diff --git a/src/pocketmine/PocketMine.php b/src/pocketmine/PocketMine.php
index fd80f55c1..dbb1007c6 100644
--- a/src/pocketmine/PocketMine.php
+++ b/src/pocketmine/PocketMine.php
@@ -144,6 +144,12 @@ namespace pocketmine {
 		exit(1);
 	}
 
+	if(version_compare(RakLib::VERSION, "0.8.1") < 0){
+		echo "[CRITICAL] RakLib version 0.8.1 is required, while you have version " . RakLib::VERSION . "." . PHP_EOL;
+		echo "[CRITICAL] Please update your submodules or use provided builds." . PHP_EOL;
+		exit(1);
+	}
+
 	set_time_limit(0); //Who set it to 30 seconds?!?!
 
 	ini_set("allow_url_fopen", '1');
diff --git a/src/pocketmine/utils/UUID.php b/src/pocketmine/utils/UUID.php
index 56c8767db..d95d60bcb 100644
--- a/src/pocketmine/utils/UUID.php
+++ b/src/pocketmine/utils/UUID.php
@@ -94,9 +94,6 @@ class UUID{
 		$hex = bin2hex($this->toBinary());
 
 		//xxxxxxxx-xxxx-Mxxx-Nxxx-xxxxxxxxxxxx 8-4-4-4-12
-		if($this->version !== null){
-			return substr($hex, 0, 8) . "-" . substr($hex, 8, 4) . "-" . hexdec($this->version) . substr($hex, 13, 3) . "-8" . substr($hex, 17, 3) . "-" . substr($hex, 20, 12);
-		}
 		return substr($hex, 0, 8) . "-" . substr($hex, 8, 4) . "-" . substr($hex, 12, 4) . "-" . substr($hex, 16, 4) . "-" . substr($hex, 20, 12);
 	}
 
diff --git a/src/raklib b/src/raklib
index 3b1ca9c1b..1fee79e4a 160000
--- a/src/raklib
+++ b/src/raklib
@@ -1 +1 @@
-Subproject commit 3b1ca9c1bedf1a18ef40757665bf8c9e7e769c9c
+Subproject commit 1fee79e4aac0f958ab720606e223b0aa690f5c47