diff --git a/content/docs/setup/kubernetes/upgrade/steps/index.md b/content/docs/setup/kubernetes/upgrade/steps/index.md
index d318b3c7a1..472b21d114 100644
--- a/content/docs/setup/kubernetes/upgrade/steps/index.md
+++ b/content/docs/setup/kubernetes/upgrade/steps/index.md
@@ -13,10 +13,10 @@ please ensure your Istio control plane components and your applications are
 highly available with multiple replicas (as multi-replica Citadel is still
 under development, Citadel should be deployed with one replica).
 
-{{ warning }}
+{{< warning >}}
 Citadel does not support multiple instances. Running multiple Citadel instances
 may introduce race conditions and lead to system outages.
-{{ /warning }}
+{{< /warning >}}
 
 This flow assumes that the Istio components are installed and upgraded in the
 `istio-system` namespace.