diff --git a/Dockerfile b/Dockerfile
index 8649fc47..4a618779 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,6 @@
 # Base image pinned by its multi-arch index digest, so a re-pushed tag cannot
 # change what is built. Refresh the digest and the tag together.
-FROM python:3.11.17-slim-bookworm@sha256:0a310eeecf4e1f5a0743f9a6520c90c88d089c903ca5fd283f501e3a805f5f89 AS builder
+FROM python:3.11.18-slim-bookworm@sha256:94a8fee35252d06ab75856f15f12c7bae67b10e8a6da93c7fded82b2610926cd AS builder
 
 ENV PIP_DISABLE_PIP_VERSION_CHECK=1 \
     PIP_NO_CACHE_DIR=1
@@ -14,7 +14,7 @@ COPY pyproject.toml README.md LICENSE NOTICE ./
 COPY src ./src
 RUN python -m pip wheel --no-deps --no-build-isolation --wheel-dir /wheels .
 
-FROM python:3.11.17-slim-bookworm@sha256:0a310eeecf4e1f5a0743f9a6520c90c88d089c903ca5fd283f501e3a805f5f89 AS runtime
+FROM python:3.11.18-slim-bookworm@sha256:94a8fee35252d06ab75856f15f12c7bae67b10e8a6da93c7fded82b2610926cd AS runtime
 
 ENV PIP_DISABLE_PIP_VERSION_CHECK=1 \
     PIP_NO_CACHE_DIR=1 \