diff --git a/build.gradle b/build.gradle
index 6ac642eba..61ec6910e 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,5 +1,5 @@
 buildscript {
-    ext.kotlin_version = '1.9.10'
+    ext.kotlin_version = '1.9.20'
     repositories {
         maven {
             url "https://plugins.gradle.org/m2/"
diff --git a/bundles/sirix-kotlin-api/build.gradle b/bundles/sirix-kotlin-api/build.gradle
index 1fe5602de..4e9957790 100644
--- a/bundles/sirix-kotlin-api/build.gradle
+++ b/bundles/sirix-kotlin-api/build.gradle
@@ -6,7 +6,7 @@ buildscript {
     }
 
     dependencies {
-        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.9.10"
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.9.20"
     }
 }
 
diff --git a/bundles/sirix-rest-api/build.gradle b/bundles/sirix-rest-api/build.gradle
index fe3745dde..e10e634e0 100644
--- a/bundles/sirix-rest-api/build.gradle
+++ b/bundles/sirix-rest-api/build.gradle
@@ -4,7 +4,7 @@ buildscript {
     }
 
     dependencies {
-        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.9.10"
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.9.20"
         classpath "com.avast.gradle:gradle-docker-compose-plugin:0.14.5"
         //classpath "org.jetbrains.dokka:dokka-gradle-plugin:0.10.0"
     }