diff --git a/cannamanage-frontend/Dockerfile b/cannamanage-frontend/Dockerfile
index 238f76b..a7bc0c5 100644
--- a/cannamanage-frontend/Dockerfile
+++ b/cannamanage-frontend/Dockerfile
@@ -13,12 +13,17 @@ COPY . .
 
 ENV NEXT_TELEMETRY_DISABLED=1
 # Provide placeholder build-time values so Next.js SSG doesn't crash on undefined URLs
-# Real values are injected at runtime via docker-compose environment:
+# Real values are injected at runtime via docker-compose environment.
+# NextAuth v5 uses AUTH_URL (not NEXTAUTH_URL) as its canonical base URL.
 ARG NEXTAUTH_URL=http://localhost:3000
+ARG AUTH_URL=http://localhost:3000
 ARG NEXTAUTH_SECRET=build-time-placeholder-secret-minimum-32-chars
+ARG AUTH_SECRET=build-time-placeholder-secret-minimum-32-chars
 ARG BACKEND_URL=http://localhost:8080
 ENV NEXTAUTH_URL=${NEXTAUTH_URL}
+ENV AUTH_URL=${AUTH_URL}
 ENV NEXTAUTH_SECRET=${NEXTAUTH_SECRET}
+ENV AUTH_SECRET=${AUTH_SECRET}
 ENV BACKEND_URL=${BACKEND_URL}
 RUN pnpm build