diff --git a/l10n_it_fatturapa_import_zip/tests/data/xml_import.zip b/l10n_it_fatturapa_import_zip/tests/data/xml_import.zip
index 31e589cab602..f9ef1e297466 100644
Binary files a/l10n_it_fatturapa_import_zip/tests/data/xml_import.zip and b/l10n_it_fatturapa_import_zip/tests/data/xml_import.zip differ
diff --git a/l10n_it_fatturapa_in/tests/data/IT05979361218_003.xml b/l10n_it_fatturapa_in/tests/data/IT05979361218_003.xml
index 240035ebebbe..96f7597d5ef9 100644
--- a/l10n_it_fatturapa_in/tests/data/IT05979361218_003.xml
+++ b/l10n_it_fatturapa_in/tests/data/IT05979361218_003.xml
@@ -53,7 +53,7 @@ xsi:schemaLocation="http://ivaservizi.agenziaentrate.gov.it/docs/xsd/fatture/v1.
                     <IdPaese>IT</IdPaese>
                     <IdCodice>03533590174</IdCodice>
                 </IdFiscaleIVA>
-                <CodiceFiscale>MRORSS90E25B111T</CodiceFiscale>
+                <CodiceFiscale>RSSMRA90B25B111S</CodiceFiscale>
                 <Anagrafica>
                     <Nome>MARIO</Nome>
                     <Cognome>ROSSI</Cognome>
diff --git a/l10n_it_fiscalcode/README.rst b/l10n_it_fiscalcode/README.rst
index 2ef4aafd11ec..36c111bb3496 100644
--- a/l10n_it_fiscalcode/README.rst
+++ b/l10n_it_fiscalcode/README.rst
@@ -1,3 +1,7 @@
+.. image:: https://odoo-community.org/readme-banner-image
+   :target: https://odoo-community.org/get-involved?utm_source=readme
+   :alt: Odoo Community Association
+
 ====================
 ITA - Codice fiscale
 ====================
@@ -13,7 +17,7 @@ ITA - Codice fiscale
 .. |badge1| image:: https://img.shields.io/badge/maturity-Production%2FStable-green.png
     :target: https://odoo-community.org/page/development-status
     :alt: Production/Stable
-.. |badge2| image:: https://img.shields.io/badge/licence-AGPL--3-blue.png
+.. |badge2| image:: https://img.shields.io/badge/license-AGPL--3-blue.png
     :target: http://www.gnu.org/licenses/agpl-3.0-standalone.html
     :alt: License: AGPL-3
 .. |badge3| image:: https://img.shields.io/badge/github-OCA%2Fl10n--italy-lightgray.png?logo=github
@@ -46,11 +50,13 @@ Installation
 
 **Italiano**
 
-Installare il modulo Python: `codicefiscale <https://pypi.python.org/pypi/codicefiscale>`__.
+Installare i moduli Python: `codicefiscale <https://pypi.python.org/pypi/codicefiscale>`__
+e `python-stdnum <https://pypi.org/project/python-stdnum>`__.
 
 **English**
 
-Install the Python package: `codicefiscale <https://pypi.python.org/pypi/codicefiscale>`__.
+Install the Python packages: `codicefiscale <https://pypi.python.org/pypi/codicefiscale>`__
+and `python-stdnum <https://pypi.org/project/python-stdnum>`__.
 
 Usage
 =====
@@ -105,6 +111,8 @@ Contributors
   * Simone Rubino <simone.rubino@aion-tech.it>
 * Ooops404 <https://www.ooops404.com>
   * Eduard Brahas <eduardbrhas@outlook.it>
+* Phi srl <https://www.phi.technology>
+  * Marco Colombo <marco.colombo@phi.technology>
 
 Maintainers
 ~~~~~~~~~~~
diff --git a/l10n_it_fiscalcode/__manifest__.py b/l10n_it_fiscalcode/__manifest__.py
index 0545530547c3..d3b3bf5cf1e9 100644
--- a/l10n_it_fiscalcode/__manifest__.py
+++ b/l10n_it_fiscalcode/__manifest__.py
@@ -17,7 +17,7 @@
     "license": "AGPL-3",
     "depends": ["base_vat"],
     "external_dependencies": {
-        "python": ["codicefiscale"],
+        "python": ["codicefiscale", "python-stdnum"],
     },
     "data": [
         "security/ir.model.access.csv",
diff --git a/l10n_it_fiscalcode/model/res_partner.py b/l10n_it_fiscalcode/model/res_partner.py
index a23bd557b57f..8e81112e4551 100644
--- a/l10n_it_fiscalcode/model/res_partner.py
+++ b/l10n_it_fiscalcode/model/res_partner.py
@@ -1,7 +1,7 @@
 # Copyright 2024 Simone Rubino - Aion Tech
 # License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl).
 
-from codicefiscale import isvalid
+from stdnum.it.codicefiscale import is_valid
 
 from odoo import _, api, fields, models
 from odoo.exceptions import ValidationError
@@ -30,7 +30,7 @@ def check_fiscalcode(self):
                     # Check fiscalcode length of a person
                     msg = _("The fiscal code must have 16 characters.")
                     raise ValidationError(msg)
-                if not isvalid(partner.fiscalcode):
+                if not is_valid(partner.fiscalcode):
                     # Check fiscalcode validity
                     msg = _("The fiscal code isn't valid.")
                     raise ValidationError(msg)
diff --git a/l10n_it_fiscalcode/readme/CONTRIBUTORS.rst b/l10n_it_fiscalcode/readme/CONTRIBUTORS.rst
index 12108dea8fe1..3c77221ef387 100644
--- a/l10n_it_fiscalcode/readme/CONTRIBUTORS.rst
+++ b/l10n_it_fiscalcode/readme/CONTRIBUTORS.rst
@@ -16,3 +16,5 @@
   * Simone Rubino <simone.rubino@aion-tech.it>
 * Ooops404 <https://www.ooops404.com>
   * Eduard Brahas <eduardbrhas@outlook.it>
+* Phi srl <https://www.phi.technology>
+  * Marco Colombo <marco.colombo@phi.technology>
diff --git a/l10n_it_fiscalcode/readme/INSTALL.rst b/l10n_it_fiscalcode/readme/INSTALL.rst
index ab2386fa274e..2d2247c9449a 100644
--- a/l10n_it_fiscalcode/readme/INSTALL.rst
+++ b/l10n_it_fiscalcode/readme/INSTALL.rst
@@ -1,7 +1,9 @@
 **Italiano**
 
-Installare il modulo Python: `codicefiscale <https://pypi.python.org/pypi/codicefiscale>`__.
+Installare i moduli Python: `codicefiscale <https://pypi.python.org/pypi/codicefiscale>`__
+e `python-stdnum <https://pypi.org/project/python-stdnum>`__.
 
 **English**
 
-Install the Python package: `codicefiscale <https://pypi.python.org/pypi/codicefiscale>`__.
+Install the Python packages: `codicefiscale <https://pypi.python.org/pypi/codicefiscale>`__
+and `python-stdnum <https://pypi.org/project/python-stdnum>`__.
diff --git a/l10n_it_fiscalcode/static/description/index.html b/l10n_it_fiscalcode/static/description/index.html
index 5267edda8277..716fbb381f64 100644
--- a/l10n_it_fiscalcode/static/description/index.html
+++ b/l10n_it_fiscalcode/static/description/index.html
@@ -3,15 +3,16 @@
 <head>
 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
 <meta name="generator" content="Docutils: https://docutils.sourceforge.io/" />
-<title>ITA - Codice fiscale</title>
+<title>README.rst</title>
 <style type="text/css">
 
 /*
 :Author: David Goodger (goodger@python.org)
-:Id: $Id: html4css1.css 8954 2022-01-20 10:10:25Z milde $
+:Id: $Id: html4css1.css 9511 2024-01-13 09:50:07Z milde $
 :Copyright: This stylesheet has been placed in the public domain.
 
 Default cascading style sheet for the HTML output of Docutils.
+Despite the name, some widely supported CSS2 features are used.
 
 See https://docutils.sourceforge.io/docs/howto/html-stylesheets.html for how to
 customize this style sheet.
@@ -274,7 +275,7 @@
   margin-left: 2em ;
   margin-right: 2em }
 
-pre.code .ln { color: grey; } /* line numbers */
+pre.code .ln { color: gray; } /* line numbers */
 pre.code, code { background-color: #eeeeee }
 pre.code .comment, code .comment { color: #5C6576 }
 pre.code .keyword, code .keyword { color: #3B0D06; font-weight: bold }
@@ -300,7 +301,7 @@
 span.pre {
   white-space: pre }
 
-span.problematic {
+span.problematic, pre.problematic {
   color: red }
 
 span.section-subtitle {
@@ -359,16 +360,21 @@
 </style>
 </head>
 <body>
-<div class="document" id="ita-codice-fiscale">
-<h1 class="title">ITA - Codice fiscale</h1>
+<div class="document">
 
+
+<a class="reference external image-reference" href="https://odoo-community.org/get-involved?utm_source=readme">
+<img alt="Odoo Community Association" src="https://odoo-community.org/readme-banner-image" />
+</a>
+<div class="section" id="ita-codice-fiscale">
+<h1>ITA - Codice fiscale</h1>
 <!-- !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
 !! This file is generated by oca-gen-addon-readme !!
 !! changes will be overwritten.                   !!
 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
 !! source digest: sha256:0aa1bac82b773740f26746eb096cf6cb40a54ecb65e3c3db3764a2826861aa05
 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! -->
-<p><a class="reference external image-reference" href="https://odoo-community.org/page/development-status"><img alt="Production/Stable" src="https://img.shields.io/badge/maturity-Production%2FStable-green.png" /></a> <a class="reference external image-reference" href="http://www.gnu.org/licenses/agpl-3.0-standalone.html"><img alt="License: AGPL-3" src="https://img.shields.io/badge/licence-AGPL--3-blue.png" /></a> <a class="reference external image-reference" href="https://github.com/OCA/l10n-italy/tree/14.0/l10n_it_fiscalcode"><img alt="OCA/l10n-italy" src="https://img.shields.io/badge/github-OCA%2Fl10n--italy-lightgray.png?logo=github" /></a> <a class="reference external image-reference" href="https://translation.odoo-community.org/projects/l10n-italy-14-0/l10n-italy-14-0-l10n_it_fiscalcode"><img alt="Translate me on Weblate" src="https://img.shields.io/badge/weblate-Translate%20me-F47D42.png" /></a> <a class="reference external image-reference" href="https://runboat.odoo-community.org/builds?repo=OCA/l10n-italy&amp;target_branch=14.0"><img alt="Try me on Runboat" src="https://img.shields.io/badge/runboat-Try%20me-875A7B.png" /></a></p>
+<p><a class="reference external image-reference" href="https://odoo-community.org/page/development-status"><img alt="Production/Stable" src="https://img.shields.io/badge/maturity-Production%2FStable-green.png" /></a> <a class="reference external image-reference" href="http://www.gnu.org/licenses/agpl-3.0-standalone.html"><img alt="License: AGPL-3" src="https://img.shields.io/badge/license-AGPL--3-blue.png" /></a> <a class="reference external image-reference" href="https://github.com/OCA/l10n-italy/tree/14.0/l10n_it_fiscalcode"><img alt="OCA/l10n-italy" src="https://img.shields.io/badge/github-OCA%2Fl10n--italy-lightgray.png?logo=github" /></a> <a class="reference external image-reference" href="https://translation.odoo-community.org/projects/l10n-italy-14-0/l10n-italy-14-0-l10n_it_fiscalcode"><img alt="Translate me on Weblate" src="https://img.shields.io/badge/weblate-Translate%20me-F47D42.png" /></a> <a class="reference external image-reference" href="https://runboat.odoo-community.org/builds?repo=OCA/l10n-italy&amp;target_branch=14.0"><img alt="Try me on Runboat" src="https://img.shields.io/badge/runboat-Try%20me-875A7B.png" /></a></p>
 <p><strong>Italiano</strong></p>
 <p>Questo modulo aggiunge al partner il campo codice fiscale e permette di calcolarne il suo valore.</p>
 <p><strong>English</strong></p>
@@ -388,14 +394,16 @@ <h1 class="title">ITA - Codice fiscale</h1>
 </ul>
 </div>
 <div class="section" id="installation">
-<h1><a class="toc-backref" href="#toc-entry-1">Installation</a></h1>
+<h2><a class="toc-backref" href="#toc-entry-1">Installation</a></h2>
 <p><strong>Italiano</strong></p>
-<p>Installare il modulo Python: <a class="reference external" href="https://pypi.python.org/pypi/codicefiscale">codicefiscale</a>.</p>
+<p>Installare i moduli Python: <a class="reference external" href="https://pypi.python.org/pypi/codicefiscale">codicefiscale</a>
+e <a class="reference external" href="https://pypi.org/project/python-stdnum">python-stdnum</a>.</p>
 <p><strong>English</strong></p>
-<p>Install the Python package: <a class="reference external" href="https://pypi.python.org/pypi/codicefiscale">codicefiscale</a>.</p>
+<p>Install the Python packages: <a class="reference external" href="https://pypi.python.org/pypi/codicefiscale">codicefiscale</a>
+and <a class="reference external" href="https://pypi.org/project/python-stdnum">python-stdnum</a>.</p>
 </div>
 <div class="section" id="usage">
-<h1><a class="toc-backref" href="#toc-entry-2">Usage</a></h1>
+<h2><a class="toc-backref" href="#toc-entry-2">Usage</a></h2>
 <p><strong>Italiano</strong></p>
 <p>Sulla scheda del partner fare clic sul pulsante <em>Calcola CF</em> per aprire la procedura guidata relativa al calcolo
 del codice fiscale.</p>
@@ -403,7 +411,7 @@ <h1><a class="toc-backref" href="#toc-entry-2">Usage</a></h1>
 <p>Go to Partner and click “Compute FC” in order to open the wizard related to the fiscal code computation.</p>
 </div>
 <div class="section" id="bug-tracker">
-<h1><a class="toc-backref" href="#toc-entry-3">Bug Tracker</a></h1>
+<h2><a class="toc-backref" href="#toc-entry-3">Bug Tracker</a></h2>
 <p>Bugs are tracked on <a class="reference external" href="https://github.com/OCA/l10n-italy/issues">GitHub Issues</a>.
 In case of trouble, please check there if your issue has already been reported.
 If you spotted it first, help us to smash it by providing a detailed and welcomed
@@ -411,9 +419,9 @@ <h1><a class="toc-backref" href="#toc-entry-3">Bug Tracker</a></h1>
 <p>Do not contact contributors directly about support or help with technical issues.</p>
 </div>
 <div class="section" id="credits">
-<h1><a class="toc-backref" href="#toc-entry-4">Credits</a></h1>
+<h2><a class="toc-backref" href="#toc-entry-4">Credits</a></h2>
 <div class="section" id="authors">
-<h2><a class="toc-backref" href="#toc-entry-5">Authors</a></h2>
+<h3><a class="toc-backref" href="#toc-entry-5">Authors</a></h3>
 <ul class="simple">
 <li>Link IT s.r.l.</li>
 <li>Apulia Software</li>
@@ -421,7 +429,7 @@ <h2><a class="toc-backref" href="#toc-entry-5">Authors</a></h2>
 </ul>
 </div>
 <div class="section" id="contributors">
-<h2><a class="toc-backref" href="#toc-entry-6">Contributors</a></h2>
+<h3><a class="toc-backref" href="#toc-entry-6">Contributors</a></h3>
 <ul class="simple">
 <li>Davide Corio</li>
 <li>Luca Subiaco &lt;<a class="reference external" href="mailto:subluca&#64;gmail.com">subluca&#64;gmail.com</a>&gt;</li>
@@ -441,12 +449,16 @@ <h2><a class="toc-backref" href="#toc-entry-6">Contributors</a></h2>
 * Simone Rubino &lt;<a class="reference external" href="mailto:simone.rubino&#64;aion-tech.it">simone.rubino&#64;aion-tech.it</a>&gt;</li>
 <li>Ooops404 &lt;<a class="reference external" href="https://www.ooops404.com">https://www.ooops404.com</a>&gt;
 * Eduard Brahas &lt;<a class="reference external" href="mailto:eduardbrhas&#64;outlook.it">eduardbrhas&#64;outlook.it</a>&gt;</li>
+<li>Phi srl &lt;<a class="reference external" href="https://www.phi.technology">https://www.phi.technology</a>&gt;
+* Marco Colombo &lt;<a class="reference external" href="mailto:marco.colombo&#64;phi.technology">marco.colombo&#64;phi.technology</a>&gt;</li>
 </ul>
 </div>
 <div class="section" id="maintainers">
-<h2><a class="toc-backref" href="#toc-entry-7">Maintainers</a></h2>
+<h3><a class="toc-backref" href="#toc-entry-7">Maintainers</a></h3>
 <p>This module is maintained by the OCA.</p>
-<a class="reference external image-reference" href="https://odoo-community.org"><img alt="Odoo Community Association" src="https://odoo-community.org/logo.png" /></a>
+<a class="reference external image-reference" href="https://odoo-community.org">
+<img alt="Odoo Community Association" src="https://odoo-community.org/logo.png" />
+</a>
 <p>OCA, or the Odoo Community Association, is a nonprofit organization whose
 mission is to support the collaborative development of Odoo features and
 promote its widespread use.</p>
@@ -455,5 +467,6 @@ <h2><a class="toc-backref" href="#toc-entry-7">Maintainers</a></h2>
 </div>
 </div>
 </div>
+</div>
 </body>
 </html>
diff --git a/l10n_it_fiscalcode/tests/test_fiscalcode.py b/l10n_it_fiscalcode/tests/test_fiscalcode.py
index 5e4feb4af068..8e1b0ef93326 100644
--- a/l10n_it_fiscalcode/tests/test_fiscalcode.py
+++ b/l10n_it_fiscalcode/tests/test_fiscalcode.py
@@ -1,7 +1,6 @@
 # Copyright 2024 Simone Rubino - Aion Tech
 # License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl).
 
-from codicefiscale import isvalid
 
 from odoo.exceptions import ValidationError
 from odoo.tests.common import TransactionCase
@@ -34,6 +33,14 @@ def test_fiscalcode_compute(self):
         self.assertEqual(self.partner.fiscalcode, "RSSMRA84H04H501X")
 
     def test_fiscalcode_check(self):
+        # Omocodia
+        self.env["res.partner"].create(
+            {
+                "name": "Person",
+                "is_company": False,
+                "fiscalcode": "RSSMRA70A01Z50QQ",
+            }
+        )
         # Wrong FC length
         with self.assertRaises(ValidationError):
             self.env["res.partner"].create(
@@ -90,8 +97,6 @@ def test_fiscal_code_check_change_to_person(self):
             }
         )
         partner.fiscalcode = wrong_person_fiscalcode
-        # pre-condition
-        self.assertFalse(isvalid(partner.fiscalcode))
 
         # Act
         with self.assertRaises(ValidationError) as ve:
@@ -117,8 +122,6 @@ def test_fiscal_code_check_company_VAT_change_to_person(self):
             }
         )
         partner.fiscalcode = company_vat
-        # pre-condition
-        self.assertFalse(isvalid(partner.fiscalcode))
 
         # Act
         with self.assertRaises(ValidationError) as ve:
diff --git a/requirements.txt b/requirements.txt
index d481b90d3333..53a3079ac24c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,6 +5,7 @@ elementpath
 num2words>=0.5.12
 openupgradelib
 phonenumbers
+python-stdnum
 unidecode
 xlrd
 xlsxwriter