diff --git a/swh/lister/gitlab/lister.py b/swh/lister/gitlab/lister.py
--- a/swh/lister/gitlab/lister.py
+++ b/swh/lister/gitlab/lister.py
@@ -9,6 +9,7 @@
 from typing import Any, Dict, Iterator, Optional, Tuple
 from urllib.parse import parse_qs, urlparse
 
+import iso8601
 import requests
 from requests.exceptions import HTTPError
 from requests.status_codes import codes
@@ -174,8 +175,7 @@
                 lister_id=self.lister_obj.id,
                 url=repo["http_url_to_repo"],
                 visit_type="git",
-                # TODO: Support "last_activity_at" as update information
-                # last_update=repo["last_activity_at"],
+                last_update=iso8601.parse_date(repo["last_activity_at"]),
             )
 
     def commit_page(self, page_result: PageResult) -> None:
diff --git a/swh/lister/gitlab/tests/test_lister.py b/swh/lister/gitlab/tests/test_lister.py
--- a/swh/lister/gitlab/tests/test_lister.py
+++ b/swh/lister/gitlab/tests/test_lister.py
@@ -53,6 +53,7 @@
     for listed_origin in scheduler_origins:
         assert listed_origin.visit_type == "git"
         assert listed_origin.url.startswith(f"https://{instance}")
+        assert listed_origin.last_update is not None
 
 
 def gitlab_page_response(datadir, instance: str, page_id: int) -> List[Dict]:
@@ -94,6 +95,7 @@
     for listed_origin in scheduler_origins:
         assert listed_origin.visit_type == "git"
         assert listed_origin.url.startswith(f"https://{instance}")
+        assert listed_origin.last_update is not None
 
 
 def test_lister_gitlab_incremental(swh_scheduler, requests_mock, datadir):
@@ -155,6 +157,7 @@
     for listed_origin in scheduler_origins:
         assert listed_origin.visit_type == "git"
         assert listed_origin.url.startswith(f"https://{instance}")
+        assert listed_origin.last_update is not None
 
 
 def test_lister_gitlab_rate_limit(swh_scheduler, requests_mock, datadir, mocker):