diff --git a/manifest/observability.yaml b/manifest/observability.yaml
index d4e4f17..de37e2f 100644
--- a/manifest/observability.yaml
+++ b/manifest/observability.yaml
@@ -39,7 +39,7 @@ spec:
   source:
     chart: grafana
     repoURL: https://grafana.github.io/helm-charts
-    targetRevision: 8.5.5
+    targetRevision: 8.5.6
     helm:
       valuesObject:
         adminUser: admin