diff --git a/core/build.gradle b/core/build.gradle
index 29e215a..05828c3 100644
--- a/core/build.gradle
+++ b/core/build.gradle
@@ -2,14 +2,21 @@
 
 apply plugin: 'java'
 
-sourceCompatibility = 1.7
+//sourceCompatibility = 1.8
+java.sourceCompatibility = JavaVersion.VERSION_1_8
+java.targetCompatibility = JavaVersion.VERSION_1_8
+
+repositories {
+    mavenCentral()
+    google()
+}
 
 dependencies {
-    testImplementation 'com.fasterxml.jackson.core:jackson-databind:2.3.0'
-    testImplementation 'commons-io:commons-io:2.4'
-    testImplementation 'junit:junit:4.11'
+    testImplementation 'com.fasterxml.jackson.core:jackson-databind:2.17.0'
+    testImplementation 'commons-io:commons-io:2.7'
+    testImplementation 'junit:junit:4.13.2'
     testImplementation 'org.hamcrest:hamcrest-library:1.3'
-    testImplementation 'org.mockito:mockito-core:1.9.5'
+    testImplementation 'org.mockito:mockito-core:5.3.1'
 }
 
 jar {
diff --git a/core/src/test/java/io/keen/client/java/KeenClientTest.java b/core/src/test/java/io/keen/client/java/KeenClientTest.java
index e905a70..51ac1bb 100755
--- a/core/src/test/java/io/keen/client/java/KeenClientTest.java
+++ b/core/src/test/java/io/keen/client/java/KeenClientTest.java
@@ -6,11 +6,9 @@
 import org.junit.After;
 import org.junit.Before;
 import org.junit.BeforeClass;
-import org.junit.Ignore;
 import org.junit.Test;
 import org.mockito.ArgumentCaptor;
 
-import java.awt.*;
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Calendar;
@@ -34,7 +32,7 @@
 import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertNull;
 import static org.junit.Assert.fail;
-import static org.mockito.Matchers.any;
+import static org.mockito.ArgumentMatchers.any;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.when;
diff --git a/gradle/gradle-mvn-publish-java.gradle b/gradle/gradle-mvn-publish-java.gradle
index 533f18a..57a9228 100644
--- a/gradle/gradle-mvn-publish-java.gradle
+++ b/gradle/gradle-mvn-publish-java.gradle
@@ -1,10 +1,10 @@
 task javadocJar(type: Jar, dependsOn: javadoc) {
-    classifier = 'javadoc'
+    archiveClassifier = 'javadoc'
     from javadoc.destinationDir
 }
 
 task sourcesJar(type: Jar) {
-    classifier = 'sources'
+    archiveClassifier = 'sources'
     from sourceSets.main.allSource
 }
 
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index 442d913..17655d0 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.8.3-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.6-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists