diff --git a/roles/wsgi_website/molecule/default/playbook.yml b/roles/wsgi_website/molecule/default/playbook.yml
index e98fa0928c876936a4e7ea7e8accc624378951ac..05ee8867ba63c15c189bcb14d3b212537eda4fa4 100644
--- a/roles/wsgi_website/molecule/default/playbook.yml
+++ b/roles/wsgi_website/molecule/default/playbook.yml
@@ -1,7 +1,7 @@
 ---
 
 - hosts: wsgi-website
-  become: yes
+  become: true
   vars:
     # common
     ca_certificates:
@@ -26,7 +26,7 @@
         - comment: Custom missing page.
           value: error_page 404 /my/own/error/page;
       admin_uid: 5000
-      enforce_https: no
+      enforce_https: false
       environment_indicator:
         background_colour: "#ff0000"
         text_colour: "#00ff00"
@@ -49,7 +49,7 @@
         - /static/
         - /media/
       uid: 5001
-      use_paste: no
+      use_paste: false
       virtualenv_packages:
         - dnspython==1.15.0,<1.20.0
         - ptpython==0.41
@@ -60,7 +60,7 @@
 
     - role: wsgi_website
       fqdn: parameters-paste-req
-      use_paste: yes
+      use_paste: true
       virtualenv_packages:
         - click==6.7
         - Flask==0.12.2
@@ -80,7 +80,7 @@
       https_tls_key: "{{ lookup('file', 'tests/data/x509/parameters-paste-req_https.key.pem') }}"
 
 - hosts: wsgi-website
-  become: yes
+  become: true
   tasks:
     # parameters-mandatory application
     - name: Set-up directories where application files are hosted at