diff --git a/argocd/manifests/grafana/alerting.yaml b/argocd/manifests/grafana/alerting.yaml
index abc4c0f..69dbec5 100644
--- a/argocd/manifests/grafana/alerting.yaml
+++ b/argocd/manifests/grafana/alerting.yaml
@@ -323,7 +323,7 @@ groups:
       - uid: argocd-app-out-of-sync
         title: ArgoCDAppOutOfSync
         condition: C
-        for: 30m
+        for: 5m
         noDataState: OK
         execErrState: Alerting
         annotations:
@@ -337,7 +337,7 @@ groups:
           - refId: A
             datasourceUid: prometheus
             relativeTimeRange:
-              from: 300
+              from: 60
               to: 0
             model:
               expr: >-
diff --git a/docs/changelog.d/+tune-argocd-outofsync-alert.infra.md b/docs/changelog.d/+tune-argocd-outofsync-alert.infra.md
new file mode 100644
index 0000000..cac4b46
--- /dev/null
+++ b/docs/changelog.d/+tune-argocd-outofsync-alert.infra.md
@@ -0,0 +1 @@
+Tighten ArgoCDAppOutOfSync alert: reduce pending duration from 30m to 5m and lookback window from 5m to 1m so alerts clear faster after sync.