Updated game rules to match latest Paper API changes, upgraded dependencies, and configured Gradle for modern plugin development. Added run-paper for testing, updated Gradle wrapper, and included executable scripts for compatibility.

build.gradle

@@ -1,6 +1,7 @@
 plugins {
     id 'java'
-    id 'com.gradleup.shadow' version '8.3.1'
+    id 'com.gradleup.shadow' version '9.6.1'
+    id 'xyz.jpenilla.run-paper' version '3.0.2'
 }
 
 group = 'eu.mhsl.minecraft'
@@ -22,24 +23,18 @@ repositories {
 }
 
 dependencies {
-    compileOnly "io.papermc.paper:paper-api:1.21.10-R0.1-SNAPSHOT"
+    compileOnly "io.papermc.paper:paper-api:26.2.build.65-beta"
     implementation "co.aikar:taskchain-bukkit:3.7.2"
 }
 
-def targetJavaVersion = 21
 java {
-    def javaVersion = JavaVersion.toVersion(targetJavaVersion)
-    sourceCompatibility = javaVersion
-    targetCompatibility = javaVersion
-    if (JavaVersion.current() < javaVersion) {
-        toolchain.languageVersion = JavaLanguageVersion.of(targetJavaVersion)
-    }
+    toolchain.languageVersion = JavaLanguageVersion.of(25)
 }
 
 processResources {
     def props = [version: version]
     inputs.properties props
-    filteringCharset 'UTF-8'
+    filteringCharset = 'UTF-8'
     filesMatching('plugin.yml') {
         expand props
     }
@@ -56,5 +51,10 @@ shadowJar {
     relocate 'co.aikar.taskchain', 'eu.mhsl.minecraft.pixelblocks.taskchain'
 }
 
+runServer {
+    minecraftVersion '26.2'
+    systemProperty 'com.mojang.eula.agree', 'true'
+}
+
 jar.dependsOn shadowJar
 copyJarToTestServer.dependsOn jar