diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index f63d5fb..70d00ae 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -1,5 +1,5 @@
 [versions]
-kotlin = "1.9.20"
+kotlin = "1.9.21"
 kotlinx-serialization = "1.6.0"
 maven-artifact = "3.5.0"
 jupiter = "5.10.0"
diff --git a/src/test/kotlin/io/cloudflight/gradle/autoconfigure/kotlin/KotlinConfigurePluginTest.kt b/src/test/kotlin/io/cloudflight/gradle/autoconfigure/kotlin/KotlinConfigurePluginTest.kt
index bc32468..1759b24 100644
--- a/src/test/kotlin/io/cloudflight/gradle/autoconfigure/kotlin/KotlinConfigurePluginTest.kt
+++ b/src/test/kotlin/io/cloudflight/gradle/autoconfigure/kotlin/KotlinConfigurePluginTest.kt
@@ -75,7 +75,7 @@ class KotlinConfigurePluginTest {
         @JvmStatic
         fun singleKotlinModuleArguments(): Stream<Arguments> {
             // keep in sync with the kotlin version in libs.versions.toml
-            val currentKotlinVersion = "1.9.20"
+            val currentKotlinVersion = "1.9.21"
             return Stream.of(
                 arguments(
                     TestOptions(