diff --git a/Containerfile b/Containerfile
index 9d4b9ce..79e039f 100644
--- a/Containerfile
+++ b/Containerfile
@@ -1,9 +1,7 @@
 # syntax=docker/dockerfile:1.20
 
-ARG PY_IMAGE=python:3.12-slim
-
 # Stage 1: Builder
-FROM ${PY_IMAGE} AS builder
+FROM docker.io/python:3.12-slim AS builder
 
 COPY --from=ghcr.io/astral-sh/uv:latest /uv /uvx /bin/
 
@@ -27,7 +25,7 @@ RUN uv sync --frozen --no-dev --no-cache --group backend
 
 
 # Stage 2: Runtime
-FROM ${PY_IMAGE} AS runtime
+FROM docker.io/python:3.12-alpine3.22 AS runtime
 
 ENV PYTHONDONTWRITEBYTECODE=1 \
     PYTHONUNBUFFERED=1 \
diff --git a/Containerfile.ml b/Containerfile.ml
index 833c039..2aa78a6 100644
--- a/Containerfile.ml
+++ b/Containerfile.ml
@@ -1,6 +1,6 @@
 # syntax=docker/dockerfile:1.20
 
-ARG PY_IMAGE=python:3.12-slim
+ARG PY_IMAGE=docker.io/python:3.12-slim
 
 # Stage 1: Builder
 FROM ${PY_IMAGE} AS builder