diff --git a/backend/Dockerfile b/backend/Dockerfile
index daf2cf4..f62723f 100644
--- a/backend/Dockerfile
+++ b/backend/Dockerfile
@@ -2,7 +2,7 @@
 # Python 3.13-slim + FastAPI + uvicorn
 # System packages: WeasyPrint (libpango, libcairo), Pillow (libjpeg, libpng)
 
-FROM python:3.13-slim AS base
+FROM python:3.12-slim AS base
 
 # --- System packages for WeasyPrint and Pillow ---
 RUN apt-get update && apt-get install -y --no-install-recommends \