diff --git a/app/espace-laureat/page.tsx b/app/espace-laureat/page.tsx
index 34bb65e..436d6a6 100644
--- a/app/espace-laureat/page.tsx
+++ b/app/espace-laureat/page.tsx
@@ -1,4 +1,6 @@
 import Badge from "@codegouvfr/react-dsfr/Badge";
+import { format } from "date-fns";
+import { fr } from "date-fns/locale/fr";
 import { redirect } from "next/navigation";
 
 import { getDemoDossierNumber } from "@/utils/demo";
@@ -16,6 +18,11 @@ export default async function EspaceLaureat() {
 
   const demoDossierNumber = getDemoDossierNumber();
   const dossier = await getDossier(demoDossierNumber);
+  const dateTraitement = format(
+    new Date(dossier.dateTraitement),
+    "dd MMMM yyyy",
+    { locale: fr },
+  );
 
   return (
     <div className="max-w-2xl pb-24">
@@ -23,7 +30,7 @@ export default async function EspaceLaureat() {
       <div>
         <h2>Dossier n°{dossier.number}</h2>
         <Badge severity="success">
-          {dossier.state} le {dossier.dateTraitement}
+          {dossier.state} le {dateTraitement}
         </Badge>
       </div>
     </div>
diff --git a/package-lock.json b/package-lock.json
index e026f2f..02a299e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -9,6 +9,7 @@
       "version": "0.1.0",
       "dependencies": {
         "@codegouvfr/react-dsfr": "^1.14.2",
+        "date-fns": "^4.1.0",
         "graphql": "^16.9.0",
         "graphql-request": "^7.1.2",
         "iron-session": "^8.0.3",
@@ -4978,6 +4979,16 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/date-fns": {
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/date-fns/-/date-fns-4.1.0.tgz",
+      "integrity": "sha512-Ukq0owbQXxa/U3EGtsdVBkR1w7KOQ5gIBqdH2hkvknzZPYvBxb/aa6E8L7tmjFtkwZBu3UXBbjIgPo/Ez4xaNg==",
+      "license": "MIT",
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/kossnocorp"
+      }
+    },
     "node_modules/debounce": {
       "version": "1.2.1",
       "resolved": "https://registry.npmjs.org/debounce/-/debounce-1.2.1.tgz",
diff --git a/package.json b/package.json
index c833625..9596c85 100644
--- a/package.json
+++ b/package.json
@@ -17,6 +17,7 @@
   },
   "dependencies": {
     "@codegouvfr/react-dsfr": "^1.14.2",
+    "date-fns": "^4.1.0",
     "graphql": "^16.9.0",
     "graphql-request": "^7.1.2",
     "iron-session": "^8.0.3",