diff --git a/app/scodoc/sco_dept.py b/app/scodoc/sco_dept.py
index 274b41d763..c8dcc91425 100644
--- a/app/scodoc/sco_dept.py
+++ b/app/scodoc/sco_dept.py
@@ -56,7 +56,7 @@ def index_html(showcodes=0, showsemtable=0):
     H.append(sco_news.scolar_news_summary_html())
 
     # Avertissement de mise à jour:
-    H.append(sco_up_to_date.html_up_to_date_box())
+    H.append("""<div id="update_warning"></div>""")
 
     # Liste de toutes les sessions:
     sems = sco_formsemestre.do_formsemestre_list()
diff --git a/app/scodoc/sco_up_to_date.py b/app/scodoc/sco_up_to_date.py
index 02c35c77d4..152b05691f 100644
--- a/app/scodoc/sco_up_to_date.py
+++ b/app/scodoc/sco_up_to_date.py
@@ -28,30 +28,61 @@
 
 """ Verification version logiciel vs version "stable" sur serveur
     N'effectue pas la mise à jour automatiquement, mais permet un affichage d'avertissement.
-
-    Désactivé temporairement pour ScoDoc 9.
 """
-
+import json
+import requests
+import time
 from flask import current_app
+import app.scodoc.sco_utils as scu
+from sco_version import SCOVERSION, SCONAME
 
 
-def is_up_to_date():
-    """True if up_to_date
-    Returns status, message
+def is_up_to_date() -> str:
+    """Check installed version vs last release.
+    Returns html message, empty of ok.
     """
-    current_app.logger.debug("Warning: is_up_to_date not implemented for ScoDoc9")
-    return True, "unimplemented"
+    diag = ""
+    try:
+        response = requests.get(scu.SCO_UP2DATE)
+    except requests.exceptions.ConnectionError:
+        current_app.logger.debug("is_up_to_date: %s", diag)
+        return f"""<div>Attention: installation de {SCONAME} non fonctionnelle.</div>
+        <div>Détails: pas de connexion à {scu.SCO_WEBSITE}.
+        Vérifier paramètrages réseau, 
+        <a href="https://scodoc.org/GuideInstallDebian11/#informations-sur-les-flux-reseau">voir la documentation</a>.
+        </div>
+        """
+    except:
+        current_app.logger.debug("is_up_to_date: %s", diag)
+        return f"""<div>Attention: installation de {SCONAME} non fonctionnelle.</div>
+        <div>Détails: erreur inconnue lors de la connexion à {scu.SCO_WEBSITE}.
+        Vérifier paramètrages réseau, 
+        <a href="https://scodoc.org/GuideInstallDebian11/#informations-sur-les-flux-reseau">voir la documentation</a>.
+        </div>
+        """
 
+    if response.status_code != 200:
+        current_app.logger.debug(
+            f"is_up_to_date: invalid response code ({response.status_code})"
+        )
+        return f"""<div>Attention: réponse invalide de {scu.SCO_WEBSITE}</div>
+        <div>(erreur http {response.status_code}).</div>"""
 
-def html_up_to_date_box():
-    """"""
-    status, msg = is_up_to_date()
-    if status:
-        return ""
-    return (
-        """<div class="update_warning">
-    <span>Attention: cette installation de ScoDoc n'est pas à jour.</span>
-    <div class="update_warning_sub">Contactez votre administrateur. %s</div>
-    </div>"""
-        % msg
-    )
+    try:
+        infos = json.loads(response.text)
+    except json.decoder.JSONDecodeError:
+        current_app.logger.debug(f"is_up_to_date: invalid response (json)")
+        return f"""<div>Attention: réponse invalide de {scu.SCO_WEBSITE}</div>
+        <div>(erreur json).</div>"""
+
+    # nb: si de nouveaux paquets sont publiés chaque jour, le décalage ne sera jamais signalé.
+    # mais en régime "normal", on aura une alerte après 24h sans mise à jour.
+    days_since_last_package = (time.time() - infos["publication_time"]) / (24 * 60 * 60)
+    if (infos["version"] != SCOVERSION) and (days_since_last_package > 1.0):
+        return f"""<div>Attention: {SCONAME} version ({SCOVERSION}) non à jour
+            ({infos["version"]} disponible).</div>
+            <div>Contacter votre administrateur système
+            (<a href="https://scodoc.org/MisesAJour/">documentation</a>).
+            </div>
+        """
+    return ""  # ok
diff --git a/app/scodoc/sco_utils.py b/app/scodoc/sco_utils.py
index 7c62ca7c45..03e02cbf6a 100644
--- a/app/scodoc/sco_utils.py
+++ b/app/scodoc/sco_utils.py
@@ -361,7 +361,7 @@ SCO_DEV_MAIL = "emmanuel.viennet@gmail.com"  # SVP ne pas changer
 # Adresse pour l'envoi des dumps (pour assistance technnique):
 #   ne pas changer (ou vous perdez le support)
 SCO_DUMP_UP_URL = "https://scodoc.org/scodoc-installmgr/upload-dump"
-
+SCO_UP2DATE = "https://scodoc.org/scodoc-installmgr/last_stable_version"
 CSV_FIELDSEP = ";"
 CSV_LINESEP = "\n"
 CSV_MIMETYPE = "text/comma-separated-values"
diff --git a/app/static/css/scodoc.css b/app/static/css/scodoc.css
index 61d2e2ecd8..d8a7249c4b 100644
--- a/app/static/css/scodoc.css
+++ b/app/static/css/scodoc.css
@@ -2883,7 +2883,8 @@ div.othersemlist input {
 }
 
 
-div.update_warning {
+div#update_warning {
+    /* display: none; */
     border: 1px solid red;
     background-color: rgb(250,220,220);
     margin: 3ex;
@@ -2891,11 +2892,11 @@ div.update_warning {
     padding-right: 1ex;
     padding-bottom: 1ex;
 }
-div.update_warning span:before {
+div#update_warning > div:first-child:before {
     content: url(/ScoDoc/static/icons/warning_img.png);
     vertical-align: -80%;  
 }
-div.update_warning_sub {
+div#update_warning > div:nth-child(2) {
     font-size: 80%;
     padding-left: 8ex;
 }
diff --git a/app/static/js/scodoc.js b/app/static/js/scodoc.js
index c4def3d6de..b1c15017e7 100644
--- a/app/static/js/scodoc.js
+++ b/app/static/js/scodoc.js
@@ -53,6 +53,13 @@ $(function () {
     );
     $(".sco_dropdown_menu > li > a > span").switchClass("ui-icon-carat-1-e", "ui-icon-carat-1-s");
 
+    /* up-to-date status */
+    var update_div = document.getElementById("update_warning");
+    if (update_div) {
+        fetch('install_info').then(
+            response => response.text()
+        ).then(text => update_div.innerHTML = text);
+    }
 });
 
 
diff --git a/app/views/scodoc.py b/app/views/scodoc.py
index 3dc07fea09..70c58cede0 100644
--- a/app/views/scodoc.py
+++ b/app/views/scodoc.py
@@ -54,6 +54,11 @@ from werkzeug.exceptions import BadRequest, NotFound
 
 from app import db
 from app.auth.models import User
+from app.decorators import (
+    admin_required,
+    scodoc7func,
+    scodoc,
+)
 from app.forms.main import config_logos, config_main
 from app.forms.main.create_dept import CreateDeptForm
 from app.forms.main.config_apo import CodesDecisionsForm
@@ -63,14 +68,11 @@ from app.models import departements
 from app.models import FormSemestre, FormSemestreInscription
 from app.models import ScoDocSiteConfig
 from app.models import UniteEns
-from app.scodoc import sco_codes_parcours, sco_logos
+
 from app.scodoc import sco_find_etud
+from app.scodoc import sco_logos
 from app.scodoc import sco_utils as scu
-from app.decorators import (
-    admin_required,
-    scodoc7func,
-    scodoc,
-)
+
 from app.scodoc.sco_exceptions import AccessDenied
 from app.scodoc.sco_permissions import Permission
 from app.views import scodoc_bp as bp
diff --git a/app/views/scolar.py b/app/views/scolar.py
index 48efb23bb0..67cb7b7b60 100644
--- a/app/views/scolar.py
+++ b/app/views/scolar.py
@@ -65,23 +65,18 @@ from app.scodoc.sco_exceptions import (
     ScoValueError,
 )
 from app.scodoc.TrivialFormulator import TrivialFormulator, tf_error_message
-import app
 from app.scodoc.gen_tables import GenTable
 from app.scodoc import html_sco_header
 from app.scodoc import sco_import_etuds
-from app.scodoc import sco_abs
 from app.scodoc import sco_archives_etud
 from app.scodoc import sco_codes_parcours
 from app.scodoc import sco_cache
 from app.scodoc import sco_debouche
 from app.scodoc import sco_dept
 from app.scodoc import sco_dump_db
-from app.scodoc import sco_edt_cal
-from app.scodoc import sco_excel
+from app.scodoc import sco_etud
 from app.scodoc import sco_find_etud
-from app.scodoc import sco_formations
 from app.scodoc import sco_formsemestre
-from app.scodoc import sco_formsemestre_edit
 from app.scodoc import sco_formsemestre_inscriptions
 from app.scodoc import sco_groups
 from app.scodoc import sco_groups_edit
@@ -92,12 +87,10 @@ from app.scodoc import sco_permissions_check
 from app.scodoc import sco_photos
 from app.scodoc import sco_portal_apogee
 from app.scodoc import sco_preferences
-from app.scodoc import sco_report
 from app.scodoc import sco_synchro_etuds
 from app.scodoc import sco_trombino
 from app.scodoc import sco_trombino_tours
 from app.scodoc import sco_up_to_date
-from app.scodoc import sco_etud
 
 
 def sco_publish(route, function, permission, methods=["GET"]):
@@ -338,6 +331,14 @@ def index_html(showcodes=0, showsemtable=0):
     return sco_dept.index_html(showcodes=showcodes, showsemtable=showsemtable)
 
 
+@bp.route("/install_info")
+@scodoc
+@permission_required(Permission.ScoView)
+def install_info():
+    """Information on install status (html str)"""
+    return sco_up_to_date.is_up_to_date()
+
+
 sco_publish(
     "/trombino", sco_trombino.trombino, Permission.ScoView, methods=["GET", "POST"]
 )
diff --git a/sco_version.py b/sco_version.py
index e962db1f0c..0cedeb3dc2 100644
--- a/sco_version.py
+++ b/sco_version.py
@@ -1,7 +1,7 @@
 # -*- mode: python -*-
 # -*- coding: utf-8 -*-
 
-SCOVERSION = "9.1.81"
+SCOVERSION = "9.1.82"
 
 SCONAME = "ScoDoc"