diff --git a/protocol/src/protocol/packet.rs b/protocol/src/protocol/packet.rs
index d56b334..42bdafe 100644
--- a/protocol/src/protocol/packet.rs
+++ b/protocol/src/protocol/packet.rs
@@ -1024,6 +1024,17 @@ state_packets!(
             }
             /// ChunkData sends or updates a single chunk on the client. If New is set
             /// then biome data should be sent too.
+            packet ChunkData_Biomes3D_bool {
+                field chunk_x: i32 =,
+                field chunk_z: i32 =,
+                field new: bool =,
+                field ignore_old_data: bool =,
+                field bitmask: VarInt =,
+                field heightmaps: Option<nbt::NamedTag> =,
+                field biomes: Biomes3D = when(|p: &ChunkData_Biomes3D_bool| p.new),
+                field data: LenPrefixedBytes<VarInt> =,
+                field block_entities: LenPrefixed<VarInt, Option<nbt::NamedTag>> =,
+            }
             packet ChunkData_Biomes3D {
                 field chunk_x: i32 =,
                 field chunk_z: i32 =,
diff --git a/protocol/src/protocol/versions/v1_16_1.rs b/protocol/src/protocol/versions/v1_16_1.rs
index 1cbfaa3..6c63576 100644
--- a/protocol/src/protocol/versions/v1_16_1.rs
+++ b/protocol/src/protocol/versions/v1_16_1.rs
@@ -90,7 +90,7 @@ protocol_packet_ids!(
             0x1e => ChangeGameState
             0x1f => WindowOpenHorse
             0x20 => KeepAliveClientbound_i64
-            0x21 => ChunkData_Biomes3D // TODO
+            0x21 => ChunkData_Biomes3D_bool
             0x22 => Effect
             0x23 => Particle_f64
             0x24 => UpdateLight // TODO
diff --git a/src/server/mod.rs b/src/server/mod.rs
index ada9d58..b3f0290 100644
--- a/src/server/mod.rs
+++ b/src/server/mod.rs
@@ -519,6 +519,7 @@ impl Server {
                             KeepAliveClientbound_i64 => on_keep_alive_i64,
                             KeepAliveClientbound_VarInt => on_keep_alive_varint,
                             KeepAliveClientbound_i32 => on_keep_alive_i32,
+                            ChunkData_Biomes3D_bool => on_chunk_data_biomes3d_bool,
                             ChunkData => on_chunk_data,
                             ChunkData_Biomes3D => on_chunk_data_biomes3d,
                             ChunkData_HeightMap => on_chunk_data_heightmap,
@@ -1764,6 +1765,22 @@ impl Server {
         }
     }
 
+    fn on_chunk_data_biomes3d_bool(
+        &mut self,
+        chunk_data: packet::play::clientbound::ChunkData_Biomes3D_bool,
+    ) {
+        self.world
+            .load_chunk115(
+                chunk_data.chunk_x,
+                chunk_data.chunk_z,
+                chunk_data.new,
+                chunk_data.bitmask.0 as u16,
+                chunk_data.data.data,
+            )
+            .unwrap();
+        self.load_block_entities(chunk_data.block_entities.data);
+    }
+
     fn on_chunk_data_biomes3d(
         &mut self,
         chunk_data: packet::play::clientbound::ChunkData_Biomes3D,