diff --git a/chart/templates/cluster-permission.yaml b/chart/templates/cluster-permission.yaml
index 998a81a..801928b 100644
--- a/chart/templates/cluster-permission.yaml
+++ b/chart/templates/cluster-permission.yaml
@@ -77,6 +77,7 @@ spec:
             drop:
             - ALL
           privileged: false
+          readOnlyRootFilesystem: true
         terminationMessagePath: /dev/termination-log
         terminationMessagePolicy: File
       hostIPC: false