diff --git a/.github/workflows/test-docs.yml b/.github/workflows/test-docs.yml
index db76112d..fe95d423 100644
--- a/.github/workflows/test-docs.yml
+++ b/.github/workflows/test-docs.yml
@@ -20,7 +20,9 @@ jobs:
           POSTGRES_PASSWORD: postgres
           POSTGRES_DB: postgres
         options: --health-cmd pg_isready --health-interval 10s --health-timeout 5s --health-retries 5
-
+      redis:
+        image: redis
+        options: --health-cmd "redis-cli ping" --health-interval 10s --health-timeout 5s --health-retries 5
     strategy:
       fail-fast: false
       matrix:
diff --git a/umap/tests/integration/test_websocket_sync.py b/umap/tests/integration/test_websocket_sync.py
index 0a2306cf..a69e134f 100644
--- a/umap/tests/integration/test_websocket_sync.py
+++ b/umap/tests/integration/test_websocket_sync.py
@@ -1,6 +1,8 @@
 import re
 
 import pytest
+import redis
+from django.conf import settings
 from playwright.sync_api import expect
 
 from umap.models import DataLayer, Map
@@ -9,6 +11,18 @@ from ..base import DataLayerFactory, MapFactory
 
 DATALAYER_UPDATE = re.compile(r".*/datalayer/update/.*")
 
+pytestmark = pytest.mark.django_db
+
+
+def setup_function():
+    # Sync client to prevent headache with pytest / pytest-asyncio and async
+    client = redis.from_url(settings.REDIS_URL)
+    # Make sure there are no dead peers in the Redis hash, otherwise asking for
+    # operations from another peer may never be answered
+    # FIXME this should not happen in an ideal world
+    assert client.connection_pool.connection_kwargs["db"] == 15
+    client.flushdb()
+
 
 @pytest.mark.xdist_group(name="websockets")
 def test_websocket_connection_can_sync_markers(new_page, asgi_live_server, tilelayer):
diff --git a/umap/tests/settings.py b/umap/tests/settings.py
index b776c083..41de66d3 100644
--- a/umap/tests/settings.py
+++ b/umap/tests/settings.py
@@ -29,3 +29,5 @@ PASSWORD_HASHERS = [
 WEBSOCKET_ENABLED = True
 WEBSOCKET_BACK_PORT = "8010"
 WEBSOCKET_FRONT_URI = "ws://localhost:8010"
+
+REDIS_URL = "redis://localhost:6379/15"