diff --git a/build.gradle b/build.gradle
index 6ba11ea..83734d1 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,5 +1,5 @@
 buildscript {
-    ext.kotlin_version = "1.7.0"
+    ext.kotlin_version = "1.7.20"
     ext.CI_PROJECT_ID = System.env.CI_PROJECT_ID
 
     repositories {
@@ -26,6 +26,10 @@ repositories {
 
 
 java {
+    // https://stackoverflow.com/questions/21904269/configure-gradle-to-publish-sources-and-javadoc
+    withSourcesJar()
+    withJavadocJar()
+
     toolchain {
         languageVersion = JavaLanguageVersion.of(11)
     }
@@ -61,12 +65,6 @@ compileJava.options.debugOptions.debugLevel = "source,lines,vars"
 compileTestFixturesJava.options.debugOptions.debugLevel = "source,lines,vars"
 compileTestJava.options.debugOptions.debugLevel = "source,lines,vars"
 
-// https://stackoverflow.com/questions/21904269/configure-gradle-to-publish-sources-and-javadoc
-java {
-    withSourcesJar()
-    withJavadocJar()
-}
-
 
 dependencies {
 
@@ -75,7 +73,7 @@ dependencies {
     api("org.jetbrains.kotlinx:kotlinx-serialization-core:1.3.2")
     api("org.jetbrains.kotlinx:kotlinx-cli:0.3.4")
 
-    api('com.charleskorn.kaml:kaml:0.49.0')
+    api('com.charleskorn.kaml:kaml:0.54.0')
 
     api("org.slf4j:slf4j-api:1.7.36")
     api('ch.qos.logback:logback-classic:1.2.11')
@@ -93,7 +91,7 @@ dependencies {
 }
 
 
-task uberjarDesktop(type: Jar) {
+tasks.register('uberjarDesktop', Jar) {
 
     from sourceSets.main.output
 
@@ -114,7 +112,7 @@ task uberjarDesktop(type: Jar) {
 }
 
 
-task uberjarServer(type: Jar) {
+tasks.register('uberjarServer', Jar) {
 
     from sourceSets.main.output
 
@@ -135,7 +133,7 @@ task uberjarServer(type: Jar) {
 }
 
 
-task uberjarSyspec(type: Jar) {
+tasks.register('uberjarSyspec', Jar) {
 
     from sourceSets.main.output
 
@@ -159,7 +157,7 @@ def projectRoot = rootProject.projectDir
 
 // copy jar to /usr/local/bin and make it executable
 // Remark: to be able to use it you must have jarwrapper installed (sudo apt install jarwrapper)
-task installlocally {
+tasks.register('installlocally') {
     dependsOn(uberjarServer, uberjarDesktop, uberjarSyspec)
     doLast {
         exec { commandLine("sh", "-c", "sudo apt-get update & sudo apt-get install jarwrapper") }
@@ -172,11 +170,6 @@ task installlocally {
     }
 }
 
-task sourceJar(type: Jar, dependsOn: classes) {
-    from sourceSets.main.allSource
-    archiveClassifier.set("sources")
-}
-
 
 // publish to repo.prod.meissa.de with task "publishLibraryPublicationToMeissaRepository" -- (using pattern "publishLibraryPublicationTo<MAVEN REPOSITORY NAME>Repository")
 publishing {