diff --git a/docs/src/main/asciidoc/kotlin.adoc b/docs/src/main/asciidoc/kotlin.adoc
index 767e610cf8af8..65b0a83a26ff5 100644
--- a/docs/src/main/asciidoc/kotlin.adoc
+++ b/docs/src/main/asciidoc/kotlin.adoc
@@ -221,8 +221,8 @@ group = '...' // set your group
 version = '1.0.0-SNAPSHOT'
 
 java {
-    sourceCompatibility = JavaVersion.VERSION_11
-    targetCompatibility = JavaVersion.VERSION_11
+    sourceCompatibility = JavaVersion.VERSION_21
+    targetCompatibility = JavaVersion.VERSION_21
 }
 
 allOpen { // <2>
@@ -233,12 +233,12 @@ allOpen { // <2>
 }
 
 compileKotlin {
-    kotlinOptions.jvmTarget = JavaVersion.VERSION_11
+    kotlinOptions.jvmTarget = JavaVersion.VERSION_21
     kotlinOptions.javaParameters = true
 }
 
 compileTestKotlin {
-    kotlinOptions.jvmTarget = JavaVersion.VERSION_11
+    kotlinOptions.jvmTarget = JavaVersion.VERSION_21
 }
 ----
 
@@ -290,8 +290,8 @@ group = '...' // set your group
 version = "1.0.0-SNAPSHOT"
 
 java {
-    sourceCompatibility = JavaVersion.VERSION_11
-    targetCompatibility = JavaVersion.VERSION_11
+    sourceCompatibility = JavaVersion.VERSION_21
+    targetCompatibility = JavaVersion.VERSION_21
 }
 
 allOpen { // <2>