diff --git a/Dockerfile b/Dockerfile
index a6c101b..95abaab 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,6 @@
 # syntax=docker/dockerfile:1
 # The base image is pinned by digest; Dependabot (M2) will propose updates.
-FROM python:3.13-slim-bookworm@sha256:a1165e272e578941b84abc79e4ab38a0305cd12803a5c4247979ac7655f4d641 AS build
+FROM python:3.15-slim-bookworm@sha256:4e03260adeeebafccd084f3584e6b84823aba5651cfb53ef8a078ed441ddf9cd AS build
 RUN pip install --no-cache-dir uv==0.11.32
 ENV UV_COMPILE_BYTECODE=1 \
     UV_LINK_MODE=copy \
@@ -12,7 +12,7 @@ RUN uv sync --frozen --no-dev --no-install-project
 COPY src ./src
 RUN uv sync --frozen --no-dev --no-editable
 
-FROM python:3.13-slim-bookworm@sha256:a1165e272e578941b84abc79e4ab38a0305cd12803a5c4247979ac7655f4d641
+FROM python:3.15-slim-bookworm@sha256:4e03260adeeebafccd084f3584e6b84823aba5651cfb53ef8a078ed441ddf9cd
 ENV PATH=/app/.venv/bin:$PATH \
     PYTHONDONTWRITEBYTECODE=1 \
     PYTHONUNBUFFERED=1 \