diff --git a/build.gradle b/build.gradle
index 0a6ada5..e620759 100644
--- a/build.gradle
+++ b/build.gradle
@@ -39,7 +39,7 @@ subprojects {
 		ext.maven_name='AtPlug test harness'
 		dependencies {
 			compileOnly "org.junit.jupiter:junit-jupiter-api:5.12.1"
-			implementation "org.jetbrains.kotlin:kotlin-reflect:2.1.0"
+			implementation "org.jetbrains.kotlin:kotlin-reflect:2.1.20"
 			implementation project(':atplug-runtime')
 		}
 	} else if (it.name == 'atplug-plugin-gradle') {
@@ -48,7 +48,7 @@ subprojects {
 		dependencies {
 			implementation "org.ow2.asm:asm:9.7.1"
 			implementation 'com.diffplug.gradle:goomph:4.2.0'
-			implementation 'org.jetbrains.kotlin:kotlin-gradle-plugin:2.1.0'
+			implementation 'org.jetbrains.kotlin:kotlin-gradle-plugin:2.1.20'
 			testImplementation 'org.assertj:assertj-core:3.27.3'
 		}
 		tasks.named('test') {
diff --git a/settings.gradle b/settings.gradle
index 8b5654b..bc6ba0d 100644
--- a/settings.gradle
+++ b/settings.gradle
@@ -20,11 +20,11 @@ plugins {
 	// https://plugins.gradle.org/plugin/org.jetbrains.dokka
 	id 'org.jetbrains.dokka'                       version '1.9.20' apply false
 	// https://plugins.gradle.org/plugin/org.jetbrains.kotlin.jvm
-	id 'org.jetbrains.kotlin.jvm'                  version '2.1.0' apply false
+	id 'org.jetbrains.kotlin.jvm'                  version '2.1.20' apply false
 	// https://plugins.gradle.org/plugin/org.jetbrains.kotlin.plugin.serialization
-	id 'org.jetbrains.kotlin.plugin.serialization' version '2.1.0' apply false
+	id 'org.jetbrains.kotlin.plugin.serialization' version '2.1.20' apply false
 	// https://plugins.gradle.org/plugin/org.jetbrains.kotlin.multiplatform
-	id 'org.jetbrains.kotlin.multiplatform' version '2.1.0' apply false
+	id 'org.jetbrains.kotlin.multiplatform' version '2.1.20' apply false
 	// https://github.com/adamko-dev/dokkatoo/releases
 	id 'dev.adamko.dokkatoo-html' version '2.4.0' apply false
 }