diff --git a/meta/main.yml b/meta/main.yml
index 2b57c8e..d9e4ac7 100644
--- a/meta/main.yml
+++ b/meta/main.yml
@@ -18,6 +18,10 @@ galaxy_info:
     - name: Ubuntu
       versions:
         - focal
+    - name: Debian
+      versions:
+        - buster
+        - bullseye
   galaxy_tags:
     - netbox
     - networking
diff --git a/molecule/default/requirements.yml b/molecule/default/requirements.yml
index d198b9f..1b958ee 100644
--- a/molecule/default/requirements.yml
+++ b/molecule/default/requirements.yml
@@ -5,6 +5,6 @@ roles:
   - name: geerlingguy.postgresql
     scm: git
     src: 'git+https://github.com/geerlingguy/ansible-role-postgresql'
-    version: 3.1.0
+    version: 3.2.1
 
   - name: geerlingguy.redis
diff --git a/tasks/install.amazon.yml b/tasks/install.amazon.yml
index 1365463..943c9f8 100644
--- a/tasks/install.amazon.yml
+++ b/tasks/install.amazon.yml
@@ -15,14 +15,14 @@
   register: amzn2extras
   changed_when: amzn2extras is failed
   with_items:
-    - python3.8
+    - "{{ python_packages }}"
     - postgresql12
 
 - name: install.amazon | enable required extras
   ansible.builtin.command: "amazon-linux-extras enable {{ item }} "
   become: yes
   with_items:
-    - python3.8
+    - "{{ python_packages }}"
     - postgresql12
   when: not amazon_extras_repo.stat.exists or amzn2extras is failed
 
diff --git a/tasks/install.debian.yml b/tasks/install.debian.yml
index e2f2637..b1e4557 100644
--- a/tasks/install.debian.yml
+++ b/tasks/install.debian.yml
@@ -10,10 +10,6 @@
     state: present
   loop:
     - git
-    - python3.8
-    - python3-pip
-    - python3.8-venv
-    - python3.8-dev
     - build-essential
     - libxml2-dev
     - libxslt1-dev
@@ -22,6 +18,11 @@
     - libssl-dev
     - zlib1g-dev
 
+- name: install.debian | install required python packages
+  ansible.builtin.apt:
+    name: "{{ python_packages }}"
+    state: present
+
 - name: install.debian | install Git
   ansible.builtin.apt:
     name: git
diff --git a/tasks/install.redhat.yml b/tasks/install.redhat.yml
index 3eea52c..0d93625 100644
--- a/tasks/install.redhat.yml
+++ b/tasks/install.redhat.yml
@@ -10,9 +10,6 @@
   loop:
     - gcc
     - git
-    - python38
-    - python38-devel
-    - python3-pip
     - libxml2-devel
     - libxslt-devel
     - libffi-devel
@@ -20,6 +17,11 @@
     - openssl-devel
     - redhat-rpm-config
 
+- name: install.redhat | install required python packages
+  ansible.builtin.yum:
+    name: "{{ python_packages }}"
+    state: present
+
 - name: install.redhat | install Git
   ansible.builtin.yum:
     name: git
diff --git a/tasks/main.yml b/tasks/main.yml
index c893f50..f52bd98 100644
--- a/tasks/main.yml
+++ b/tasks/main.yml
@@ -1,4 +1,7 @@
 ---
+# Variable configuration.
+- include_tasks: variables.yml
+
 - name: Include system packages
   include_tasks: "install.{{ ansible_os_family | lower }}.yml"
   args:
diff --git a/tasks/superusers.yml b/tasks/superusers.yml
index 5af2d13..399d4aa 100644
--- a/tasks/superusers.yml
+++ b/tasks/superusers.yml
@@ -20,5 +20,6 @@
     label: "{{ item.username }}"
   changed_when: '"Superuser created successfully." in result.stdout'
   failed_when: >
+    (result.rc != 0) and
     (result.stderr != '') and
     ("CommandError: Error: That username is already taken." not in result.stderr)
diff --git a/tasks/upgrade.yml b/tasks/upgrade.yml
index 33ab116..059f11b 100644
--- a/tasks/upgrade.yml
+++ b/tasks/upgrade.yml
@@ -2,7 +2,7 @@
 - name: upgrade | run the upgrade script
   ansible.builtin.command: "{{ netbox_current_path }}/upgrade.sh"
   environment:
-    PYTHON: python3.8
+    PYTHON: "python{{ python_version | default(__python_version) }}"
   become: yes
   become_method: sudo
   become_user: "{{ netbox_user }}"
diff --git a/tasks/variables.yml b/tasks/variables.yml
new file mode 100644
index 0000000..341374d
--- /dev/null
+++ b/tasks/variables.yml
@@ -0,0 +1,25 @@
+---
+# Variable configuration.
+- name: Include OS-specific variables (Debian).
+  ansible.builtin.include_vars: "{{ ansible_distribution }}-{{ ansible_distribution_version.split('.')[0] }}.yml"
+  when: ansible_os_family == 'Debian'
+
+- name: Include OS-specific variables (RedHat).
+  ansible.builtin.include_vars: "{{ ansible_os_family }}-{{ ansible_distribution_version.split('.')[0] }}.yml"
+  when:
+  - ansible_os_family == 'RedHat'
+  - ansible_distribution != 'Amazon'
+
+- name: Include OS-specific variables (Amazon).
+  ansible.builtin.include_vars: "{{ ansible_distribution }}-{{ ansible_distribution_major_version }}.yml"
+  when: ansible_distribution == 'Amazon'
+
+- name: Define python_packages.
+  ansible.builtin.set_fact:
+    python_packages: "{{ __python_packages | list }}"
+  when: python_packages is not defined
+
+- name: Define python_version.
+  ansible.builtin.set_fact:
+    python_version: "{{ __python_version }}"
+  when: python_version is not defined
diff --git a/vars/Amazon-2.yml b/vars/Amazon-2.yml
new file mode 100644
index 0000000..491d149
--- /dev/null
+++ b/vars/Amazon-2.yml
@@ -0,0 +1,4 @@
+---
+__python_version: "3.8"
+__python_packages:
+  - "python{{ python_version | default(__python_version) }}"
diff --git a/vars/Debian-10.yml b/vars/Debian-10.yml
new file mode 100644
index 0000000..50e6208
--- /dev/null
+++ b/vars/Debian-10.yml
@@ -0,0 +1,10 @@
+---
+__python_version: "3.7"
+# this is the last supported available version of python on debian 10.
+__python_packages:
+    - "python{{ python_version | default(__python_version) }}"
+    - "python3-pip"
+    - "python{{ python_version | default(__python_version) }}-venv"
+    - "python{{ python_version | default(__python_version) }}-dev"
+netbox_version_tag: v3.1.11
+# this is the last supported version of netbox on debian 10.
diff --git a/vars/Debian-11.yml b/vars/Debian-11.yml
new file mode 100644
index 0000000..d525a91
--- /dev/null
+++ b/vars/Debian-11.yml
@@ -0,0 +1,7 @@
+---
+__python_version: "3.9"
+__python_packages:
+    - "python{{ python_version | default(__python_version) }}"
+    - "python3-pip"
+    - "python{{ python_version | default(__python_version) }}-venv"
+    - "python{{ python_version | default(__python_version) }}-dev"
diff --git a/vars/RedHat-8.yml b/vars/RedHat-8.yml
new file mode 100644
index 0000000..6412db8
--- /dev/null
+++ b/vars/RedHat-8.yml
@@ -0,0 +1,6 @@
+---
+__python_version: "3.8"
+__python_packages:
+    - "python{{ python_version | default(__python_version) | replace('.','') }}"
+    - "python{{ python_version | default(__python_version) | replace('.','') }}-devel"
+    - "python3-pip"
diff --git a/vars/Ubuntu-20.yml b/vars/Ubuntu-20.yml
new file mode 100644
index 0000000..a9ba9d9
--- /dev/null
+++ b/vars/Ubuntu-20.yml
@@ -0,0 +1,7 @@
+---
+__python_version: "3.8"
+__python_packages:
+    - "python{{ python_version | default(__python_version) }}"
+    - "python3-pip"
+    - "python{{ python_version | default(__python_version) }}-venv"
+    - "python{{ python_version | default(__python_version) }}-dev"