diff --git a/resources/chaosknoten/grafana/docker_compose/compose.yaml.j2 b/resources/chaosknoten/grafana/docker_compose/compose.yaml.j2
index d739b2f..c5b8f2d 100644
--- a/resources/chaosknoten/grafana/docker_compose/compose.yaml.j2
+++ b/resources/chaosknoten/grafana/docker_compose/compose.yaml.j2
@@ -8,6 +8,7 @@ services:
       - '--config.file=/etc/prometheus/prometheus.yml'
       - '--web.enable-remote-write-receiver'
       - '--enable-feature=promql-experimental-functions'
+      - '--storage.tsdb.retention.time=28d'
     ports:
       - 9090:9090
     restart: unless-stopped