diff --git a/apps/participation/forms.py b/apps/participation/forms.py
index 7217f7c..f49856c 100644
--- a/apps/participation/forms.py
+++ b/apps/participation/forms.py
@@ -4,7 +4,7 @@ from django import forms
 from django.core.exceptions import ValidationError
 from django.utils.translation import gettext_lazy as _
 
-from .models import Team
+from .models import Team, Participation
 
 
 class TeamForm(forms.ModelForm):
@@ -36,3 +36,9 @@ class JoinTeamForm(forms.ModelForm):
     class Meta:
         model = Team
         fields = ('access_code',)
+
+
+class ParticipationForm(forms.ModelForm):
+    class Meta:
+        model = Participation
+        fields = ('problem',)
diff --git a/apps/participation/models.py b/apps/participation/models.py
index 70c07f6..8f3ac3b 100644
--- a/apps/participation/models.py
+++ b/apps/participation/models.py
@@ -2,6 +2,8 @@ from django.core.validators import RegexValidator
 from django.db import models
 from django.db.models import Index
 from django.utils.crypto import get_random_string
+from django.utils.functional import lazy
+from django.utils.text import format_lazy
 from django.utils.translation import gettext_lazy as _
 
 
@@ -56,7 +58,7 @@ class Participation(models.Model):
     )
 
     problem = models.IntegerField(
-        choices=[(i, _("Problem #{problem:d}").format(problem=i)) for i in range(1, 5)],
+        choices=[(i, format_lazy(_("Problem #{problem:d}"), problem=i)) for i in range(1, 5)],
         null=True,
         default=None,
         verbose_name=_("problem number"),
diff --git a/apps/participation/templates/participation/create_team.html b/apps/participation/templates/participation/create_team.html
index 1be29f5..1c93537 100644
--- a/apps/participation/templates/participation/create_team.html
+++ b/apps/participation/templates/participation/create_team.html
@@ -10,4 +10,4 @@
         </div>
         <button class="btn btn-success" type="submit">{% trans "Create" %}</button>
     </form>
-{% endblock content %}
\ No newline at end of file
+{% endblock content %}
diff --git a/apps/participation/templates/participation/create_team_modal.html b/apps/participation/templates/participation/create_team_modal.html
index 242c645..6163660 100644
--- a/apps/participation/templates/participation/create_team_modal.html
+++ b/apps/participation/templates/participation/create_team_modal.html
@@ -1,4 +1,4 @@
-{% load crispy_forms_filters i18n %}
+{% load i18n %}
 
 <div id="createTeamModal" class="modal fade" tabindex="-1" role="dialog">
     <div class="modal-dialog" role="document">
diff --git a/apps/participation/templates/participation/join_team_modal.html b/apps/participation/templates/participation/join_team_modal.html
index 9b9deee..89aa7ca 100644
--- a/apps/participation/templates/participation/join_team_modal.html
+++ b/apps/participation/templates/participation/join_team_modal.html
@@ -1,4 +1,4 @@
-{% load crispy_forms_filters i18n %}
+{% load i18n %}
 
 <div id="joinTeamModal" class="modal fade" tabindex="-1" role="dialog">
     <div class="modal-dialog" role="document">
diff --git a/apps/participation/templates/participation/team_detail.html b/apps/participation/templates/participation/team_detail.html
index 0388bbd..e04d0dd 100644
--- a/apps/participation/templates/participation/team_detail.html
+++ b/apps/participation/templates/participation/team_detail.html
@@ -27,8 +27,25 @@
             <dd class="col-sm-6">{{ team.students.all|join:", "|default:any }}</dd>
 
             <dt class="col-sm-6 text-right">{% trans "Chosen problem:" %}</dt>
-            <dd class="col-sm-6">{{ team.participation.problem|default:any }}</dd>
+            <dd class="col-sm-6">{{ team.participation.get_problem_display|default:any }}</dd>
         </dl>
     </div>
+    <div class="card-footer text-center">
+        <button class="btn btn-primary" data-toggle="modal" data-target="#updateTeamModal">{% trans "Update" %}</button>
     </div>
+    </div>
+
+    {% include "participation/update_team_modal.html" %}
+{% endblock %}
+
+{% block extrajavascript %}
+    <script>
+        $(document).ready(function() {
+            $('button[data-target="#updateTeamModal"]').click(function() {
+                let modalBody = $("#updateTeamModal div.modal-body");
+                if (!modalBody.html().trim())
+                    modalBody.load("{% url "participation:update_team" pk=team.pk %} #form-content");
+            });
+        });
+    </script>
 {% endblock %}
diff --git a/apps/participation/templates/participation/update_team.html b/apps/participation/templates/participation/update_team.html
new file mode 100644
index 0000000..28f0d28
--- /dev/null
+++ b/apps/participation/templates/participation/update_team.html
@@ -0,0 +1,15 @@
+{% extends "base.html" %}
+
+{% load crispy_forms_filters i18n %}
+
+{% block content %}
+    <form method="post">
+        <div id="form-content">
+            {% csrf_token %}
+            {{ form|crispy }}
+            {{ participation_form|crispy }}
+        </div>
+        <button class="btn btn-success" type="submit">{% trans "Update" %}</button>
+    </form>
+{% endblock content %}
+
diff --git a/apps/participation/templates/participation/update_team_modal.html b/apps/participation/templates/participation/update_team_modal.html
new file mode 100644
index 0000000..82901f9
--- /dev/null
+++ b/apps/participation/templates/participation/update_team_modal.html
@@ -0,0 +1,21 @@
+{% load i18n %}
+
+<div id="updateTeamModal" class="modal fade" tabindex="-1" role="dialog">
+    <div class="modal-dialog" role="document">
+        <form method="post" action="{% url "participation:update_team" pk=team.pk %}">
+            <div class="modal-content">
+                <div class="modal-header">
+                    <h5 class="modal-title">{% trans "Update team" %}</h5>
+                    <button type="button" class="close" data-dismiss="modal" aria-label="Close">
+                        <span aria-hidden="true">&times;</span>
+                    </button>
+                </div>
+                <div class="modal-body"></div>
+                <div class="modal-footer">
+                    <button type="submit" class="btn btn-primary">{% trans "Update" %}</button>
+                    <button type="button" class="btn btn-secondary" data-dismiss="modal">{% trans "Close" %}</button>
+                </div>
+            </div>
+        </form>
+    </div>
+</div>
\ No newline at end of file
diff --git a/apps/participation/urls.py b/apps/participation/urls.py
index aa1b4da..7334b0f 100644
--- a/apps/participation/urls.py
+++ b/apps/participation/urls.py
@@ -1,6 +1,6 @@
 from django.urls import path
 
-from .views import CreateTeamView, JoinTeamView, MyTeamDetailView, TeamDetailView
+from .views import CreateTeamView, JoinTeamView, MyTeamDetailView, TeamDetailView, TeamUpdateView
 
 
 app_name = "participation"
@@ -10,4 +10,5 @@ urlpatterns = [
     path("join_team/", JoinTeamView.as_view(), name="join_team"),
     path("team/", MyTeamDetailView.as_view(), name="my_team_detail"),
     path("team/<int:pk>/", TeamDetailView.as_view(), name="team_detail"),
+    path("team/<int:pk>/update/", TeamUpdateView.as_view(), name="update_team"),
 ]
diff --git a/apps/participation/views.py b/apps/participation/views.py
index 130fa32..ec24622 100644
--- a/apps/participation/views.py
+++ b/apps/participation/views.py
@@ -3,9 +3,9 @@ from django.core.exceptions import PermissionDenied
 from django.db import transaction
 from django.urls import reverse_lazy
 from django.utils.translation import gettext_lazy as _
-from django.views.generic import CreateView, FormView, DetailView, RedirectView
+from django.views.generic import CreateView, FormView, DetailView, RedirectView, UpdateView
 
-from participation.forms import TeamForm, JoinTeamForm
+from participation.forms import TeamForm, JoinTeamForm, ParticipationForm
 from participation.models import Team
 
 
@@ -74,3 +74,27 @@ class MyTeamDetailView(LoginRequiredMixin, RedirectView):
 
 class TeamDetailView(LoginRequiredMixin, DetailView):
     model = Team
+
+
+class TeamUpdateView(LoginRequiredMixin, UpdateView):
+    model = Team
+    form_class = TeamForm
+    template_name = "participation/update_team.html"
+
+    def get_context_data(self, **kwargs):
+        context = super().get_context_data(**kwargs)
+        context["participation_form"] = ParticipationForm(data=self.request.POST or None,
+                                                          instance=self.object.participation)
+        return context
+
+    @transaction.atomic
+    def form_valid(self, form):
+        participation_form = ParticipationForm(data=self.request.POST or None, instance=self.object.participation)
+        if not participation_form.is_valid():
+            return self.form_invalid(form)
+
+        participation_form.save()
+        return super().form_valid(form)
+
+    def get_success_url(self):
+        return reverse_lazy("participation:team_detail", args=(self.object.pk,))
diff --git a/locale/fr/LC_MESSAGES/django.po b/locale/fr/LC_MESSAGES/django.po
index 7bfee47..3fbf590 100644
--- a/locale/fr/LC_MESSAGES/django.po
+++ b/locale/fr/LC_MESSAGES/django.po
@@ -7,7 +7,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: Corres2math\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2020-09-24 09:53+0200\n"
+"POT-Creation-Date: 2020-09-24 11:08+0200\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "Last-Translator: Yohann D'ANELLO <yohann.danello@animath.fr>\n"
 "Language-Team: LANGUAGE <LL@li.org>\n"
@@ -32,6 +32,7 @@ msgstr "Cette tâche a échoué avec succès."
 #: apps/eastereggs/templates/eastereggs/xp_modal.html:16
 #: apps/participation/templates/participation/create_team_modal.html:16
 #: apps/participation/templates/participation/join_team_modal.html:16
+#: apps/participation/templates/participation/update_team_modal.html:16
 #: apps/registration/templates/registration/login_modal.html:16
 msgid "Close"
 msgstr "Fermer"
@@ -101,7 +102,7 @@ msgstr "changelogs"
 msgid "Changelog of type \"{action}\" for model {model} at {timestamp}"
 msgstr "Changelog de type \"{action}\" pour le modèle {model} le {timestamp}"
 
-#: apps/participation/forms.py:14 apps/participation/models.py:18
+#: apps/participation/forms.py:14 apps/participation/models.py:20
 msgid "The trigram must be composed of three uppercase letters."
 msgstr "Le trigramme doit être composé de trois lettres majuscules."
 
@@ -109,27 +110,27 @@ msgstr "Le trigramme doit être composé de trois lettres majuscules."
 msgid "No team was found with this access code."
 msgstr "Aucune équipe n'a été trouvée avec ce code d'accès."
 
-#: apps/participation/models.py:11
+#: apps/participation/models.py:13
 msgid "name"
 msgstr "nom"
 
-#: apps/participation/models.py:17
+#: apps/participation/models.py:19
 msgid "trigram"
 msgstr "trigramme"
 
-#: apps/participation/models.py:25
+#: apps/participation/models.py:27
 msgid "access code"
 msgstr "code d'accès"
 
-#: apps/participation/models.py:26
+#: apps/participation/models.py:28
 msgid "The access code let other people to join the team."
 msgstr "Le code d'accès permet aux autres participants de rejoindre l'équipe."
 
-#: apps/participation/models.py:30
+#: apps/participation/models.py:32
 msgid "Grant Animath to publish my video"
 msgstr "Autoriser Animath à publier ma vidéo"
 
-#: apps/participation/models.py:31
+#: apps/participation/models.py:33
 msgid ""
 "Give the authorisation to publish the video on the main website to promote "
 "the action."
@@ -137,80 +138,80 @@ msgstr ""
 "Donner l'autorisation de publier la vidéo sur le site principal pour "
 "promouvoir les Correspondances."
 
-#: apps/participation/models.py:41
+#: apps/participation/models.py:43
 #, python-brace-format
 msgid "Team {name} ({trigram})"
 msgstr "Équipe {name} ({trigram})"
 
-#: apps/participation/models.py:44 apps/participation/models.py:55
+#: apps/participation/models.py:46 apps/participation/models.py:57
 #: apps/registration/models.py:73 apps/registration/models.py:106
 msgid "team"
 msgstr "équipe"
 
-#: apps/participation/models.py:45
+#: apps/participation/models.py:47
 msgid "teams"
 msgstr "équipes"
 
-#: apps/participation/models.py:59
+#: apps/participation/models.py:61
 #, python-brace-format
 msgid "Problem #{problem:d}"
 msgstr "Problème n°{problem:d}"
 
-#: apps/participation/models.py:62
+#: apps/participation/models.py:64
 msgid "problem number"
 msgstr "numéro de problème"
 
-#: apps/participation/models.py:71
+#: apps/participation/models.py:73
 msgid "solution video"
 msgstr "vidéo de solution"
 
-#: apps/participation/models.py:80
+#: apps/participation/models.py:82
 msgid "received participation"
 msgstr "participation reçue"
 
-#: apps/participation/models.py:89
+#: apps/participation/models.py:91
 msgid "synthesis video"
 msgstr "vidéo de synthèse"
 
-#: apps/participation/models.py:93
+#: apps/participation/models.py:95
 #, python-brace-format
 msgid "Participation of the team {name} ({trigram})"
 msgstr "Participation de l'équipe {name} ({trigram})"
 
-#: apps/participation/models.py:96 apps/participation/models.py:104
+#: apps/participation/models.py:98 apps/participation/models.py:106
 msgid "participation"
 msgstr "participation"
 
-#: apps/participation/models.py:97
+#: apps/participation/models.py:99
 msgid "participations"
 msgstr "participations"
 
-#: apps/participation/models.py:108
+#: apps/participation/models.py:110
 msgid "link"
 msgstr "lien"
 
-#: apps/participation/models.py:109
+#: apps/participation/models.py:111
 msgid "The full video link."
 msgstr "Le lien complet de la vidéo."
 
-#: apps/participation/models.py:115
+#: apps/participation/models.py:117
 msgid "valid"
 msgstr "valide"
 
-#: apps/participation/models.py:116
+#: apps/participation/models.py:118
 msgid "The video got the validation of the administrators."
 msgstr "La vidéo a été validée par les administrateurs."
 
-#: apps/participation/models.py:120
+#: apps/participation/models.py:122
 #, python-brace-format
 msgid "Video of team {name} ({trigram})"
 msgstr "Vidéo de l'équipe {name} ({trigram})"
 
-#: apps/participation/models.py:124
+#: apps/participation/models.py:126
 msgid "video"
 msgstr "vidéo"
 
-#: apps/participation/models.py:125
+#: apps/participation/models.py:127
 msgid "videos"
 msgstr "vidéos"
 
@@ -220,7 +221,7 @@ msgid "Create"
 msgstr "Créer"
 
 #: apps/participation/templates/participation/create_team_modal.html:8
-#: apps/participation/views.py:15 templates/base.html:76
+#: apps/participation/views.py:15 templates/base.html:70
 msgid "Create team"
 msgstr "Créer une équipe"
 
@@ -230,7 +231,7 @@ msgid "Join"
 msgstr "Rejoindre"
 
 #: apps/participation/templates/participation/join_team_modal.html:8
-#: apps/participation/views.py:41 templates/base.html:81
+#: apps/participation/views.py:41 templates/base.html:75
 msgid "Join team"
 msgstr "Rejoindre une équipe"
 
@@ -262,6 +263,16 @@ msgstr "Participants :"
 msgid "Chosen problem:"
 msgstr "Problème choisi :"
 
+#: apps/participation/templates/participation/team_detail.html:34
+#: apps/participation/templates/participation/update_team.html:12
+#: apps/participation/templates/participation/update_team_modal.html:15
+msgid "Update"
+msgstr "Modifier"
+
+#: apps/participation/templates/participation/update_team_modal.html:8
+msgid "Update team"
+msgstr "Modifier l'équipe"
+
 #: apps/participation/views.py:23 apps/participation/views.py:49
 msgid "You don't participate, so you can't create a team."
 msgstr "Vous ne participez pas, vous ne pouvez pas créer d'équipe."
@@ -410,7 +421,7 @@ msgstr "Se reconnecter"
 #: apps/registration/templates/registration/login_modal.html:8
 #: apps/registration/templates/registration/login_modal.html:15
 #: apps/registration/templates/registration/password_reset_complete.html:10
-#: templates/base.html:114 templates/registration/login.html:7
+#: templates/base.html:108 templates/registration/login.html:7
 #: templates/registration/login.html:8 templates/registration/login.html:25
 msgid "Log in"
 msgstr "Connexion"
@@ -604,42 +615,38 @@ msgstr ""
 "avec les détails de l'erreur. Vous pouvez désormais retourner voir des "
 "vidéos."
 
-#: templates/base.html:70
+#: templates/base.html:64
 msgid "Home"
 msgstr "Accueil"
 
-#: templates/base.html:87
+#: templates/base.html:81
 msgid "My team"
 msgstr "Mon équipe"
 
-#: templates/base.html:94
+#: templates/base.html:88
 msgid "Make a gift"
 msgstr "Faire un don"
 
-#: templates/base.html:98
+#: templates/base.html:92
 msgid "Administration"
 msgstr "Administration"
 
-#: templates/base.html:105
+#: templates/base.html:99
 msgid "Return to admin view"
 msgstr "Retourner à l'interface administrateur"
 
-#: templates/base.html:110
+#: templates/base.html:104
 msgid "Register"
 msgstr "S'inscrire"
 
-#: templates/base.html:119
+#: templates/base.html:120
 msgid "Log out"
 msgstr "Déconnexion"
 
-#: templates/base.html:145
+#: templates/base.html:147
 msgid "Contact us"
 msgstr "Nous contacter"
 
-#: templates/base.html:168
-msgid "Back to top"
-msgstr "Retour en haut"
-
 #: templates/registration/login.html:13
 #, python-format
 msgid ""
@@ -652,3 +659,6 @@ msgstr ""
 #: templates/registration/login.html:23
 msgid "Forgotten your password or username?"
 msgstr "Mot de passe oublié ?"
+
+#~ msgid "Back to top"
+#~ msgstr "Retour en haut"