diff --git a/src/Domain/Manga/Application/CommandHandler/RefreshMangaChaptersHandler.php b/src/Domain/Manga/Application/CommandHandler/RefreshMangaChaptersHandler.php
index 4e58337..67f6702 100644
--- a/src/Domain/Manga/Application/CommandHandler/RefreshMangaChaptersHandler.php
+++ b/src/Domain/Manga/Application/CommandHandler/RefreshMangaChaptersHandler.php
@@ -26,18 +26,26 @@ readonly class RefreshMangaChaptersHandler
             throw new \RuntimeException('Manga not found');
         }
 
-        // Synchronisation + récupération des nouveaux IDs
-        $newChapterIds = $this->chapterSynchronizationService->synchronizeChapters($manga);
+        // Synchronisation + récupération des numéros de nouveaux chapitres
+        $newChapterNumbers = $this->chapterSynchronizationService->synchronizeChapters($manga);
 
         // Mise à jour de la date de monitoring
         $manga->updateLastMonitoringCheck(new \DateTimeImmutable());
         $this->mangaRepository->save($manga);
 
         // Événement de scraping pour chaque nouveau chapitre
-        foreach ($newChapterIds as $chapterId) {
-            $this->eventBus->dispatch(
-                new ChapterReadyForScraping(new ChapterId($chapterId))
+        // On retrouve l'ID réel (PK integer) après save() car le chapitre n'a
+        // son identifiant définitif qu'une fois persisté en base.
+        foreach ($newChapterNumbers as $chapterNumber) {
+            $saved = $this->mangaRepository->findChapterByMangaIdAndNumber(
+                $manga->getId()->getValue(),
+                $chapterNumber
             );
+            if ($saved) {
+                $this->eventBus->dispatch(
+                    new ChapterReadyForScraping(new ChapterId($saved->getId()))
+                );
+            }
         }
     }
 }
diff --git a/src/Domain/Manga/Domain/Contract/Service/ChapterSynchronizationServiceInterface.php b/src/Domain/Manga/Domain/Contract/Service/ChapterSynchronizationServiceInterface.php
index ff44389..1e93473 100644
--- a/src/Domain/Manga/Domain/Contract/Service/ChapterSynchronizationServiceInterface.php
+++ b/src/Domain/Manga/Domain/Contract/Service/ChapterSynchronizationServiceInterface.php
@@ -9,7 +9,7 @@ interface ChapterSynchronizationServiceInterface
     /**
      * Synchronise les chapitres d'un manga depuis la source externe.
      *
-     * @return string[] IDs des nouveaux chapitres ajoutés
+     * @return float[] Numéros des nouveaux chapitres ajoutés
      */
     public function synchronizeChapters(Manga $manga): array;
 }
diff --git a/src/Domain/Manga/Infrastructure/Service/MangadxChapterSynchronizationService.php b/src/Domain/Manga/Infrastructure/Service/MangadxChapterSynchronizationService.php
index a935770..d76f021 100644
--- a/src/Domain/Manga/Infrastructure/Service/MangadxChapterSynchronizationService.php
+++ b/src/Domain/Manga/Infrastructure/Service/MangadxChapterSynchronizationService.php
@@ -96,11 +96,11 @@ readonly class MangadxChapterSynchronizationService implements ChapterSynchroniz
 
         $newChapterIds = [];
 
-        // Sauvegarde uniquement les nouveaux chapitres et collecte leurs IDs
+        // Sauvegarde uniquement les nouveaux chapitres et collecte leurs numéros
         foreach ($chaptersByNumber as $chapterNumber => $chapter) {
             if (!isset($existingChapters[(float) $chapterNumber])) {
                 $manga->addChapter($chapter);
-                $newChapterIds[] = $chapter->getId();
+                $newChapterIds[] = $chapter->getNumber();
             }
         }
 
diff --git a/tests/Domain/Manga/Adapter/InMemoryChapterSynchronizationService.php b/tests/Domain/Manga/Adapter/InMemoryChapterSynchronizationService.php
index 5ce6b30..53a8cd2 100644
--- a/tests/Domain/Manga/Adapter/InMemoryChapterSynchronizationService.php
+++ b/tests/Domain/Manga/Adapter/InMemoryChapterSynchronizationService.php
@@ -18,8 +18,8 @@ class InMemoryChapterSynchronizationService implements ChapterSynchronizationSer
             'synchronized_at' => new \DateTimeImmutable(),
         ];
 
-        // Retourne les IDs des chapitres synchronisés (simulation)
-        return ['chapter-1', 'chapter-2'];
+        // Retourne les numéros des chapitres synchronisés (simulation)
+        return [1.0, 2.0];
     }
 
     /**