diff --git a/_data/rules.yml b/_data/rules.yml
index 37715cb..94f2293 100644
--- a/_data/rules.yml
+++ b/_data/rules.yml
@@ -1549,7 +1549,7 @@ groups:
               - name: Kubernetes Pod OOM killed
                 description: Pod {{ $labels.pod }} in namespace {{ $labels.namespace }} is OOMKilled
                 query: kube_pod_container_status_last_terminated_reason{reason="OOMKilled"} > 0
-                severity: Critical
+                severity: critical
               - name: Kubernetes Pod not healthy
                 description: Pod has been in a non-ready state for longer than an hour.
                 query: 'min_over_time(sum by (namespace, pod) (kube_pod_status_phase{phase=~"Pending|Unknown|Failed"})[1h:]) > 0'