diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 3b59af2..93f513f 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -72,3 +72,26 @@ jobs:
 
       - name: Run tests
         run: uv run pytest
+
+  test-minimum-websockets:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.10'
+
+      - name: Install uv
+        uses: astral-sh/setup-uv@38f3f104447c67c051c4a08e39b64a148898af3a # v4
+
+      - name: Install dependencies
+        run: |
+          uv sync --all-extras
+          uv pip install 'websockets==13.0'
+
+      - name: Run tests with minimum websockets
+        run: |
+          uv run --no-sync python -c 'import websockets; assert websockets.__version__ == "13.0"'
+          uv run --no-sync pytest
diff --git a/polymarket_us/websocket/base.py b/polymarket_us/websocket/base.py
index b2f3db1..001022d 100644
--- a/polymarket_us/websocket/base.py
+++ b/polymarket_us/websocket/base.py
@@ -9,7 +9,7 @@
 from typing import Any
 
 import websockets
-from websockets.asyncio.client import ClientConnection
+from websockets.asyncio.client import ClientConnection, connect
 
 from polymarket_us.auth import create_auth_headers
 from polymarket_us.errors import PolymarketUSError
@@ -50,7 +50,7 @@ async def connect(self) -> None:
         url = f"{self.base_url}{self.path}"
         headers = create_auth_headers(self.key_id, self.secret_key, "GET", self.path)
 
-        self._ws = await websockets.connect(url, additional_headers=headers)
+        self._ws = await connect(url, additional_headers=headers)
         self._emit("open")
 
         # Start message handler
diff --git a/pyproject.toml b/pyproject.toml
index 7558736..c129bd8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "polymarket-us"
-version = "1.0.0"
+version = "1.0.1"
 description = "Polymarket US Python SDK"
 readme = "README.md"
 license = "MIT"
@@ -35,7 +35,7 @@ classifiers = [
 dependencies = [
     "httpx>=0.27.0",
     "pynacl>=1.5.0",
-    "websockets>=12.0",
+    "websockets>=13.0",
 ]
 
 [project.optional-dependencies]
diff --git a/tests/test_websocket.py b/tests/test_websocket.py
index 46a9a41..28cb762 100644
--- a/tests/test_websocket.py
+++ b/tests/test_websocket.py
@@ -1,6 +1,13 @@
 """Tests for WebSocket functionality."""
 
+import asyncio
+import base64
+from typing import Literal
+
 import pytest
+from nacl.signing import SigningKey
+from websockets.asyncio.server import ServerConnection, serve
+from websockets.http11 import Request
 
 from polymarket_us import AuthenticationError, PolymarketUS
 from polymarket_us.websocket import MarketsWebSocket, PrivateWebSocket
@@ -8,6 +15,45 @@
 TEST_SECRET_KEY = "nWGxne/9WmC6hEr0kuwsxERJxWl7MmkZcDusAxyuf2A="
 
 
+@pytest.mark.parametrize("stream", ["markets", "private"])
+async def test_connect_sends_auth_headers(stream: Literal["markets", "private"]) -> None:
+    requests: asyncio.Queue[Request] = asyncio.Queue()
+
+    async def handler(connection: ServerConnection) -> None:
+        assert connection.request is not None
+        await requests.put(connection.request)
+        await connection.send('{"heartbeat": {}}')
+        await connection.wait_closed()
+
+    async with serve(handler, "127.0.0.1", 0, close_timeout=1) as server:
+        port = server.sockets[0].getsockname()[1]
+        with PolymarketUS(
+            key_id="test-key",
+            secret_key=TEST_SECRET_KEY,
+            api_base_url=f"http://127.0.0.1:{port}",
+        ) as client:
+            ws = client.ws.markets() if stream == "markets" else client.ws.private()
+            heartbeat = asyncio.Event()
+            ws.on("heartbeat", heartbeat.set)
+            try:
+                await asyncio.wait_for(ws.connect(), timeout=5)
+                request = await asyncio.wait_for(requests.get(), timeout=5)
+                assert request.path == f"/v1/ws/{stream}"
+                assert request.headers["X-PM-Access-Key"] == "test-key"
+                timestamp = request.headers["X-PM-Timestamp"]
+                assert timestamp.isdigit()
+                signature = base64.b64decode(request.headers["X-PM-Signature"])
+                signing_key = SigningKey(base64.b64decode(TEST_SECRET_KEY))
+                signing_key.verify_key.verify(
+                    (timestamp + "GET" + request.path).encode(), signature
+                )
+                await asyncio.wait_for(heartbeat.wait(), timeout=5)
+                assert ws.is_connected
+            finally:
+                await asyncio.wait_for(ws.close(), timeout=5)
+            assert not ws.is_connected
+
+
 class TestWebSocketFactory:
     """Tests for WebSocket factory."""