diff --git a/README.md b/README.md
index fcd32a1..d4ad70b 100644
--- a/README.md
+++ b/README.md
@@ -12,7 +12,7 @@ kotlin-openapi3-dsl is available on maven central
 ### gradle
 
 ```groovy
-compile "cc.vileda:kotlin-openapi3-dsl:1.3.1"
+compile "cc.vileda:kotlin-openapi3-dsl:1.4.0"
 ```
 
 ### maven
@@ -20,7 +20,7 @@ compile "cc.vileda:kotlin-openapi3-dsl:1.3.1"
 <dependency>
     <groupId>cc.vileda</groupId>
     <artifactId>kotlin-openapi3-dsl</artifactId>
-    <version>1.3.1</version>
+    <version>1.4.0</version>
 </dependency>
 ```
 
diff --git a/build.gradle b/build.gradle
index c779da9..0df5335 100644
--- a/build.gradle
+++ b/build.gradle
@@ -16,7 +16,7 @@ apply plugin: 'maven-publish'
 apply plugin: 'signing'
 
 group 'cc.vileda'
-version '1.3.1'
+version '1.4.0'
 
 repositories {
     mavenCentral()
@@ -100,7 +100,7 @@ test {
 }
 
 dependencies {
-    implementation 'org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.9.22'
+    implementation 'org.jetbrains.kotlin:kotlin-stdlib:1.9.22'
     implementation group: 'com.fasterxml.jackson.core', name: 'jackson-core', version: "2.16.1"
     implementation group: 'com.fasterxml.jackson.core', name: 'jackson-databind', version: "2.16.1"
     implementation 'com.fasterxml.jackson.module:jackson-module-jsonSchema:2.16.1'
@@ -113,16 +113,16 @@ dependencies {
 }
 
 compileKotlin {
-    kotlinOptions.jvmTarget = "1.8"
+    kotlinOptions.jvmTarget = "17"
 }
 compileTestKotlin {
-    kotlinOptions.jvmTarget = "1.8"
+    kotlinOptions.jvmTarget = "17"
 }
 compileJava {
-    sourceCompatibility = 1.8
-    targetCompatibility = 1.8
+    sourceCompatibility = 17
+    targetCompatibility = 17
 }
 compileTestJava {
-    sourceCompatibility = 1.8
-    targetCompatibility = 1.8
+    sourceCompatibility = 17
+    targetCompatibility = 17
 }
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