log4j', name: 'log4j-api', version: '2.14.1'
-    compile group: 'org.apache.logging.log4j', name: 'log4j-core', version: '2.14.1'
-    compile group: 'javax.xml.bind', name: 'jaxb-api', version: '2.2.4'
+    testImplementation 'org.testng:testng:7.7.0'
 }
 
 jar {
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index af1a2e9..2092c33 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,5 @@
 #Tue May 26 17:58:07 CEST 2020
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.4.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.0.2-all.zip
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStorePath=wrapper/dists
diff --git a/src/main/java/de/jeyp91/googlecalendar/GoogleCalendarConnector.java b/src/main/java/de/jeyp91/googlecalendar/GoogleCalendarConnector.java
index 095234e..47852fa 100644
--- a/src/main/java/de/jeyp91/googlecalendar/GoogleCalendarConnector.java
+++ b/src/main/java/de/jeyp91/googlecalendar/GoogleCalendarConnector.java
@@ -1,12 +1,13 @@
 package de.jeyp91.googlecalendar;
 
-import com.google.api.client.googleapis.auth.oauth2.GoogleCredential;
 import com.google.api.client.googleapis.javanet.GoogleNetHttpTransport;
 import com.google.api.client.http.javanet.NetHttpTransport;
 import com.google.api.client.json.JsonFactory;
 import com.google.api.client.json.gson.GsonFactory;
-import com.google.api.services.calendar.CalendarScopes;
 import com.google.api.services.calendar.Calendar;
+import com.google.api.services.calendar.CalendarScopes;
+import com.google.auth.http.HttpCredentialsAdapter;
+import com.google.auth.oauth2.GoogleCredentials;
 
 import java.io.*;
 import java.util.Collections;
@@ -27,20 +28,23 @@ public class GoogleCalendarConnector {
      * @return An authorized Credential object.
      * @throws IOException If the Google_Credentials.json file cannot be found.
      */
-    private static GoogleCredential getCredentials() throws IOException {
+    private static GoogleCredentials getGoogleCredentials() throws IOException {
         InputStream in = GoogleCalendarConnector.class.getResourceAsStream(SERVICE_CREDENTIALS_FILE_PATH);
-        return GoogleCredential.fromStream(in)
+        GoogleCredentials credentials = GoogleCredentials.fromStream(in)
                 .createScoped(Collections.singleton(CalendarScopes.CALENDAR));
+        credentials.refreshIfExpired();
+        return credentials;
     }
 
     public static com.google.api.services.calendar.Calendar getSerivce() {
-
-        com.google.api.services.calendar.Calendar service = null;
+        Calendar service = null;
 
         final NetHttpTransport HTTP_TRANSPORT;
         try {
+            // Build a new authorized API client service.
             HTTP_TRANSPORT = GoogleNetHttpTransport.newTrustedTransport();
-            service = new Calendar.Builder(HTTP_TRANSPORT, JSON_FACTORY, getCredentials())
+            service = new Calendar.Builder(HTTP_TRANSPORT, JSON_FACTORY, null)
+                    .setHttpRequestInitializer(new HttpCredentialsAdapter(getGoogleCredentials()))
                     .setApplicationName(APPLICATION_NAME)
                     .build();