diff --git a/playbook.yml b/playbook.yml
index a2231b0..19d39a3 100644
--- a/playbook.yml
+++ b/playbook.yml
@@ -223,7 +223,7 @@
         create_namespace: yes
         wait: yes
         kubeconfig: "{{ kubeconfig.path }}"
-        values: item.values | default('omit')
+        values: "{{ item.values | dict2items | default('omit') }}"
       loop:
         - name: cert-manager
           ref: jetstack/cert-manager