diff --git a/README.md b/README.md
index 7be146a..5c3aeac 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,7 @@ on [blog.novatec-gmbh.de](https://blog.novatec-gmbh.de).
 
 ## System Requirements
 
-* Java 9 SDK
+* Java 11 SDK
 
 ## Using this demo project
 
diff --git a/build.gradle.kts b/build.gradle.kts
index 6bc391a..0b9bf31 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -8,7 +8,7 @@ plugins {
 
 group = "com.example"
 version = "1.0.0-SNAPSHOT"
-java.sourceCompatibility = JavaVersion.VERSION_1_8
+java.sourceCompatibility = JavaVersion.VERSION_11
 
 val developmentOnly by configurations.creating
 configurations {