diff --git a/dashboards/Dockerfile-dev b/dashboards/Dockerfile-dev
index 623dc9d..d3fcc38 100644
--- a/dashboards/Dockerfile-dev
+++ b/dashboards/Dockerfile-dev
@@ -8,6 +8,9 @@ RUN apt-get update
 RUN mkdir zds
 WORKDIR zds
 
+RUN apt-get install -y locales
+RUN echo "fr_FR.UTF-8 UTF-8" | tee -a /etc/locale.gen && locale-gen fr_FR.UTF-8
+
 COPY app/requirements.txt .
 RUN pip install -r requirements.txt
 
diff --git a/dashboards/app/pages/data.py b/dashboards/app/pages/data.py
index 3779ace..3e65cbb 100644
--- a/dashboards/app/pages/data.py
+++ b/dashboards/app/pages/data.py
@@ -34,7 +34,7 @@
 )
 
 # Définir les paramètres linguistiques FR pour l'affichage des nombres
-locale.setlocale(locale.LC_NUMERIC, "fr_FR")
+locale.setlocale(locale.LC_NUMERIC, "fr_FR.utf8")
 
 # Fonction pour améliorer l'affichage des nombres (milliers, millions, milliards)
 def french_format(x: int) -> str: