diff --git a/.github/workflows/requirements2png.yml b/.github/workflows/requirements2png.yml
index a132e12..f12e0c3 100644
--- a/.github/workflows/requirements2png.yml
+++ b/.github/workflows/requirements2png.yml
@@ -31,5 +31,5 @@ jobs:
         uses: ad-m/github-push-action@master
         with:
           directory: ${{ github.repository }}
-          force: yes
+          force: true
           branch: png
diff --git a/.yamllint b/.yamllint
index 10d5946..cc50726 100644
--- a/.yamllint
+++ b/.yamllint
@@ -11,9 +11,6 @@ rules:
   line-length: disable
   truthy:
     check-keys: no
-    allowed-values:
-      - "yes"
-      - "no"
 
 ignore: |
   .tox/
diff --git a/README.md b/README.md
index 3a83a90..17de9f3 100644
--- a/README.md
+++ b/README.md
@@ -14,8 +14,8 @@ This example is taken from [`molecule/default/converge.yml`](https://github.com/
 ---
 - name: Converge
   hosts: all
-  become: yes
-  gather_facts: yes
+  become: true
+  gather_facts: true
 
   roles:
     - role: robertdebock.dovecot
@@ -27,8 +27,8 @@ The machine needs to be prepared. In CI this is done using [`molecule/default/pr
 ---
 - name: Prepare
   hosts: all
-  become: yes
-  gather_facts: no
+  become: true
+  gather_facts: false
 
   roles:
     - role: robertdebock.bootstrap
diff --git a/handlers/main.yml b/handlers/main.yml
index 9e1106e..3bc77bc 100644
--- a/handlers/main.yml
+++ b/handlers/main.yml
@@ -5,7 +5,7 @@
   ansible.builtin.copy:
     src: "{{ item.src }}"
     dest: "{{ item.dest }}"
-    remote_src: yes
+    remote_src: true
     mode: "0640"
   loop:
     - src: /usr/share/doc/dovecot/example-config/dovecot.conf
diff --git a/molecule/default/converge.yml b/molecule/default/converge.yml
index a76f202..fcae15a 100644
--- a/molecule/default/converge.yml
+++ b/molecule/default/converge.yml
@@ -1,8 +1,8 @@
 ---
 - name: Converge
   hosts: all
-  become: yes
-  gather_facts: yes
+  become: true
+  gather_facts: true
 
   roles:
     - role: ansible-role-dovecot
diff --git a/molecule/default/prepare.yml b/molecule/default/prepare.yml
index f76c7bf..3687735 100644
--- a/molecule/default/prepare.yml
+++ b/molecule/default/prepare.yml
@@ -1,8 +1,8 @@
 ---
 - name: Prepare
   hosts: all
-  become: yes
-  gather_facts: no
+  become: true
+  gather_facts: false
 
   roles:
     - role: robertdebock.bootstrap
diff --git a/molecule/default/verify.yml b/molecule/default/verify.yml
index 33b4171..d3466b4 100644
--- a/molecule/default/verify.yml
+++ b/molecule/default/verify.yml
@@ -1,8 +1,8 @@
 ---
 - name: Verify
   hosts: all
-  become: yes
-  gather_facts: no
+  become: true
+  gather_facts: false
 
   tasks:
     - name: Check if ports are open
diff --git a/tasks/assert.yml b/tasks/assert.yml
index 3310c9a..c328ead 100644
--- a/tasks/assert.yml
+++ b/tasks/assert.yml
@@ -6,7 +6,7 @@
       - dovecot_mailbox_location is defined
       - dovecot_mailbox_location is string
       - dovecot_mailbox_location is not none
-    quiet: yes
+    quiet: true
 
 - name: assert | Test dovecot_mail_access_groups
   ansible.builtin.assert:
@@ -14,4 +14,4 @@
       - dovecot_mail_access_groups is defined
       - dovecot_mail_access_groups is string
       - dovecot_mail_access_groups is not none
-    quiet: yes
+    quiet: true
diff --git a/tasks/main.yml b/tasks/main.yml
index 49077ec..1990a06 100644
--- a/tasks/main.yml
+++ b/tasks/main.yml
@@ -4,7 +4,7 @@
 - name: Import assert.yml
   ansible.builtin.import_tasks:
     file: assert.yml
-  run_once: yes
+  run_once: true
   delegate_to: localhost
 
 - name: Install dovecot
@@ -48,4 +48,4 @@
   ansible.builtin.service:
     name: "{{ dovecot_service }}"
     state: started
-    enabled: yes
+    enabled: true