diff --git a/packages/core-service/Dockerfile b/packages/core-service/Dockerfile
index 83f288c..918ea57 100644
--- a/packages/core-service/Dockerfile
+++ b/packages/core-service/Dockerfile
@@ -9,8 +9,12 @@ RUN apk add --no-cache openssl
 
 # --- Dependencies Stage ---
 FROM base AS deps
+# Build-Tools fuer native Module (bcrypt)
+RUN apk add --no-cache python3 make g++
 COPY package.json package-lock.json* ./
 RUN npm ci --ignore-scripts
+# Native Module kompilieren (bcrypt)
+RUN npm rebuild bcrypt
 # Prisma Generate braucht die Schema-Dateien
 COPY prisma ./prisma
 RUN npx prisma generate --schema=prisma/core.schema.prisma
@@ -36,9 +40,16 @@ FROM base AS production
 WORKDIR /app
 ENV NODE_ENV=production
 
+# Build-Tools fuer native Module (bcrypt)
+RUN apk add --no-cache python3 make g++
+
 # Nur Produktions-Dependencies
 COPY package.json package-lock.json* ./
 RUN npm ci --omit=dev --ignore-scripts
+RUN npm rebuild bcrypt
+
+# Build-Tools entfernen (Image klein halten)
+RUN apk del python3 make g++
 
 # Prisma Client generieren
 COPY prisma ./prisma