diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 70e6297..d204d7b 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -45,6 +45,7 @@ jobs:
       matrix:
         include:
           - distro: debian10
+            ansible-version: '>=9, <10'
           - distro: debian11
           - distro: debian12
           - distro: ubuntu1804
diff --git a/tasks/main.yml b/tasks/main.yml
index e50749c..4298c64 100644
--- a/tasks/main.yml
+++ b/tasks/main.yml
@@ -37,7 +37,7 @@
     dest: "{{ postfix_mailname_file }}"
     owner: root
     group: root
-    mode: 0644
+    mode: '0644'
   notify: restart postfix
   tags:
     - configuration
@@ -50,7 +50,7 @@
     dest: "{{ postfix_main_cf }}"
     owner: root
     group: root
-    mode: 0644
+    mode: '0644'
   notify: restart postfix
   tags:
     - configuration
@@ -63,7 +63,7 @@
     dest: "{{ postfix_sasl_passwd_file }}"
     owner: root
     group: root
-    mode: 0600
+    mode: '0600'
   when:
     - postfix_relayhost | length
     - postfix_sasl_auth_enable | bool
@@ -82,7 +82,7 @@
     dest: "{{ postfix_aliases_file }}"
     owner: root
     group: root
-    mode: 0644
+    mode: '0644'
   notify:
     - new aliases
     - restart postfix
@@ -112,7 +112,7 @@
     line: '{{ item.virtual }} {{ item.alias }}'
     owner: root
     group: root
-    mode: 0644
+    mode: '0644'
     create: true
     state: present
   with_items: "{{ postfix_virtual_aliases }}"
@@ -131,7 +131,7 @@
     line: '{{ item.sender }} {{ item.rewrite }}'
     owner: root
     group: root
-    mode: 0644
+    mode: '0644'
     create: true
     state: present
   with_items: "{{ postfix_sender_canonical_maps }}"
@@ -150,7 +150,7 @@
     line: '{{ item.recipient }} {{ item.rewrite }}'
     owner: root
     group: root
-    mode: 0644
+    mode: '0644'
     create: true
     state: present
   with_items: "{{ postfix_recipient_canonical_maps }}"
@@ -169,7 +169,7 @@
     line: '{{ item.pattern }} {{ item.result }}'
     owner: root
     group: root
-    mode: 0644
+    mode: '0644'
     create: true
     state: present
   with_items: "{{ postfix_transport_maps }}"
@@ -188,7 +188,7 @@
     line: '{{ item.pattern }} {{ item.result }}'
     owner: root
     group: root
-    mode: 0644
+    mode: '0644'
     create: true
     state: present
   with_items: "{{ postfix_sender_dependent_relayhost_maps }}"
@@ -207,7 +207,7 @@
     line: '{{ item.pattern }} {{ item.result }}'
     owner: root
     group: root
-    mode: 0644
+    mode: '0644'
     create: true
     state: present
   with_items: "{{ postfix_smtp_generic_maps }}"
@@ -225,7 +225,7 @@
     dest: "{{ postfix_header_checks_file }}"
     owner: root
     group: root
-    mode: 0644
+    mode: '0644'
   notify:
     - restart postfix
   tags:
diff --git a/tests/test.yml b/tests/test.yml
index be2b897..6ca55c7 100644
--- a/tests/test.yml
+++ b/tests/test.yml
@@ -1,6 +1,7 @@
 # test file
 ---
-- hosts: localhost
+- name: converge
+  hosts: localhost
   connection: local
   become: true
   roles:
diff --git a/tests/vagrant.yml b/tests/vagrant.yml
index afdaebc..c51aabf 100644
--- a/tests/vagrant.yml
+++ b/tests/vagrant.yml
@@ -1,6 +1,7 @@
 # test file
 ---
-- hosts: all
+- name: converge
+  hosts: all
   remote_user: vagrant
   become: true
   roles: