diff --git a/Pipfile b/Pipfile
index 6b9ef09..4cdac5c 100644
--- a/Pipfile
+++ b/Pipfile
@@ -20,4 +20,4 @@ pymdown-extensions = "*"
 mkdocs-pdf-export-plugin = "*"
 
 [requires]
-python_version = "3.9"
+python_version = "3.11"
diff --git a/docker/Dockerfile b/docker/Dockerfile
index a69567c..9ac4261 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -1,5 +1,5 @@
-FROM node:18-bullseye-slim
-MAINTAINER Glenn ROLLAND <glenux@glenux.net>
+FROM node:18-bookworm-slim
+LABEL maintainer="Glenn ROLLAND glenux@glenux.net"
 
 RUN apt-get update \
  && apt-get install -y --no-install-recommends python3 python3-pip pipenv \