diff --git a/tasks/main.yml b/tasks/main.yml
index 5231d3e..5cd18c3 100644
--- a/tasks/main.yml
+++ b/tasks/main.yml
@@ -9,6 +9,11 @@
     release_namespace: grafana
     create_namespace: true
     values:
+      global:
+        security:
+          # Required for bitnamilegacy images; the chart otherwise refuses to
+          # render (https://github.com/bitnami/charts/issues/30850).
+          allowInsecureImages: true
       image:
         repository: "{{ grafana_image_repository }}"
         tag: "{{ grafana_image_tag }}"