diff --git a/services/cojedzie/stack.yml b/services/cojedzie/stack.yml
index bac3887..9311ceb 100644
--- a/services/cojedzie/stack.yml
+++ b/services/cojedzie/stack.yml
@@ -44,8 +44,25 @@ services:
       COJEDZIE_WORKER_OPTS: '-vv'
       COJEDZIE_WORKER_QUEUES: 'scheduler_default scheduler_hub scheduler_recorder'
 
+  # import jobs run in parallel on every worker (cojedzie ADR 0026)
   worker:
     <<: *worker
+    deploy:
+      mode: replicated
+      replicas: {{ cojedzie_worker_replicas|default(3) }}
+
+  # state the workers share, e.g. the Sentry check-ins of running imports; reached only inside the stack
+  redis:
+    image: redis:{{ cojedzie_redis_version|default('7.4-alpine') }}
+    command: ["redis-server", "--appendonly", "yes"]
+    volumes:
+      - redis_data:/data
+    deploy:
+      mode: replicated
+      replicas: 1
+      resources:
+        limits:
+          memory: 128M
 
   # departure history (cojedzie ADR 0020); reached only inside the stack
   clickhouse:
@@ -128,3 +145,4 @@ volumes:
   clickhouse_data: ~
   mercure_data: ~
   mercure_config: ~
+  redis_data: ~
diff --git a/services/cojedzie/templates/api.env b/services/cojedzie/templates/api.env
index eb0732a..406ca29 100644
--- a/services/cojedzie/templates/api.env
+++ b/services/cojedzie/templates/api.env
@@ -12,3 +12,6 @@ SENTRY_SAMPLE_RATE={{ sentry_sample_rate_api }}
 # departure history; see cojedzie's contrib/agents/wiki/api/departure-history.md
 COJEDZIE_CLICKHOUSE_URL=http://cojedzie:{{ cojedzie_clickhouse_password | urlencode }}@clickhouse:8123/cojedzie
 COJEDZIE_DEPARTURE_HISTORY_RETENTION_DAYS={{ cojedzie_departure_history_retention_days }}
+
+# state shared by workers, e.g. Sentry check-ins of running imports
+COJEDZIE_REDIS_URL=redis://redis:6379