diff --git a/README.md b/README.md
index fb9fe206..1fbe537f 100644
--- a/README.md
+++ b/README.md
@@ -19,6 +19,9 @@ The [CupsClient](https://github.com/gmuth/ipp-client-kotlin/blob/master/src/main
 supports printer lookup by queue name.
 Repository [ipp-samples](https://github.com/gmuth/ipp-samples) contains examples how to use jmDNS.
 
+```
+implementation("de.gmuth:ipp-client:3.0")
+```
 ### [IppPrinter](https://github.com/gmuth/ipp-client-kotlin/blob/master/src/main/kotlin/de/gmuth/ipp/client/IppPrinter.kt) and [IppJob](https://github.com/gmuth/ipp-client-kotlin/blob/master/src/main/kotlin/de/gmuth/ipp/client/IppJob.kt)
 
 ```kotlin
@@ -139,7 +142,7 @@ if (defaultPrinter.hasCapability(Capability.CanPrintInColor)) {
 }
 
 // get canceled jobs and save documents
-cupsClient.getJobsAndSaveDocuments(IppWhichJobs.Canceled)
+cupsClient.getJobsAndSaveDocuments(WhichJobs.Canceled)
 
 ```
 
@@ -172,7 +175,7 @@ now implemented by StdoutHandler and SimpleClassNameFormatter.
 I moved all of my custom logging code to it's own
 repository [logging-kotlin](https://github.com/gmuth/logging-kotlin/tree/main/src/main/kotlin/de/gmuth/log).
 
-## Build
+## Build sources
 
 To build the jar make sure you have JDK 11 installed.
 The default tasks build the jar in `build/libs`.
@@ -183,29 +186,12 @@ To install the artifact to your local maven repository run
 
     ./gradlew publishToMavenLocal
 
-This software has **no dependencies** to
+The build produces the jar, sources and javadoc artifacts. This software has **no dependencies** to
 [javax.print](https://docs.oracle.com/javase/7/docs/technotes/guides/jps/),
 [CUPS](https://www.cups.org) or
 [ipptool](https://www.cups.org/doc/man-ipptool.html).
 Operation has mostly been tested for target `jvm`. Android is supported since v1.6.
 
-## Artifact coordinates
-
-The build produces the jar, sources and javadoc artifacts. They are available at
-[maven central repository](https://central.sonatype.com/namespace/de.gmuth).
-
-- group: gmuth.de
-- artifact: ipp-client
-- version: 3.0
-
-Add dependency:
-
-```
-    implementation("de.gmuth:ipp-client:3.0")
-```
-
-## Source packages
-
 Package
 [`de.gmuth.ipp.core`](https://github.com/gmuth/ipp-client-kotlin/tree/master/src/main/kotlin/de/gmuth/ipp/core)
 contains the usual
@@ -213,7 +199,6 @@ contains the usual
 and
 [decoding](https://github.com/gmuth/ipp-client-kotlin/blob/master/src/main/kotlin/de/gmuth/ipp/core/IppInputStream.kt)
 operations. RFC 8010 is fully supported.
-
 Package
 [`de.gmuth.ipp.client`](https://github.com/gmuth/ipp-client-kotlin/tree/master/src/main/kotlin/de/gmuth/ipp/client)
 contains the
@@ -222,9 +207,7 @@ and implementations of higher level IPP objects like
 [IppPrinter]((https://github.com/gmuth/ipp-client-kotlin/blob/master/src/main/kotlin/de/gmuth/ipp/client/IppPrinter.kt)),
 [IppJob]((https://github.com/gmuth/ipp-client-kotlin/blob/master/src/main/kotlin/de/gmuth/ipp/client/IppJob.kt)),
 [IppSubscription]((https://github.com/gmuth/ipp-client-kotlin/blob/master/src/main/kotlin/de/gmuth/ipp/client/IppSubscription.kt)) and
-[IppEventNotification]((https://github.com/gmuth/ipp-client-kotlin/blob/master/src/main/kotlin/de/gmuth/ipp/client/IppEventNotification.kt))
-
-## No Multiplatform support
+[IppEventNotification]((https://github.com/gmuth/ipp-client-kotlin/blob/master/src/main/kotlin/de/gmuth/ipp/client/IppEventNotification.kt)).
 
 IPP is based on the exchange of binary messages via HTTP.
 For reading and writing binary data
diff --git a/build.gradle.kts b/build.gradle.kts
index fa836f6d..f6016d89 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -14,7 +14,7 @@ plugins {
 }
 
 group = "de.gmuth"
-version = "3.0-SNAPSHOT"
+version = "3.0"
 
 repositories {
     mavenCentral()
@@ -43,17 +43,19 @@ defaultTasks("assemble")
 //    }
 //}
 
+val javaVersion = "1.8"
+
 tasks.compileKotlin {
     kotlinOptions {
         // If 1.6 is required you also have to configure gradle plugin org.jetbrains.kotlin.jvm version 1.6
-        jvmTarget = "1.8"
+        jvmTarget = javaVersion
     }
 }
 
 // avoid warnings "jvm target compatibility should be set to the same Java version."
 tasks.compileTestKotlin {
     kotlinOptions {
-        jvmTarget = "1.8"
+        jvmTarget = javaVersion
     }
 }
 
@@ -62,6 +64,11 @@ tasks.compileJava {
     targetCompatibility = tasks.compileKotlin.get().kotlinOptions.jvmTarget
 }
 
+tasks.compileTestJava {
+    sourceCompatibility = tasks.compileTestKotlin.get().kotlinOptions.jvmTarget
+    targetCompatibility = tasks.compileTestKotlin.get().kotlinOptions.jvmTarget
+}
+
 //tasks.withType<Jar> {
 //    archiveBaseName.set("ipp-client")
 //    archiveClassifier.set("")