diff --git a/buildSrc/build.gradle.kts b/buildSrc/build.gradle.kts
index 5fa62447..ff1e63fb 100644
--- a/buildSrc/build.gradle.kts
+++ b/buildSrc/build.gradle.kts
@@ -8,6 +8,8 @@ repositories {
 
 dependencies {
     implementation("org.graalvm.buildtools.native:org.graalvm.buildtools.native.gradle.plugin:0.9.25")
-    implementation("io.micronaut.gradle:micronaut-gradle-plugin:4.0.3")
-    implementation("io.micronaut.gradle:micronaut-test-resources-plugin:4.0.0-M8")
+    implementation (libs.gradle.kotlin)
+    implementation (libs.gradle.kotlin.allopen)
+    implementation (libs.gradle.kotlin.noarg)
+    implementation (libs.micronaut.gradle.plugin)
 }
diff --git a/buildSrc/settings.gradle b/buildSrc/settings.gradle
new file mode 100644
index 00000000..6f31e6ef
--- /dev/null
+++ b/buildSrc/settings.gradle
@@ -0,0 +1,7 @@
+dependencyResolutionManagement {
+    versionCatalogs {
+        libs {
+            from(files("../gradle/libs.versions.toml"))
+        }
+    }
+}
diff --git a/gradle.properties b/gradle.properties
index 63958621..2c72c576 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -14,3 +14,16 @@ apimqttv3=https://www.eclipse.org/paho/files/javadoc/
 
 org.gradle.caching=true
 org.gradle.jvmargs=-Xmx1g
+
+# No matter which Java toolchain we use, the Kotlin Daemon is always invoked by the current JDK.
+# Therefor to fix Kapt errors when running tests under Java 21, we need to open up some modules for the Kotlin Daemon.
+kotlin.daemon.jvmargs=--add-opens=jdk.compiler/com.sun.tools.javac.api=ALL-UNNAMED\
+ --add-opens=jdk.compiler/com.sun.tools.javac.code=ALL-UNNAMED \
+ --add-opens=jdk.compiler/com.sun.tools.javac.comp=ALL-UNNAMED \
+ --add-opens=jdk.compiler/com.sun.tools.javac.file=ALL-UNNAMED \
+ --add-opens=jdk.compiler/com.sun.tools.javac.jvm=ALL-UNNAMED \
+ --add-opens=jdk.compiler/com.sun.tools.javac.main=ALL-UNNAMED \
+ --add-opens=jdk.compiler/com.sun.tools.javac.parser=ALL-UNNAMED \
+ --add-opens=jdk.compiler/com.sun.tools.javac.processing=ALL-UNNAMED \
+ --add-opens=jdk.compiler/com.sun.tools.javac.tree=ALL-UNNAMED \
+ --add-opens=jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index 7ca0020a..b0d5deba 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -1,8 +1,9 @@
 [versions]
 micronaut-docs = "2.0.0"
-micronaut = "4.0.0"
+micronaut = "4.1.10"
+micronaut-gradle-plugin = "4.1.1"
 
-groovy = "4.0.13"
+groovy = "4.0.15"
 spock = "2.3-groovy-4.0"
 
 managed-mqttv3 = "1.2.5"
@@ -11,27 +12,26 @@ managed-hivemq-client = "1.3.1"
 
 awaitility = "4.2.0"
 bcpkix-jdk15on = "1.70"
-kotlin = "1.8.22"
-testcontainers = "1.18.3"
+kotlin = "1.9.10"
+testcontainers = "1.19.1"
 
 micronaut-reactor = "3.0.0"
 micronaut-serde = "2.0.0"
 micronaut-test = "4.0.0"
 micronaut-validation = "4.0.0"
-micronaut-logging = "1.0.0"
+micronaut-logging = "1.1.2"
 
 [libraries]
 # Core
 micronaut-core = { module = 'io.micronaut:micronaut-core-bom', version.ref = 'micronaut' }
-
 micronaut-reactor = { module = "io.micronaut.reactor:micronaut-reactor-bom", version.ref = "micronaut-reactor" }
+micronaut-serde = { module = "io.micronaut.serde:micronaut-serde-bom", version.ref = "micronaut-serde" }
+micronaut-validation = { module = "io.micronaut.validation:micronaut-validation-bom", version.ref = "micronaut-validation" }
+
 managed-paho-mqttv3-client = { module = "org.eclipse.paho:org.eclipse.paho.client.mqttv3", version.ref = "managed-mqttv3" }
 managed-paho-mqttv5-client = { module = "org.eclipse.paho:org.eclipse.paho.mqttv5.client", version.ref = "managed-mqttv5" }
 managed-hivemq-client = { module = "com.hivemq:hivemq-mqtt-client", version.ref = "managed-hivemq-client" }
 
-micronaut-serde = { module = "io.micronaut.serde:micronaut-serde-bom", version.ref = "micronaut-serde" }
-micronaut-validation = { module = "io.micronaut.validation:micronaut-validation-bom", version.ref = "micronaut-validation" }
-
 awaitility = { module = "org.awaitility:awaitility", version.ref = "awaitility" }
 bcpkix-jdk15on = { module = "org.bouncycastle:bcpkix-jdk15on", version.ref = "bcpkix-jdk15on" }
 junit-jupiter-api = { module = "org.junit.jupiter:junit-jupiter-api" }
@@ -39,6 +39,9 @@ junit-jupiter-engine = { module = "org.junit.jupiter:junit-jupiter-engine" }
 kotlin-stdlib-jdk8 = { module = "org.jetbrains.kotlin:kotlin-stdlib-jdk8", version.ref = "kotlin" }
 testcontainers-spock = { module = "org.testcontainers:spock", version.ref = "testcontainers" }
 
-[plugins]
-kotlin-jvm = { id = 'org.jetbrains.kotlin.jvm', version.ref = 'kotlin' }
-kotlin-kapt = { id = 'org.jetbrains.kotlin.kapt', version.ref = 'kotlin' }
+gradle-kotlin = { module = "org.jetbrains.kotlin:kotlin-gradle-plugin", version.ref = "kotlin" }
+gradle-kotlin-allopen = { module = "org.jetbrains.kotlin:kotlin-allopen", version.ref = "kotlin" }
+gradle-kotlin-noarg = { module = "org.jetbrains.kotlin:kotlin-noarg", version.ref = "kotlin" }
+
+micronaut-gradle-plugin = { module = "io.micronaut.gradle:micronaut-gradle-plugin", version.ref="micronaut-gradle-plugin" }
+
diff --git a/settings.gradle b/settings.gradle
index d2dac439..bfdb5d1b 100644
--- a/settings.gradle
+++ b/settings.gradle
@@ -6,7 +6,7 @@ pluginManagement {
 }
 
 plugins {
-    id("io.micronaut.build.shared.settings") version "6.5.3"
+    id("io.micronaut.build.shared.settings") version "6.6.0"
 }
 
 enableFeaturePreview("TYPESAFE_PROJECT_ACCESSORS")
diff --git a/test-suite-kotlin/build.gradle b/test-suite-kotlin/build.gradle
index c0c52581..8d15eb61 100644
--- a/test-suite-kotlin/build.gradle
+++ b/test-suite-kotlin/build.gradle
@@ -1,6 +1,6 @@
 plugins {
-    alias libs.plugins.kotlin.jvm
-    alias libs.plugins.kotlin.kapt
+    id "org.jetbrains.kotlin.jvm"
+    id("org.jetbrains.kotlin.kapt")
     id("io.micronaut.build.internal.mqtt-tests")
 }
 
@@ -20,3 +20,9 @@ dependencies {
 tasks.named('test') {
     useJUnitPlatform()
 }
+
+kotlin {
+    jvmToolchain {
+        languageVersion.set(JavaLanguageVersion.of(17))
+    }
+}
diff --git a/test-suite-utils/build.gradle b/test-suite-utils/build.gradle
index 6137dca7..47e99d31 100644
--- a/test-suite-utils/build.gradle
+++ b/test-suite-utils/build.gradle
@@ -2,6 +2,7 @@ plugins {
     id 'java-library'
     id 'groovy'
     id("io.micronaut.build.internal.mqtt-tests")
+    id("io.micronaut.build.internal.common")
 }
 
 dependencies {
@@ -12,3 +13,13 @@ dependencies {
     api(libs.testcontainers.spock)
     api(mnReactor.micronaut.reactor)
 }
+
+spotless {
+    groovy {
+        targetExclude("**/test/**")
+    }
+}
+
+tasks.withType(Checkstyle) {
+    enabled = false
+}