diff --git a/app/scodoc/sco_evaluations.py b/app/scodoc/sco_evaluations.py
index eff9e910..fe91af31 100644
--- a/app/scodoc/sco_evaluations.py
+++ b/app/scodoc/sco_evaluations.py
@@ -1227,7 +1227,7 @@ def evaluation_create_form(
         initvalues["visibulletinlist"] = ["X"]
     else:
         initvalues["visibulletinlist"] = []
-    vals = request.form if request.method == "POST" else request.args
+    vals = (request.form if request.method == "POST" else request.args).copy()
     if vals.get("tf_submitted", False) and "visibulletinlist" not in vals:
         request.form["visibulletinlist"] = []
     #
diff --git a/app/scodoc/sco_formsemestre_edit.py b/app/scodoc/sco_formsemestre_edit.py
index e5d89f4a..5beb17be 100644
--- a/app/scodoc/sco_formsemestre_edit.py
+++ b/app/scodoc/sco_formsemestre_edit.py
@@ -109,7 +109,7 @@ def formsemestre_editwithmodules(formsemestre_id):
             H.append(r)
         else:
             return r  # response redirect
-        vals = request.form if request.method == "POST" else request.args
+        vals = (request.form if request.method == "POST" else request.args).copy()
         if not vals.get("tf_submitted", False):
             H.append(
                 """<p class="help">Seuls les modules cochés font partie de ce semestre. Pour les retirer, les décocher et appuyer sur le bouton "modifier".
@@ -133,7 +133,7 @@ def can_edit_sem(formsemestre_id="", sem=None):
 def do_formsemestre_createwithmodules(edit=False):
     "Form choix modules / responsables et creation formsemestre"
     # Fonction accessible à tous, controle acces à la main:
-    vals = request.form if request.method == "POST" else request.args
+    vals = (request.form if request.method == "POST" else request.args).copy()
     if edit:
         formsemestre_id = int(vals["formsemestre_id"])
         sem = sco_formsemestre.get_formsemestre(formsemestre_id)
@@ -1434,7 +1434,7 @@ def formsemestre_edit_options(formsemestre_id):
     return sco_preferences.SemPreferences(formsemestre_id).edit(categories=["bul"])
 
 
-def formsemestre_change_lock(formsemestre_id, dialog_confirmed=False) -> None:
+def formsemestre_change_lock(formsemestre_id) -> None:
     """Change etat (verrouille si ouvert, déverrouille si fermé)
     nota: etat (1 ouvert, 0 fermé)
     """
@@ -1444,24 +1444,6 @@ def formsemestre_change_lock(formsemestre_id, dialog_confirmed=False) -> None:
     sem = sco_formsemestre.get_formsemestre(formsemestre_id)
     etat = not sem["etat"]
 
-    if not dialog_confirmed:
-        if etat:
-            msg = "déverrouillage"
-        else:
-            msg = "verrouillage"
-        return scu.confirm_dialog(
-            "<h2>Confirmer le %s du semestre ?</h2>" % msg,
-            helpmsg="""Les notes d'un semestre verrouillé ne peuvent plus être modifiées.
-            Un semestre verrouillé peut cependant être déverrouillé facilement à tout moment
-            (par son responsable ou un administrateur).
-            <br/>
-            Le programme d'une formation qui a un semestre verrouillé ne peut plus être modifié.
-            """,
-            dest_url="",
-            cancel_url="formsemestre_status?formsemestre_id=%s" % formsemestre_id,
-            parameters={"formsemestre_id": formsemestre_id},
-        )
-
     args = {"formsemestre_id": formsemestre_id, "etat": etat}
     sco_formsemestre.do_formsemestre_edit(args)
 
diff --git a/app/scodoc/sco_formsemestre_inscriptions.py b/app/scodoc/sco_formsemestre_inscriptions.py
index 5d1df170..90c37d91 100644
--- a/app/scodoc/sco_formsemestre_inscriptions.py
+++ b/app/scodoc/sco_formsemestre_inscriptions.py
@@ -467,7 +467,7 @@ def formsemestre_inscription_option(etudid, formsemestre_id):
         modimpls_by_ue_names[ue_id].append(
             "%s %s" % (mod["module"]["code"], mod["module"]["titre"])
         )
-        vals = request.form if request.method == "POST" else request.args
+        vals = (request.form if request.method == "POST" else request.args).copy()
         if not vals.get("tf_submitted", False):
             # inscrit ?
             for ins in inscr:
diff --git a/app/scodoc/sco_inscr_passage.py b/app/scodoc/sco_inscr_passage.py
index 22624f7b..5adcc593 100644
--- a/app/scodoc/sco_inscr_passage.py
+++ b/app/scodoc/sco_inscr_passage.py
@@ -291,7 +291,6 @@ def formsemestre_inscr_passage(
         etuds = etuds.split(",")  # vient du form de confirmation
     elif isinstance(etuds, int):
         etuds = [etuds]
-
     auth_etuds_by_sem, inscrits, candidats = list_authorized_etuds_by_sem(sem)
     etuds_set = set(etuds)
     candidats_set = set(candidats)
diff --git a/app/scodoc/sco_liste_notes.py b/app/scodoc/sco_liste_notes.py
index 6d6a6111..4a232482 100644
--- a/app/scodoc/sco_liste_notes.py
+++ b/app/scodoc/sco_liste_notes.py
@@ -64,7 +64,7 @@ def do_evaluation_listenotes():
     (si moduleimpl_id, affiche toutes les évaluatons du module)
     """
     mode = None
-    vals = request.form if request.method == "POST" else request.args
+    vals = (request.form if request.method == "POST" else request.args).copy()
     if "evaluation_id" in vals:
         evaluation_id = int(vals["evaluation_id"])
         mode = "eval"
diff --git a/app/scodoc/sco_saisie_notes.py b/app/scodoc/sco_saisie_notes.py
index 8e926b24..07898a62 100644
--- a/app/scodoc/sco_saisie_notes.py
+++ b/app/scodoc/sco_saisie_notes.py
@@ -169,7 +169,7 @@ def do_evaluation_upload_xls():
     Soumission d'un fichier XLS (evaluation_id, notefile)
     """
     authuser = current_user
-    vals = request.form if request.method == "POST" else request.args
+    vals = (request.form if request.method == "POST" else request.args).copy()
     evaluation_id = int(vals["evaluation_id"])
     comment = vals["comment"]
     E = sco_evaluations.do_evaluation_list({"evaluation_id": evaluation_id})[0]
diff --git a/app/scodoc/sco_trombino.py b/app/scodoc/sco_trombino.py
index 747e92f9..a5658b96 100644
--- a/app/scodoc/sco_trombino.py
+++ b/app/scodoc/sco_trombino.py
@@ -514,7 +514,7 @@ def photos_import_files_form(group_ids=[]):
         % groups_infos.groups_query_args,
     ]
     F = html_sco_header.sco_footer()
-    vals = request.form if request.method == "POST" else request.args
+    vals = (request.form if request.method == "POST" else request.args).copy()
     vals["group_ids"] = groups_infos.group_ids
     tf = TrivialFormulator(
         request.base_url,
diff --git a/app/views/entreprises.py b/app/views/entreprises.py
index 6843b518..8a8de35d 100644
--- a/app/views/entreprises.py
+++ b/app/views/entreprises.py
@@ -94,7 +94,7 @@ def sidebar():
     )
 
     # --- entreprise selectionnée:
-    vals = request.form if request.method == "POST" else request.args
+    vals = (request.form if request.method == "POST" else request.args).copy()
     if "entreprise_id" in vals:
         entreprise_id = vals["entreprise_id"]
         E = sco_entreprises.do_entreprise_list(args={"entreprise_id": entreprise_id})
@@ -147,7 +147,7 @@ def index_html(etud_nom=None, limit=50, offset="", format="html"):
         limit = int(limit)
     if offset:
         offset = int(offset or 0)
-    vals = request.form if request.method == "POST" else request.args
+    vals = (request.form if request.method == "POST" else request.args).copy()
     if etud_nom:
         entreprises = sco_entreprises.do_entreprise_list_by_etud(
             args=vals, sort_on_contact=True
diff --git a/app/views/notes.py b/app/views/notes.py
index f827fe05..530877af 100644
--- a/app/views/notes.py
+++ b/app/views/notes.py
@@ -676,9 +676,30 @@ sco_publish(
 @permission_required(Permission.ScoView)  # acces vérifié dans la fonction
 @scodoc7func
 def formsemestre_change_lock(formsemestre_id, dialog_confirmed=False):
-    sco_formsemestre_edit.formsemestre_change_lock(
-        formsemestre_id, dialog_confirmed=dialog_confirmed
-    )
+    "Changement de l'état de verrouillage du semestre"
+
+    if not dialog_confirmed:
+        sem = sco_formsemestre.get_formsemestre(formsemestre_id)
+        etat = not sem["etat"]
+        if etat:
+            msg = "déverrouillage"
+        else:
+            msg = "verrouillage"
+        return scu.confirm_dialog(
+            "<h2>Confirmer le %s du semestre ?</h2>" % msg,
+            helpmsg="""Les notes d'un semestre verrouillé ne peuvent plus être modifiées.
+            Un semestre verrouillé peut cependant être déverrouillé facilement à tout moment
+            (par son responsable ou un administrateur).
+            <br/>
+            Le programme d'une formation qui a un semestre verrouillé ne peut plus être modifié.
+            """,
+            dest_url="",
+            cancel_url="formsemestre_status?formsemestre_id=%s" % formsemestre_id,
+            parameters={"formsemestre_id": formsemestre_id},
+        )
+
+    sco_formsemestre_edit.formsemestre_change_lock(formsemestre_id)
+
     return flask.redirect(
         url_for(
             "notes.formsemestre_status",
@@ -1871,7 +1892,7 @@ def appreciation_add_form(
         app = apps[0]
         formsemestre_id = app["formsemestre_id"]
         etudid = app["etudid"]
-    vals = request.form if request.method == "POST" else request.args
+    vals = (request.form if request.method == "POST" else request.args).copy()
     if "edit" in vals:
         edit = int(vals["edit"])
     elif id:
diff --git a/app/views/scolar.py b/app/views/scolar.py
index f8168efb..41a2c6a5 100644
--- a/app/views/scolar.py
+++ b/app/views/scolar.py
@@ -1134,7 +1134,7 @@ def _etudident_create_or_edit_form(edit):
     "Le formulaire HTML"
     H = [html_sco_header.sco_header(init_jquery_ui=True)]
     F = html_sco_header.sco_footer()
-    vals = request.form if request.method == "POST" else request.args
+    vals = (request.form if request.method == "POST" else request.args).copy()
     etudid = vals.get("etudid", None)
     cnx = ndb.GetDBConnexion()
     descr = []
@@ -1177,7 +1177,7 @@ def _etudident_create_or_edit_form(edit):
     #     except ValueError:
     #         infos = None
     #         pass  # XXX a terminer
-    vals = request.form if request.method == "POST" else request.args
+    vals = (request.form if request.method == "POST" else request.args).copy()
     nom = vals.get("nom", None)
     if nom is None:
         nom = initvalues.get("nom", None)
diff --git a/app/views/users.py b/app/views/users.py
index 4c44161b..533b8d78 100644
--- a/app/views/users.py
+++ b/app/views/users.py
@@ -330,7 +330,7 @@ def create_user_form(user_name=None, edit=0, all_roles=1):
             },
         ),
     ]
-    vals = request.form if request.method == "POST" else request.args
+    vals = (request.form if request.method == "POST" else request.args).copy()
     if "tf_submitted" in vals and not "roles" in vals:
         vals["roles"] = []
     if "tf_submitted" in vals:
diff --git a/sco_version.py b/sco_version.py
index 8ec2aed9..41d1cfd9 100644
--- a/sco_version.py
+++ b/sco_version.py
@@ -1,7 +1,7 @@
 # -*- mode: python -*-
 # -*- coding: utf-8 -*-
 
-SCOVERSION = "9.0.39"
+SCOVERSION = "9.0.40"
 
 SCONAME = "ScoDoc"