diff --git a/build.gradle.kts b/build.gradle.kts
index 21e3af6..a623cc1 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -1,5 +1,5 @@
 plugins {
-    id("org.jetbrains.kotlin.js") version "1.8.20"
+    id("org.jetbrains.kotlin.js") version "1.9.0"
 }
 
 group = "fr.username404"
@@ -14,7 +14,7 @@ dependencies {
     implementation("org.jetbrains.kotlinx:kotlinx-html:${rootProject.property("kotlinx-html_version")}")
 }
 
-val outputDirectory = file("$rootDir/compiledOutput")
+val compilationOutputDirectory = file("$rootDir/compiledOutput")
 
 kotlin {
     js(IR) {
@@ -25,7 +25,13 @@ kotlin {
                 apiVersion = coreLibrariesVersion.run {
                     substring(0 until secondDot)
                 }
-                languageVersion = apiVersion!!.substringBefore('.') + '.' + (apiVersion!!.substringAfter('.').toInt() + 1).toString()
+                val majorVersion = apiVersion!!.substringBefore('.').toInt()
+                val minorVersion = apiVersion!!.substringAfter('.').toInt()
+                languageVersion = if (minorVersion == 9) {
+                    "${majorVersion + 1}.0"
+                } else {
+                    "$majorVersion.${minorVersion + 1}"
+                }
 
                 moduleKind = "plain"
                 freeCompilerArgs = freeCompilerArgs + listOf(
@@ -36,31 +42,31 @@ kotlin {
             }
         }
         browser {
-            webpackTask {
-                destinationDirectory = outputDirectory
+            webpackTask(Action {
+                outputDirectory = compilationOutputDirectory
                 output.library = "Web404"
                 output.libraryTarget = "this"
                 cssSupport { isEnabled = true }
-            }
-
-            runTask {
+            })
+            
+            runTask(Action {
                 cssSupport { isEnabled = true }
-            }
+            })
 
-            testTask {
+            testTask(Action {
                 useKarma {
                     useFirefoxNightlyHeadless()
                     webpackConfig.cssSupport { isEnabled = true }
                 }
-            }
+            })
         }
         binaries.executable()
     }
 }
 
 tasks {
-    clean.get().delete.add(outputDirectory)
+    clean.get().delete.add(compilationOutputDirectory)
     withType(ProcessResources::class) {
-        destinationDir = outputDirectory
+        destinationDir = compilationOutputDirectory
     }
 }
diff --git a/gradle.properties b/gradle.properties
index 6a72ca8..e7f7f04 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -6,5 +6,6 @@ org.gradle.caching=true
 org.gradle.parallel=true
 org.gradle.unsafe.configuration-cache=on
 org.gradle.vfs.watch=true
+kotlin.experimental.tryK2=true
 
-kotlinx-html_version=0.8.0+
+kotlinx-html_version=0.9.1+
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index e6f16f6..70f299e 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.1-rc-3-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.3-rc-3-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists