diff --git a/k8s/apps/vpn/shadowsocks.yaml b/k8s/apps/vpn/shadowsocks.yaml
index da6e972..730650b 100644
--- a/k8s/apps/vpn/shadowsocks.yaml
+++ b/k8s/apps/vpn/shadowsocks.yaml
@@ -114,7 +114,7 @@ spec:
           args:
             - |
               cat /prometheus/config.yml | sed -e "s/_HOSTNAME_/${HOSTNAME}/g" -e "s/_PROM_PASS_/${PROM_PASS}/g" -e "s/_PROM_USER_/${PROM_USER}/g" > /prometheus/real_config.yml &&
-              exec prometheus --config.file=/prometheus/real_config.yml --log.level=info --web.enable-lifecycle --web.enable-admin-api --web.listen-address=127.0.0.1:3478
+              exec prometheus --config.file=/prometheus/real_config.yml --log.level=info --web.enable-lifecycle --web.enable-admin-api --web.listen-address=127.0.0.1:3478 --storage.tsdb.retention.time=1d
           volumeMounts:
             - name: prometheus-config-volume
               mountPath: /prometheus/config.yml