diff --git a/build.gradle b/build.gradle
index 1bff2db..8df40b5 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,11 +1,11 @@
 plugins {
-	id 'fabric-loom' version '1.6.+'
+	id 'fabric-loom' version '1.9-SNAPSHOT'
 	id 'maven-publish'
-	id 'org.jetbrains.kotlin.jvm' version "1.8.22"
+	id 'org.jetbrains.kotlin.jvm' version "2.0.0"
 }
 
-sourceCompatibility = JavaVersion.VERSION_17
-targetCompatibility = JavaVersion.VERSION_17
+sourceCompatibility = JavaVersion.VERSION_21
+targetCompatibility = JavaVersion.VERSION_21
 
 archivesBaseName = project.archives_base_name
 version = project.mod_version
@@ -28,9 +28,11 @@ dependencies {
 	modImplementation "net.fabricmc:fabric-loader:${project.loader_version}"
 
 	// Yes this has to be capitalised
-	modImplementation "com.github.quiltservertools:Ledger:1.3.0+local"
+	// To publish Ledger on mavenLocal, see this page:
+	// https://www.quiltservertools.net/Ledger/latest/api/extension_development/
+	modImplementation "com.github.quiltservertools:Ledger:1.3.7+local"
 
-	modImplementation "net.fabricmc:fabric-language-kotlin:1.9.4+kotlin.1.8.21"
+	modImplementation "net.fabricmc:fabric-language-kotlin:1.11.0+kotlin.2.0.0"
 
 	implementation(include("com.zaxxer:HikariCP:5.0.1"))
 
@@ -58,7 +60,15 @@ processResources {
 tasks.withType(JavaCompile).configureEach {
 	it.options.encoding = "UTF-8"
 
-	it.options.release = 17
+	it.options.release = 21
+}
+
+tasks.withType(org.jetbrains.kotlin.gradle.tasks.KotlinCompile).configureEach {
+	kotlinOptions.jvmTarget = "21"
+}
+
+kotlin {
+	jvmToolchain(21)
 }
 
 java {