diff --git a/plugin.yml b/plugin.yml
index 3b1b1c5..efaa33c 100644
--- a/plugin.yml
+++ b/plugin.yml
@@ -1,6 +1,6 @@
 name: KDR
 version: 1.0.0
-api: [3.0.0]
+api: [4.0.0]
 main: JackMD\KDR\KDR
 author: JackMD
 description: KDR, Kill Death Ratio plugin which keeps track of players kill and death count along with kill to death ratio.
diff --git a/src/JackMD/KDR/EventListener.php b/src/JackMD/KDR/EventListener.php
index f131dcf..20baab2 100644
--- a/src/JackMD/KDR/EventListener.php
+++ b/src/JackMD/KDR/EventListener.php
@@ -37,7 +37,7 @@
 use pocketmine\event\Listener;
 use pocketmine\event\player\PlayerDeathEvent;
 use pocketmine\event\player\PlayerJoinEvent;
-use pocketmine\Player;
+use pocketmine\player\Player;
 
 class EventListener implements Listener{
 
diff --git a/src/JackMD/KDR/KDR.php b/src/JackMD/KDR/KDR.php
index 62e269c..f83610e 100644
--- a/src/JackMD/KDR/KDR.php
+++ b/src/JackMD/KDR/KDR.php
@@ -62,7 +62,7 @@ public function onEnable(): void{
 		$this->setProvider();
 		$this->getProvider()->prepare();
 		$this->getServer()->getPluginManager()->registerEvents(new EventListener($this), $this);
-		$this->getLogger()->info("KillCounter Plugin Enabled.");
+		$this->getLogger()->info("KillCounter Plugin Enabled by JackMD.");
 	}
 	
 	/**
diff --git a/src/JackMD/KDR/provider/ProviderInterface.php b/src/JackMD/KDR/provider/ProviderInterface.php
index ffa9e72..97a06d3 100644
--- a/src/JackMD/KDR/provider/ProviderInterface.php
+++ b/src/JackMD/KDR/provider/ProviderInterface.php
@@ -33,7 +33,7 @@
 
 namespace JackMD\KDR\provider;
 
-use pocketmine\Player;
+use pocketmine\player\Player;
 
 interface ProviderInterface{
 	
@@ -100,4 +100,3 @@ public function getKillToDeathRatio(Player $player): string;
 	 */
 	public function close(): void;
 }
-
diff --git a/src/JackMD/KDR/provider/SQLiteProvider.php b/src/JackMD/KDR/provider/SQLiteProvider.php
index f7622b0..49fcd6d 100644
--- a/src/JackMD/KDR/provider/SQLiteProvider.php
+++ b/src/JackMD/KDR/provider/SQLiteProvider.php
@@ -34,7 +34,7 @@
 namespace JackMD\KDR\provider;
 
 use JackMD\KDR\KDR;
-use pocketmine\Player;
+use pocketmine\player\Player;
 
 class SQLiteProvider implements ProviderInterface{
 	
@@ -134,4 +134,3 @@ public function close(): void{
 		$this->killCounterDB->close();
 	}
 }
-
diff --git a/src/JackMD/KDR/provider/YamlProvider.php b/src/JackMD/KDR/provider/YamlProvider.php
index a48d95b..ab8976f 100644
--- a/src/JackMD/KDR/provider/YamlProvider.php
+++ b/src/JackMD/KDR/provider/YamlProvider.php
@@ -34,7 +34,7 @@
 namespace JackMD\KDR\provider;
 
 use JackMD\KDR\KDR;
-use pocketmine\Player;
+use pocketmine\player\Player;
 use pocketmine\utils\Config;
 
 class YamlProvider implements ProviderInterface{
@@ -49,7 +49,7 @@ public function prepare(): void{
 	 * @param Player $player
 	 */
 	public function registerPlayer(Player $player): void{
-		$config = new Config(KDR::getInstance()->getDataFolder() . "data/" . $player->getLowerCaseName() . ".yml", Config::YAML);
+		$config = new Config(KDR::getInstance()->getDataFolder() . "data/" . $player->getDisplayName() . ".yml", Config::YAML);
 		if((!$config->exists("kills")) && (!$config->exists("deaths"))){
 			$config->setAll(["kills" => 0, "deaths" => 0]);
 			$config->save();
@@ -61,7 +61,7 @@ public function registerPlayer(Player $player): void{
 	 * @param int    $points
 	 */
 	public function addDeathPoints(Player $player, int $points = 1): void{
-		$config = new Config(KDR::getInstance()->getDataFolder() . "data/" . $player->getLowerCaseName() . ".yml", Config::YAML);
+		$config = new Config(KDR::getInstance()->getDataFolder() . "data/" . $player->getDisplayName() . ".yml", Config::YAML);
 		$config->set("deaths", $this->getPlayerDeathPoints($player) + $points);
 		$config->save();
 	}
@@ -71,7 +71,7 @@ public function addDeathPoints(Player $player, int $points = 1): void{
 	 * @return int
 	 */
 	public function getPlayerDeathPoints(Player $player): int{
-		$config = new Config(KDR::getInstance()->getDataFolder() . "data/" . $player->getLowerCaseName() . ".yml", Config::YAML);
+		$config = new Config(KDR::getInstance()->getDataFolder() . "data/" . $player->getDisplayName() . ".yml", Config::YAML);
 		return (int) $config->get("deaths");
 	}
 	
@@ -80,7 +80,7 @@ public function getPlayerDeathPoints(Player $player): int{
 	 * @param int    $points
 	 */
 	public function addKillPoints(Player $player, int $points = 1): void{
-		$config = new Config(KDR::getInstance()->getDataFolder() . "data/" . $player->getLowerCaseName() . ".yml", Config::YAML);
+		$config = new Config(KDR::getInstance()->getDataFolder() . "data/" . $player->getDisplayName() . ".yml", Config::YAML);
 		$config->set("kills", $this->getPlayerKillPoints($player) + $points);
 		$config->save();
 	}
@@ -90,7 +90,7 @@ public function addKillPoints(Player $player, int $points = 1): void{
 	 * @return bool
 	 */
 	public function playerExists(Player $player): bool{
-		$config = new Config(KDR::getInstance()->getDataFolder() . "data/" . $player->getLowerCaseName() . ".yml", Config::YAML);
+		$config = new Config(KDR::getInstance()->getDataFolder() . "data/" . $player->getDisplayName() . ".yml", Config::YAML);
 		return (($config->exists("kills")) && ($config->exists("deaths"))) ? true : false;
 	}
 	
@@ -115,7 +115,7 @@ public function getKillToDeathRatio(Player $player): string{
 	 * @return int
 	 */
 	public function getPlayerKillPoints(Player $player): int{
-		$config = new Config(KDR::getInstance()->getDataFolder() . "data/" . $player->getLowerCaseName() . ".yml", Config::YAML);
+		$config = new Config(KDR::getInstance()->getDataFolder() . "data/" . $player->getDisplayName() . ".yml", Config::YAML);
 		return (int) $config->get("kills");
 	}
 	
@@ -123,4 +123,3 @@ public function close(): void{
 		//useless in this case...
 	}
 }
-