diff --git a/roles/prometheus/vars/main.yml b/roles/prometheus/vars/main.yml
index 0337795..44ea257 100644
--- a/roles/prometheus/vars/main.yml
+++ b/roles/prometheus/vars/main.yml
@@ -52,7 +52,7 @@ prometheus_docker: {
         '"--web.console.templates=/usr/share/prometheus/consoles"',
         '"--web.external-url={{ http_s}}://{{ inventory_hostname }}-prometheus.{{ domain }}"',
         '"--web.enable-lifecycle"',
-        '"--storage.tsdb.retention.time=15w"',
+        '"--storage.tsdb.retention.time=12w"',
       ],
       volumes: [
         '"./config/prometheus/:/etc/prometheus/:ro"',