diff --git a/addons/project/controllers/portal.py b/addons/project/controllers/portal.py
index b7e108713d6..98de1ef43ae 100644
--- a/addons/project/controllers/portal.py
+++ b/addons/project/controllers/portal.py
@@ -63,7 +63,7 @@ class ProjectCustomerPortal(CustomerPortal):
         # task count
         task_count = Task.search_count(domain)
         # pager
-        url = "/my/project/%s" % project.id
+        url = "/my/projects/%s" % project.id
         pager = portal_pager(
             url=url,
             url_args={'date_begin': date_begin, 'date_end': date_end, 'sortby': sortby, 'groupby': groupby, 'search_in': search_in, 'search': search},
@@ -146,7 +146,20 @@ class ProjectCustomerPortal(CustomerPortal):
         })
         return request.render("project.portal_my_projects", values)
 
-    @http.route(['/my/project/<int:project_id>'], type='http', auth="public", website=True)
+    @http.route(['/my/project/<int:project_id>',
+                 '/my/project/<int:project_id>/page/<int:page>',
+                 '/my/project/<int:project_id>/task/<int:task_id>',
+                 '/my/project/<int:project_id>/project_sharing'], type='http', auth="public")
+    def portal_project_routes_outdated(self, **kwargs):
+        """ Redirect the outdated routes to the new routes. """
+        return request.redirect(request.httprequest.path.replace('/my/project/', '/my/projects/'))
+
+    @http.route(['/my/task', '/my/task/page/<int:page>'], type='http', auth='public')
+    def portal_my_task_routes_outdated(self, **kwargs):
+        """ Redirect the outdated routes to the new routes. """
+        return request.redirect(request.httprequest.path.replace('/my/task', '/my/tasks'))
+
+    @http.route(['/my/projects/<int:project_id>'], type='http', auth="public", website=True)
     def portal_my_project(self, project_id=None, access_token=None, page=1, date_begin=None, date_end=None, sortby=None, search=None, search_in='content', groupby=None, task_id=None, **kw):
         try:
             project_sudo = self._document_check_access('project.project', project_id, access_token)
@@ -195,7 +208,7 @@ class ProjectCustomerPortal(CustomerPortal):
             session_info['open_task_action'] = task.action_project_sharing_open_task()
         return session_info
 
-    @http.route("/my/project/<int:project_id>/project_sharing", type="http", auth="user", methods=['GET'])
+    @http.route("/my/projects/<int:project_id>/project_sharing", type="http", auth="user", methods=['GET'])
     def render_project_backend_view(self, project_id, task_id=None):
         project = request.env['project.project'].sudo().browse(project_id)
         if not project.exists() or not project.with_user(request.env.user)._check_project_sharing_access():
@@ -206,7 +219,7 @@ class ProjectCustomerPortal(CustomerPortal):
             {'session_info': self._prepare_project_sharing_session_info(project, task)},
         )
 
-    @http.route('/my/project/<int:project_id>/task/<int:task_id>', type='http', auth='public', website=True)
+    @http.route('/my/projects/<int:project_id>/task/<int:task_id>', type='http', auth='public', website=True)
     def portal_my_project_task(self, project_id=None, task_id=None, access_token=None, **kw):
         try:
             project_sudo = self._document_check_access('project.project', project_id, access_token)
@@ -414,7 +427,7 @@ class ProjectCustomerPortal(CustomerPortal):
             'grouped_tasks': grouped_tasks,
             'page_name': 'task',
             'default_url': '/my/tasks',
-            'task_url': 'task',
+            'task_url': 'tasks',
             'pager': pager,
             'searchbar_sortings': searchbar_sortings,
             'searchbar_groupby': searchbar_groupby,
@@ -433,7 +446,7 @@ class ProjectCustomerPortal(CustomerPortal):
         # The route should not be called if at least hr_timesheet is not installed
         raise MissingError(_('There is nothing to report.'))
 
-    @http.route(['/my/task/<int:task_id>'], type='http', auth="public", website=True)
+    @http.route(['/my/tasks/<int:task_id>'], type='http', auth="public", website=True)
     def portal_my_task(self, task_id, report_type=None, access_token=None, **kw):
         try:
             task_sudo = self._document_check_access('project.task', task_id, access_token)
diff --git a/addons/project/models/project.py b/addons/project/models/project.py
index 29b2dbfc3f5..3e2565c0a44 100644
--- a/addons/project/models/project.py
+++ b/addons/project/models/project.py
@@ -364,7 +364,7 @@ class Project(models.Model):
     def _compute_access_url(self):
         super(Project, self)._compute_access_url()
         for project in self:
-            project.access_url = '/my/project/%s' % project.id
+            project.access_url = f'/my/projects/{project.id}'
 
     def _compute_access_warning(self):
         super(Project, self)._compute_access_warning()
@@ -1397,7 +1397,7 @@ class Task(models.Model):
     def _compute_access_url(self):
         super(Task, self)._compute_access_url()
         for task in self:
-            task.access_url = '/my/task/%s' % task.id
+            task.access_url = f'/my/tasks/{task.id}'
 
     def _compute_access_warning(self):
         super(Task, self)._compute_access_warning()
diff --git a/addons/project/views/project_portal_templates.xml b/addons/project/views/project_portal_templates.xml
index 17ea2b8d22b..f2fb8fb2edb 100644
--- a/addons/project/views/project_portal_templates.xml
+++ b/addons/project/views/project_portal_templates.xml
@@ -7,7 +7,7 @@
                 <t t-else="">Projects</t>
             </li>
             <li t-if="page_name == 'project_task' and project" class="breadcrumb-item active">
-                <a t-if="project" t-attf-href="/my/project/{{ project.id }}?{{ keep_query() }}"><t t-esc="project.name"/></a>
+                <a t-if="project" t-attf-href="/my/projects/{{ project.id }}?{{ keep_query() }}"><t t-esc="project.name"/></a>
             </li>
             <li t-elif="project" t-attf-class="breadcrumb-item #{'active ' if not project else ''} text-truncate col-8 col-lg-10">
                 <t t-esc="project.name"/>
@@ -61,7 +61,7 @@
                 <tbody>
                     <tr t-foreach="projects" t-as="project">
                         <td>
-                            <a t-attf-href="/my/project/#{project.id}?{{ keep_query() }}"><span t-field="project.name"/></a>
+                            <a t-attf-href="/my/projects/#{project.id}?{{ keep_query() }}"><span t-field="project.name"/></a>
                         </td>
                         <td class="text-right">
                             <t t-out="project.task_count_with_subtasks" />
@@ -262,7 +262,7 @@
                             </div>
                             <div class="row mb-4">
                                 <div class="col-12 col-md-6">
-                                    <div t-if="project_accessible"><strong>Project:</strong> <a t-attf-href="/my/project/#{task.project_id.id}" t-field="task.project_id"/></div>
+                                    <div t-if="project_accessible"><strong>Project:</strong> <a t-attf-href="/my/projects/#{task.project_id.id}" t-field="task.project_id"/></div>
                                     <div t-else=""><strong>Project:</strong> <a t-field="task.project_id"/></div>
                                     <div t-if="task.date_deadline"><strong>Deadline:</strong> <span t-field="task.date_deadline" t-options='{"widget": "date"}'/></div>
                                     <div name="portal_my_task_planned_hours">
diff --git a/addons/project/views/project_sharing_templates.xml b/addons/project/views/project_sharing_templates.xml
index 3759ba7fcdf..b0958ea5262 100644
--- a/addons/project/views/project_sharing_templates.xml
+++ b/addons/project/views/project_sharing_templates.xml
@@ -9,7 +9,7 @@
     </template>
 
     <template id="project_sharing" name="Project Sharing View">
-        <iframe width="100%" height="100%" frameborder="0" t-attf-src="/my/project/{{ project_id }}{{  '/' + task_id if task_id else '' }}/project_sharing"/>
+        <iframe width="100%" height="100%" frameborder="0" t-attf-src="/my/projects/{{ project_id }}/project_sharing{{  '?task_id=' + task_id if task_id else '' }}"/>
     </template>
 
     <template id="project_sharing_embed" name="Project Sharing View Embed">
diff --git a/odoo/addons/base/models/ir_http.py b/odoo/addons/base/models/ir_http.py
index 05724431263..454e7a33a9d 100644
--- a/odoo/addons/base/models/ir_http.py
+++ b/odoo/addons/base/models/ir_http.py
@@ -322,7 +322,7 @@ class IrHttp(models.AbstractModel):
                     record = record_sudo
                 elif self.env.user.has_group('base.group_portal'):
                     # Check the read access on the record linked to the attachment
-                    # eg: Allow to download an attachment on a task from /my/task/task_id
+                    # eg: Allow to download an attachment on a task from /my/tasks/task_id
                     record.check('read')
                     record = record_sudo