diff --git a/examples/conway.rs b/examples/conway.rs
index acf4c55..c21e3bd 100644
--- a/examples/conway.rs
+++ b/examples/conway.rs
@@ -9,7 +9,7 @@ use num::Integer;
 use rayon::iter::{IndexedParallelIterator, IntoParallelRefMutIterator, ParallelIterator};
 use valence::biome::Biome;
 use valence::block::BlockState;
-use valence::client::{ClientId, Event, GameMode, Hand};
+use valence::client::{ClientId, Event, Hand};
 use valence::config::{Config, ServerListPing};
 use valence::dimension::{Dimension, DimensionId};
 use valence::entity::data::Pose;
@@ -131,7 +131,6 @@ impl Config for Game {
                 }
 
                 client.spawn(world_id);
-                client.set_game_mode(GameMode::Survival);
                 client.teleport(spawn_pos, 0.0, 0.0);
 
                 world.meta.player_list_mut().insert(
diff --git a/src/client.rs b/src/client.rs
index 17fba17..7111b0c 100644
--- a/src/client.rs
+++ b/src/client.rs
@@ -30,7 +30,7 @@ use crate::protocol_inner::packets::play::s2c::{
     MoveEntityRotation, PlayerPosition, PlayerPositionFlags, RegistryCodec, RemoveEntities,
     Respawn, RotateHead, S2cPlayPacket, SetChunkCacheCenter, SetChunkCacheRadius,
     SetEntityMetadata, SetEntityMotion, SetSubtitleText, SetTitleText, SpawnPosition, SystemChat,
-    TeleportEntity, ENTITY_EVENT_MAX_BOUND,
+    TeleportEntity, UpdateAttributes, UpdateAttributesProperty, ENTITY_EVENT_MAX_BOUND,
 };
 use crate::protocol_inner::{BoundedInt, ByteAngle, Nbt, RawBytes, VarInt};
 use crate::server::{C2sPacketChannels, NewClientData, SharedServer};
@@ -195,7 +195,10 @@ pub struct Client {
     old_game_mode: GameMode,
     settings: Option<Settings>,
     dug_blocks: Vec<i32>,
+    /// Should be sent after login packet.
     msgs_to_send: Vec<Text>,
+    attack_speed: f64,
+    movement_speed: f64,
     flags: ClientFlags,
     /// The data for the client's own player entity.
     player_data: Player,
@@ -216,7 +219,9 @@ pub(crate) struct ClientFlags {
     /// If the last sent keepalive got a response.
     got_keepalive: bool,
     hardcore: bool,
-    #[bits(7)]
+    attack_speed_modified: bool,
+    movement_speed_modified: bool,
+    #[bits(5)]
     _pad: u8,
 }
 
@@ -256,6 +261,8 @@ impl Client {
             settings: None,
             dug_blocks: Vec::new(),
             msgs_to_send: Vec::new(),
+            attack_speed: 4.0,
+            movement_speed: 0.7,
             flags: ClientFlags::new()
                 .with_modified_spawn_position(true)
                 .with_got_keepalive(true),
@@ -423,6 +430,32 @@ impl Client {
         }
     }
 
+    /// Gets the attack cooldown speed.
+    pub fn attack_speed(&self) -> f64 {
+        self.attack_speed
+    }
+
+    /// Sets the attack cooldown speed.
+    pub fn set_attack_speed(&mut self, speed: f64) {
+        if self.attack_speed != speed {
+            self.attack_speed = speed;
+            self.flags.set_attack_speed_modified(true);
+        }
+    }
+
+    /// Gets the speed at which the client can run on the ground.
+    pub fn movement_speed(&self) -> f64 {
+        self.movement_speed
+    }
+
+    /// Sets the speed at which the client can run on the ground.
+    pub fn set_movement_speed(&mut self, speed: f64) {
+        if self.movement_speed != speed {
+            self.movement_speed = speed;
+            self.flags.set_movement_speed_modified(true);
+        }
+    }
+
     /// Removes the current title from the client's screen.
     pub fn clear_title(&mut self) {
         self.send_packet(ClearTitles { reset: true });
@@ -914,6 +947,33 @@ impl Client {
                 .diff_packets(|pkt| self.send_packet(pkt));
         }
 
+        // Set player attributes
+        if self.flags.attack_speed_modified() {
+            self.flags.set_attack_speed_modified(false);
+
+            self.send_packet(UpdateAttributes {
+                entity_id: VarInt(0),
+                properties: vec![UpdateAttributesProperty {
+                    key: ident!("generic.attack_speed"),
+                    value: self.attack_speed,
+                    modifiers: Vec::new(),
+                }],
+            });
+        }
+
+        if self.flags.movement_speed_modified() {
+            self.flags.set_movement_speed_modified(false);
+
+            self.send_packet(UpdateAttributes {
+                entity_id: VarInt(0),
+                properties: vec![UpdateAttributesProperty {
+                    key: ident!("generic.movement_speed"),
+                    value: self.movement_speed,
+                    modifiers: Vec::new(),
+                }],
+            });
+        }
+
         // Update the players spawn position (compass position)
         if self.flags.modified_spawn_position() {
             self.flags.set_modified_spawn_position(false);
diff --git a/src/protocol_inner/packets.rs b/src/protocol_inner/packets.rs
index 21ee823..3f289e1 100644
--- a/src/protocol_inner/packets.rs
+++ b/src/protocol_inner/packets.rs
@@ -1233,6 +1233,29 @@ pub mod play {
             }
         }
 
+        def_struct! {
+            UpdateAttributes 0x65 {
+                entity_id: VarInt,
+                properties: Vec<UpdateAttributesProperty>,
+            }
+        }
+
+        def_struct! {
+            UpdateAttributesProperty {
+                key: Ident,
+                value: f64,
+                modifiers: Vec<UpdateAttributesModifiers>
+            }
+        }
+
+        def_struct! {
+            UpdateAttributesModifiers {
+                uuid: Uuid,
+                amount: f64,
+                operation: u8,
+            }
+        }
+
         def_packet_group! {
             S2cPlayPacket {
                 AddEntity,
@@ -1276,6 +1299,7 @@ pub mod play {
                 SystemChat,
                 TabList,
                 TeleportEntity,
+                UpdateAttributes,
             }
         }
     }