diff --git a/globallydynamic-server-lib/build.gradle b/globallydynamic-server-lib/build.gradle
index c92d04f..a518258 100644
--- a/globallydynamic-server-lib/build.gradle
+++ b/globallydynamic-server-lib/build.gradle
@@ -14,7 +14,7 @@ buildscript {
         classpath "org.jetbrains.dokka:dokka-gradle-plugin:0.10.1"
         classpath "com.github.gmazzo.buildconfig:com.github.gmazzo.buildconfig.gradle.plugin:3.0.3"
         classpath "com.github.ben-manes:gradle-versions-plugin:$versions.versionsplugin"
-        classpath "com.github.jengelman.gradle.plugins:shadow:$versions.shadowjar"
+        classpath "com.github.johnrengelman:shadow:$versions.shadowjar"
     }
 }
 
@@ -45,7 +45,7 @@ subprojects {
             mavenCentral()
         }
 
-        if (project.hasProperty('java')) {
+        if (project.hasProperty('kotlin')) {
             sourceCompatibility = rootProject.ext.sourceCompatibilityVersion
             targetCompatibility = rootProject.ext.targetCompatibilityVersion
 
diff --git a/globallydynamic-server-lib/deps.gradle b/globallydynamic-server-lib/deps.gradle
index 3e63438..c2d8ae0 100644
--- a/globallydynamic-server-lib/deps.gradle
+++ b/globallydynamic-server-lib/deps.gradle
@@ -4,7 +4,7 @@ def versions = [
         kotlin        : '1.8.21',
         jetty         : '9.4.27.v20200227',
         versionsplugin: '0.25.0',
-        shadowjar     : '4.0.4',
+        shadowjar     : '8.1.1',
         guava         : '30.1-jre',
         bundletool    : '1.11.2',
         gson          : '2.8.6',
diff --git a/globallydynamic-server-lib/gradle/gradle-mvn-push.gradle b/globallydynamic-server-lib/gradle/gradle-mvn-push.gradle
index 6716c1e..a5b8140 100644
--- a/globallydynamic-server-lib/gradle/gradle-mvn-push.gradle
+++ b/globallydynamic-server-lib/gradle/gradle-mvn-push.gradle
@@ -30,12 +30,12 @@ def getRepositoryPassword() {
 
 afterEvaluate { project ->
   task sourcesJar(type: Jar, dependsOn: classes) {
-    classifier = 'sources'
+    archiveClassifier = 'sources'
     from sourceSets.main.allSource
   }
 
   task javadocJar(type: Jar, dependsOn: javadoc) {
-    classifier = 'javadoc'
+    archiveClassifier = 'javadoc'
     from javadoc.destinationDir
   }
 
diff --git a/globallydynamic-server-lib/gradle/wrapper/gradle-wrapper.properties b/globallydynamic-server-lib/gradle/wrapper/gradle-wrapper.properties
index 070cb70..84a0b92 100644
--- a/globallydynamic-server-lib/gradle/wrapper/gradle-wrapper.properties
+++ b/globallydynamic-server-lib/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.6-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.2.1-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
diff --git a/globallydynamic-server-lib/server/build.gradle b/globallydynamic-server-lib/server/build.gradle
index 7805a1f..cce816b 100644
--- a/globallydynamic-server-lib/server/build.gradle
+++ b/globallydynamic-server-lib/server/build.gradle
@@ -9,17 +9,27 @@ task executableJar(type: ShadowJar) {
     if (project.hasProperty("archiveName")) {
         archiveName = "${project.property("archiveName")}"
     } else {
-        baseName = 'globallydynamic-server'
-        classifier = 'standalone'
+        archiveBaseName = 'globallydynamic-server'
+        archiveClassifier = 'standalone'
     }
     if (project.hasProperty("outputDir")) {
-        destinationDir = file(project.property("outputDir"))
+        destinationDirectory = file(project.property("outputDir"))
     }
     from sourceSets.main.output
     configurations = [project.configurations.runtimeClasspath]
     manifest {
         attributes 'Main-Class': 'com.jeppeman.globallydynamic.server.GloballyDynamicMainKt'
     }
+
+    /*
+    If one dependency jar is signed when making a fat jar,
+    all unsigned classes will be ignored by the Java runtime.
+    This causes the "Could not find or load main class"-error;
+    hence we exclude all signatures from the fat jar
+     */
+    exclude 'META-INF/*.RSA'
+    exclude 'META-INF/*.SF'
+    exclude 'META-INF/*.DSA'
 }
 
 task runExecutableJar(type: JavaExec) {