diff --git a/src/Server.php b/src/Server.php
index 33197af82..02c3da597 100644
--- a/src/Server.php
+++ b/src/Server.php
@@ -147,7 +147,6 @@ use const DIRECTORY_SEPARATOR;
 use const PHP_EOL;
 use const PHP_INT_MAX;
 use const PTHREADS_INHERIT_NONE;
-use const ZLIB_ENCODING_DEFLATE;
 use const ZLIB_ENCODING_GZIP;
 
 /**
diff --git a/src/network/mcpe/handler/LoginPacketHandler.php b/src/network/mcpe/handler/LoginPacketHandler.php
index 870bbc4d8..b9b072fa7 100644
--- a/src/network/mcpe/handler/LoginPacketHandler.php
+++ b/src/network/mcpe/handler/LoginPacketHandler.php
@@ -37,21 +37,12 @@ use pocketmine\network\mcpe\protocol\PlayStatusPacket;
 use pocketmine\network\mcpe\protocol\ProtocolInfo;
 use pocketmine\network\mcpe\protocol\types\login\AuthenticationData;
 use pocketmine\network\mcpe\protocol\types\login\ClientData;
-use pocketmine\network\mcpe\protocol\types\login\ClientDataPersonaPieceTintColor;
-use pocketmine\network\mcpe\protocol\types\login\ClientDataPersonaSkinPiece;
 use pocketmine\network\mcpe\protocol\types\login\ClientDataToSkinDataHelper;
 use pocketmine\network\mcpe\protocol\types\login\JwtChain;
-use pocketmine\network\mcpe\protocol\types\PersonaPieceTintColor;
-use pocketmine\network\mcpe\protocol\types\PersonaSkinPiece;
-use pocketmine\network\mcpe\protocol\types\SkinAnimation;
-use pocketmine\network\mcpe\protocol\types\SkinData;
-use pocketmine\network\mcpe\protocol\types\SkinImage;
 use pocketmine\player\Player;
 use pocketmine\player\PlayerInfo;
 use pocketmine\Server;
 use pocketmine\uuid\UUID;
-use function array_map;
-use function base64_decode;
 use function is_array;
 
 /**
diff --git a/src/network/mcpe/protocol/serializer/PacketSerializer.php b/src/network/mcpe/protocol/serializer/PacketSerializer.php
index c6f0c3bce..5c40a4904 100644
--- a/src/network/mcpe/protocol/serializer/PacketSerializer.php
+++ b/src/network/mcpe/protocol/serializer/PacketSerializer.php
@@ -43,9 +43,9 @@ use pocketmine\network\mcpe\protocol\types\entity\MetadataProperty;
 use pocketmine\network\mcpe\protocol\types\entity\ShortMetadataProperty;
 use pocketmine\network\mcpe\protocol\types\entity\StringMetadataProperty;
 use pocketmine\network\mcpe\protocol\types\entity\Vec3MetadataProperty;
+use pocketmine\network\mcpe\protocol\types\FixedItemIds;
 use pocketmine\network\mcpe\protocol\types\GameRuleType;
 use pocketmine\network\mcpe\protocol\types\inventory\ItemStack;
-use pocketmine\network\mcpe\protocol\types\FixedItemIds;
 use pocketmine\network\mcpe\protocol\types\PersonaPieceTintColor;
 use pocketmine\network\mcpe\protocol\types\PersonaSkinPiece;
 use pocketmine\network\mcpe\protocol\types\recipe\RecipeIngredient;