diff --git a/build.gradle.kts b/build.gradle.kts
index aa14385..681b97d 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -23,6 +23,7 @@ dependencies {
     implementation(kotlin("reflect"))
     implementation("net.dv8tion:JDA:4.1.1_155")
     implementation("com.google.guava:guava:29.0-jre")
+    implementation("commons-codec:commons-codec:1.14")
     compileOnly(files("./libs/CorpseReborn.jar"))
     compileOnly(files("./libs/ActionBarAPI.jar"))
     compileOnly(files("./libs/ProtocolLib.jar"))
diff --git a/src/main/kotlin/de/moritzruth/spigot_ttt/Resourcepack.kt b/src/main/kotlin/de/moritzruth/spigot_ttt/Resourcepack.kt
index 5343d44..fdcd79c 100644
--- a/src/main/kotlin/de/moritzruth/spigot_ttt/Resourcepack.kt
+++ b/src/main/kotlin/de/moritzruth/spigot_ttt/Resourcepack.kt
@@ -1,9 +1,11 @@
 package de.moritzruth.spigot_ttt
 
+import org.apache.commons.codec.binary.Hex
 import org.bukkit.Material
 
 object Resourcepack {
     const val url = "https://github.com/moritzruth/spigot-ttt/raw/master/resourcepack.zip"
+    val checksum = Hex.decodeHex("9333ca9c1e5f6ade64575b6007ded85a94450753")
     private const val NAMESPACE = "ttt:"
 
     object Items {
diff --git a/src/main/kotlin/de/moritzruth/spigot_ttt/ResourcepackCommand.kt b/src/main/kotlin/de/moritzruth/spigot_ttt/ResourcepackCommand.kt
index 9ef8e9c..007047e 100644
--- a/src/main/kotlin/de/moritzruth/spigot_ttt/ResourcepackCommand.kt
+++ b/src/main/kotlin/de/moritzruth/spigot_ttt/ResourcepackCommand.kt
@@ -19,7 +19,7 @@ class ResourcepackCommand: CommandExecutor {
         if (sender !is Player) {
             sender.sendMessage("$COMMAND_RESPONSE_PREFIX${ChatColor.RED}Dieser Befehl kan nur als Spieler verwendet werden.")
         } else {
-            sender.setResourcePack(Resourcepack.url)
+            sender.setResourcePack(Resourcepack.url, Resourcepack.checksum)
         }
 
         return true
diff --git a/src/main/kotlin/de/moritzruth/spigot_ttt/TTTListener.kt b/src/main/kotlin/de/moritzruth/spigot_ttt/TTTListener.kt
index 20e139d..62dd3b4 100644
--- a/src/main/kotlin/de/moritzruth/spigot_ttt/TTTListener.kt
+++ b/src/main/kotlin/de/moritzruth/spigot_ttt/TTTListener.kt
@@ -37,8 +37,7 @@ object TTTListener: Listener {
         )
 
         event.joinMessage = "${TTTPlugin.prefix}${player.displayName} ${ChatColor.GOLD}hat das Spiel betreten."
-        player.setResourcePack(Resourcepack.url)
-        player.sendMessage("${TTTPlugin.prefix}${ChatColor.GREEN}Das Resourcepack wird heruntergeladen.")
+        player.setResourcePack(Resourcepack.url, Resourcepack.checksum)
     }
 
     @EventHandler
@@ -46,7 +45,8 @@ object TTTListener: Listener {
         when (event.status) {
             PlayerResourcePackStatusEvent.Status.DECLINED -> {
                 event.player.sendMessage("${TTTPlugin.prefix}${ChatColor.RED}Du hast das Resourcepack abgelehnt.")
-                event.player.sendMessage("${TTTPlugin.prefix}${ChatColor.GREEN}${ChatColor.BOLD}Wenn du es dir anders überlegt hast, tritt dem Server neu bei.")
+                event.player.sendMessage("${TTTPlugin.prefix}${ChatColor.GREEN}${ChatColor.BOLD}Wenn du es dir anders " +
+                        "überlegst, entferne den Server aus deiner Serverlist und tritt ihm erneut bei.")
             }
             PlayerResourcePackStatusEvent.Status.FAILED_DOWNLOAD -> {
                 event.player.sendMessage("${TTTPlugin.prefix}${ChatColor.RED}Das Laden des Resourcepacks " +