diff --git a/src/main/java/ru/nanit/limbo/connection/pipeline/PacketEncoder.java b/src/main/java/ru/nanit/limbo/connection/pipeline/PacketEncoder.java
index 119222d..95b4b43 100644
--- a/src/main/java/ru/nanit/limbo/connection/pipeline/PacketEncoder.java
+++ b/src/main/java/ru/nanit/limbo/connection/pipeline/PacketEncoder.java
@@ -42,7 +42,10 @@ public class PacketEncoder extends MessageToByteEncoder<Packet> {
 
         try {
             packet.encode(msg, version);
-            Logger.debug("Sending %s packet", packet.toString());
+
+            if (Logger.getLevel() >= 3) {
+                Logger.debug("Sending %s packet (%d bytes)", packet.toString(), msg.readableBytes());
+            }
         } catch (Exception e) {
             Logger.warning("Cannot encode packet 0x%s: %s", Integer.toHexString(packetId), e.getMessage());
         }
diff --git a/src/main/java/ru/nanit/limbo/protocol/packets/login/PacketLoginSuccess.java b/src/main/java/ru/nanit/limbo/protocol/packets/login/PacketLoginSuccess.java
index 3281e40..9acd9a4 100644
--- a/src/main/java/ru/nanit/limbo/protocol/packets/login/PacketLoginSuccess.java
+++ b/src/main/java/ru/nanit/limbo/protocol/packets/login/PacketLoginSuccess.java
@@ -21,7 +21,11 @@ public class PacketLoginSuccess implements PacketOut {
 
     @Override
     public void encode(ByteMessage msg, Version version) {
-        msg.writeUuid(uuid);
+        if (version.moreOrEqual(Version.V1_16)) {
+            msg.writeUuid(uuid);
+        } else {
+            msg.writeString(uuid.toString());
+        }
         msg.writeString(username);
     }
 
diff --git a/src/main/java/ru/nanit/limbo/protocol/packets/play/PacketJoinGame.java b/src/main/java/ru/nanit/limbo/protocol/packets/play/PacketJoinGame.java
index 0aa8ffa..65c15c5 100644
--- a/src/main/java/ru/nanit/limbo/protocol/packets/play/PacketJoinGame.java
+++ b/src/main/java/ru/nanit/limbo/protocol/packets/play/PacketJoinGame.java
@@ -90,7 +90,7 @@ public class PacketJoinGame implements PacketOut {
 
         if (version.fromTo(Version.V1_8, Version.V1_13_2)) {
             msg.writeByte(gameMode);
-            msg.writeByte(dimension.getId());
+            msg.writeInt(dimension.getId());
             msg.writeByte(0); // Difficulty
             msg.writeByte(maxPlayers);
             msg.writeString("flat"); // Level type
@@ -99,7 +99,7 @@ public class PacketJoinGame implements PacketOut {
 
         if (version.fromTo(Version.V1_14, Version.V1_14_4)) {
             msg.writeByte(gameMode);
-            msg.writeByte(dimension.getId());
+            msg.writeInt(dimension.getId());
             msg.writeByte(maxPlayers);
             msg.writeString("flat"); // Level type
             msg.writeVarInt(viewDistance);
@@ -108,7 +108,7 @@ public class PacketJoinGame implements PacketOut {
 
         if (version.fromTo(Version.V1_15, Version.V1_15_2)) {
             msg.writeByte(gameMode);
-            msg.writeByte(dimension.getId());
+            msg.writeInt(dimension.getId());
             msg.writeLong(hashedSeed);
             msg.writeByte(maxPlayers);
             msg.writeString("flat"); // Level type
diff --git a/src/main/java/ru/nanit/limbo/protocol/packets/play/PacketKeepAlive.java b/src/main/java/ru/nanit/limbo/protocol/packets/play/PacketKeepAlive.java
index 5efa640..5c5b79a 100644
--- a/src/main/java/ru/nanit/limbo/protocol/packets/play/PacketKeepAlive.java
+++ b/src/main/java/ru/nanit/limbo/protocol/packets/play/PacketKeepAlive.java
@@ -34,4 +34,8 @@ public class PacketKeepAlive implements Packet {
         }
     }
 
+    @Override
+    public String toString() {
+        return getClass().getSimpleName();
+    }
 }
diff --git a/src/main/java/ru/nanit/limbo/util/Logger.java b/src/main/java/ru/nanit/limbo/util/Logger.java
index 15312b9..c327851 100644
--- a/src/main/java/ru/nanit/limbo/util/Logger.java
+++ b/src/main/java/ru/nanit/limbo/util/Logger.java
@@ -14,6 +14,10 @@ public final class Logger {
         debugLevel = level;
     }
 
+    public static int getLevel() {
+        return debugLevel;
+    }
+
     public static void info(Object msg, Object... args) {
         print(Level.INFO, msg, null, args);
     }