diff --git a/docker-compose.yml b/docker-compose.yml
index 25376f7..7eb5f88 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -1,6 +1,7 @@
 services:
   db:
     image: postgres:16-alpine
+    shm_size: 1g  # parallel workers (np. seo.sitemap_index) potrzebują >64MB /dev/shm
     environment:
       POSTGRES_USER: ${POSTGRES_USER:-goon}
       POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:-goon}