diff --git a/addons/website_forum/controllers/website_forum.py b/addons/website_forum/controllers/website_forum.py
index 2b377bc0516..db3a448e640 100644
--- a/addons/website_forum/controllers/website_forum.py
+++ b/addons/website_forum/controllers/website_forum.py
@@ -283,8 +283,19 @@ class WebsiteForum(WebsiteProfile):
         # Compatibility pre-v14
         return request.redirect(_build_url_w_params("/forum/%s/%s" % (slug(forum), slug(question)), request.params), code=301)
 
-    @http.route(['''/forum/<model("forum.forum"):forum>/<model("forum.post", "[('forum_id','=',forum.id),('parent_id','=',False),('can_view', '=', True)]"):question>'''],
-                type='http', auth="public", website=True, sitemap=True)
+    def sitemap_forum_post(env, rule, qs):
+        ForumPost = env['forum.post']
+        dom = expression.AND([
+            env['website'].get_current_website().website_domain(),
+            [('parent_id', '=', False), ('can_view', '=', True)],
+        ])
+        for forum_post in ForumPost.search(dom):
+            loc = '/forum/%s/%s' % (slug(forum_post.forum_id), slug(forum_post))
+            if not qs or qs.lower() in loc:
+                yield {'loc': loc, 'lastmod': forum_post.write_date.date()}
+
+    @http.route(['''/forum/<model("forum.forum"):forum>/<model("forum.post"):question>'''],
+                type='http', auth="public", website=True, sitemap=sitemap_forum_post)
     def question(self, forum, question, **post):
         if not forum.active:
             return request.render("website_forum.header", {'forum': forum})
diff --git a/addons/website_forum/tests/__init__.py b/addons/website_forum/tests/__init__.py
index eb576b9e6b9..fe2713a308a 100644
--- a/addons/website_forum/tests/__init__.py
+++ b/addons/website_forum/tests/__init__.py
@@ -6,4 +6,5 @@ from . import test_forum_internals
 from . import test_forum_karma_access
 from . import test_forum_tag
 from . import test_forum_tours
+from . import test_sitemap
 from . import test_web_editor
diff --git a/addons/website_forum/tests/test_sitemap.py b/addons/website_forum/tests/test_sitemap.py
new file mode 100644
index 00000000000..1d003e0b6bc
--- /dev/null
+++ b/addons/website_forum/tests/test_sitemap.py
@@ -0,0 +1,31 @@
+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+
+from freezegun import freeze_time
+from unittest.mock import patch
+
+from odoo.addons.website_forum.tests.common import TestForumCommon
+from odoo.tests import tagged
+
+
+@tagged('post_install', '-at_install')
+class TestWebsiteControllers(TestForumCommon):
+
+    def test_01_forum_sitemap(self):
+        website = self.env['website'].browse(1)
+
+        # Simulate post from 2023-05-31
+        datetime = '2023-05-31'
+        with freeze_time(datetime), patch.object(self.env.cr, 'now', lambda: datetime):
+            self.post.name = "RenameIt"  # update write_date
+            self.post._update_last_activity()  # update last_activity_date
+
+        locs = website._enumerate_pages(query_string='/forum/%s' % self.forum.name)
+        self.assertEqual(list(locs)[1]['lastmod'].strftime("%Y-%m-%d"), datetime)
+
+        # Edit post content the 2024-01-01
+        datetime = '2024-01-01'
+        with freeze_time(datetime), patch.object(self.env.cr, 'now', lambda: datetime):
+            self.post.content = "I am a bird"  # update write_date
+
+        locs = website._enumerate_pages(query_string='/forum/%s' % self.forum.name)
+        self.assertEqual(list(locs)[1]['lastmod'].strftime("%Y-%m-%d"), datetime)