diff --git a/CloudronManifest.json b/CloudronManifest.json
index d4d921d..a2b31f5 100644
--- a/CloudronManifest.json
+++ b/CloudronManifest.json
@@ -5,7 +5,7 @@
   "description": "Next-gen knowledge base that blends docs, whiteboards, and databases for self-hosted teams.",
   "website": "https://affine.pro",
   "contactEmail": "support@affine.pro",
-  "version": "0.1.14",
+  "version": "0.1.15",
   "changelog": "Initial Cloudron packaging",
   "manifestVersion": 2,
   "minBoxVersion": "7.0.0",
diff --git a/start.sh b/start.sh
index 2e260f7..f694902 100644
--- a/start.sh
+++ b/start.sh
@@ -127,18 +127,20 @@ PY
   record_env_var REDIS_SERVER_USERNAME "$username"
   record_env_var REDIS_URL "$CLOUDRON_REDIS_URL"
   record_env_var REDIS_SERVER_URL "$CLOUDRON_REDIS_URL"
-  jq --arg host "$host" \
-     --arg port "$port" \
-     --arg password "$password" \
-     --arg username "$username" \
-     --arg db "$db" \
-     '.redis.host = $host
-      | .redis.port = ($port|tonumber)
-      | .redis.password = $password
-      | .redis.username = $username
-      | .redis.db = ($db|tonumber)' \
-     "$APP_DATA_DIR/config/config.json" > "$APP_DATA_DIR/config/config.json.tmp"
-  mv "$APP_DATA_DIR/config/config.json.tmp" "$APP_DATA_DIR/config/config.json"
+  python3 - <<'PY'
+import json
+import os
+from pathlib import Path
+config_path = Path(os.environ['APP_DATA_DIR']) / 'config' / 'config.json'
+data = json.loads(config_path.read_text())
+redis = data.setdefault('redis', {})
+redis['host'] = os.environ.get('REDIS_SERVER_HOST', '')
+redis['port'] = int(os.environ.get('REDIS_SERVER_PORT') or 6379)
+redis['password'] = os.environ.get('REDIS_SERVER_PASSWORD', '')
+redis['username'] = os.environ.get('REDIS_SERVER_USERNAME', '')
+redis['db'] = int(os.environ.get('REDIS_SERVER_DATABASE') or 0)
+config_path.write_text(json.dumps(data, indent=2))
+PY
   log "Configured Redis endpoint"
 }