diff --git a/pycrdt_websocket/awareness.py b/pycrdt_websocket/awareness.py
index 8fea423..5935326 100644
--- a/pycrdt_websocket/awareness.py
+++ b/pycrdt_websocket/awareness.py
@@ -1,65 +1,2 @@
-from __future__ import annotations
-
-import json
-import time
-from typing import Any
-
-from pycrdt import Decoder, read_message
-
-
-class Awareness:
-    def __init__(self, ydoc):
-        self.client_id = ydoc.client_id
-        self.meta = {}
-        self.states = {}
-
-    def get_changes(self, message: bytes) -> dict[str, Any]:
-        message = read_message(message)
-        decoder = Decoder(message)
-        timestamp = int(time.time() * 1000)
-        added = []
-        updated = []
-        filtered_updated = []
-        removed = []
-        states = []
-        length = decoder.read_var_uint()
-        for _ in range(length):
-            client_id = decoder.read_var_uint()
-            clock = decoder.read_var_uint()
-            state_str = decoder.read_var_string()
-            state = None if not state_str else json.loads(state_str)
-            if state is not None:
-                states.append(state)
-            client_meta = self.meta.get(client_id)
-            prev_state = self.states.get(client_id)
-            curr_clock = 0 if client_meta is None else client_meta["clock"]
-            if curr_clock < clock or (
-                curr_clock == clock and state is None and client_id in self.states
-            ):
-                if state is None:
-                    if client_id == self.client_id and self.states.get(client_id) is not None:
-                        clock += 1
-                    else:
-                        if client_id in self.states:
-                            del self.states[client_id]
-                else:
-                    self.states[client_id] = state
-                self.meta[client_id] = {
-                    "clock": clock,
-                    "last_updated": timestamp,
-                }
-                if client_meta is None and state is not None:
-                    added.append(client_id)
-                elif client_meta is not None and state is None:
-                    removed.append(client_id)
-                elif state is not None:
-                    if state != prev_state:
-                        filtered_updated.append(client_id)
-                    updated.append(client_id)
-        return {
-            "added": added,
-            "updated": updated,
-            "filtered_updated": filtered_updated,
-            "removed": removed,
-            "states": states,
-        }
+# Backward compatibility.
+from pycrdt import Awareness as Awareness
diff --git a/pyproject.toml b/pyproject.toml
index 5bbd84f..5eeb416 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -30,7 +30,7 @@ classifiers = [
 dependencies = [
     "anyio >=3.6.2,<5",
     "sqlite-anyio >=0.2.3,<0.3.0",
-    "pycrdt >=0.9.0,<0.10.0",
+    "pycrdt >=0.9.16,<0.10.0",
 ]
 
 [project.optional-dependencies]