diff --git a/pumpkin-protocol/fuzz/Cargo.lock b/pumpkin-protocol/fuzz/Cargo.lock
index 45d3c7294..d8ab7c8c2 100644
--- a/pumpkin-protocol/fuzz/Cargo.lock
+++ b/pumpkin-protocol/fuzz/Cargo.lock
@@ -33,9 +33,9 @@ checksum = "c3d036a3c4ab069c7b410a2ce876bd74808d2d0888a82667669f8e783a898bf1"
 
 [[package]]
 name = "async-compression"
-version = "0.4.41"
+version = "0.4.42"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d0f9ee0f6e02ffd7ad5816e9464499fba7b3effd01123b515c41d1697c43dad1"
+checksum = "e79b3f8a79cccc2898f31920fc69f304859b3bd567490f75ebf51ae1c792a9ac"
 dependencies = [
  "compression-codecs",
  "compression-core",
@@ -168,9 +168,9 @@ dependencies = [
 
 [[package]]
 name = "compression-codecs"
-version = "0.4.37"
+version = "0.4.38"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "eb7b51a7d9c967fc26773061ba86150f19c50c0d65c887cb1fbe295fd16619b7"
+checksum = "ce2548391e9c1929c21bf6aa2680af86fe4c1b33e6cea9ac1cfeec0bd11218cf"
 dependencies = [
  "compression-core",
  "flate2",
@@ -178,9 +178,9 @@ dependencies = [
 
 [[package]]
 name = "compression-core"
-version = "0.4.31"
+version = "0.4.32"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "75984efb6ed102a0d42db99afb6c1948f0380d1d91808d5529916e6c08b49d8d"
+checksum = "cc14f565cf027a105f7a44ccf9e5b424348421a1d8952a8fc9d499d313107789"
 
 [[package]]
 name = "const-oid"
@@ -665,12 +665,6 @@ version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2304e00983f87ffb38b55b444b5e3b60a884b5d30c0fca7d82fe33449bbe55ea"
 
-[[package]]
-name = "hermit-abi"
-version = "0.5.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fc0fef456e4baa96da950455cd02c081ca953b141298e41db3fc7e36b1da849c"
-
 [[package]]
 name = "hkdf"
 version = "0.12.4"
@@ -876,16 +870,6 @@ dependencies = [
  "autocfg",
 ]
 
-[[package]]
-name = "num_cpus"
-version = "1.17.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "91df4bbde75afed763b708b7eee1e8e7651e02d97f6d5dd763e89367e957b23b"
-dependencies = [
- "hermit-abi",
- "libc",
-]
-
 [[package]]
 name = "once_cell"
 version = "1.21.4"
@@ -1049,7 +1033,6 @@ dependencies = [
 name = "pumpkin-codecs"
 version = "0.1.0-dev+26.1"
 dependencies = [
- "dashmap",
  "either",
  "serde_json",
  "tracing",
@@ -1099,6 +1082,7 @@ dependencies = [
  "serde",
  "thiserror",
  "tracing",
+ "uuid",
 ]
 
 [[package]]
@@ -1172,7 +1156,6 @@ dependencies = [
  "futures",
  "itertools",
  "lz4-java-wrc",
- "num_cpus",
  "pumpkin-config",
  "pumpkin-data",
  "pumpkin-nbt",
@@ -1189,6 +1172,7 @@ dependencies = [
  "tokio-util",
  "tracing",
  "uuid",
+ "xxhash-rust",
 ]
 
 [[package]]
@@ -1909,6 +1893,12 @@ dependencies = [
  "wasmparser",
 ]
 
+[[package]]
+name = "xxhash-rust"
+version = "0.8.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fdd20c5420375476fbd4394763288da7eb0cc0b8c11deed431a91562af7335d3"
+
 [[package]]
 name = "zeroize"
 version = "1.8.2"
diff --git a/pumpkin-protocol/src/bedrock/client/raknet/incompatible_protocol.rs b/pumpkin-protocol/src/bedrock/client/raknet/incompatible_protocol.rs
new file mode 100644
index 000000000..6c1f3503c
--- /dev/null
+++ b/pumpkin-protocol/src/bedrock/client/raknet/incompatible_protocol.rs
@@ -0,0 +1,21 @@
+use crate::{bedrock::RAKNET_MAGIC, serial::PacketWrite};
+use pumpkin_macros::packet;
+
+#[derive(PacketWrite)]
+#[packet(0x19)]
+pub struct CIncompatibleProtocolVersion {
+    protocol_version: u8,
+    magic: [u8; 16],
+    server_guid: u64,
+}
+
+impl CIncompatibleProtocolVersion {
+    #[must_use]
+    pub const fn new(protocol_version: u8, server_guid: u64) -> Self {
+        Self {
+            protocol_version,
+            magic: RAKNET_MAGIC,
+            server_guid,
+        }
+    }
+}
diff --git a/pumpkin-protocol/src/bedrock/client/raknet/mod.rs b/pumpkin-protocol/src/bedrock/client/raknet/mod.rs
index 6db4677e3..c75e08f73 100644
--- a/pumpkin-protocol/src/bedrock/client/raknet/mod.rs
+++ b/pumpkin-protocol/src/bedrock/client/raknet/mod.rs
@@ -1,3 +1,4 @@
 pub mod connection;
+pub mod incompatible_protocol;
 pub mod open_connection;
 pub mod unconnected_pong;
diff --git a/pumpkin/src/net/bedrock/open_connection.rs b/pumpkin/src/net/bedrock/open_connection.rs
index f22225d18..108fa6a13 100644
--- a/pumpkin/src/net/bedrock/open_connection.rs
+++ b/pumpkin/src/net/bedrock/open_connection.rs
@@ -1,9 +1,13 @@
 use std::net::SocketAddr;
 
 use pumpkin_protocol::bedrock::{
-    client::raknet::open_connection::{COpenConnectionReply1, COpenConnectionReply2},
+    client::raknet::{
+        incompatible_protocol::CIncompatibleProtocolVersion,
+        open_connection::{COpenConnectionReply1, COpenConnectionReply2},
+    },
     server::raknet::open_connection::{SOpenConnectionRequest1, SOpenConnectionRequest2},
 };
+use pumpkin_world::CURRENT_BEDROCK_MC_PROTOCOL;
 use tokio::net::UdpSocket;
 
 use crate::{net::bedrock::BedrockClient, server::Server};
@@ -11,10 +15,23 @@ use crate::{net::bedrock::BedrockClient, server::Server};
 impl BedrockClient {
     pub async fn handle_open_connection_1(
         server: &Server,
-        _packet: SOpenConnectionRequest1,
+        packet: SOpenConnectionRequest1,
         addr: SocketAddr,
         socket: &UdpSocket,
     ) {
+        if packet.protocol_version != CURRENT_BEDROCK_MC_PROTOCOL as u8 {
+            Self::send_offline_packet(
+                &CIncompatibleProtocolVersion::new(
+                    CURRENT_BEDROCK_MC_PROTOCOL as u8,
+                    server.server_guid,
+                ),
+                addr,
+                socket,
+            )
+            .await;
+            return;
+        }
+
         Self::send_offline_packet(
             &COpenConnectionReply1::new(server.server_guid, false, 1400),
             addr,