diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7adf46c..ea55f07 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Added
 - declare compatibility with `python3.11`
 
+### Changed
+- container image: upgraded alpine base image from v3.13.1 to v3.18.5
+
 ### Removed
 - compatibility with `python3.7`
 
diff --git a/Dockerfile b/Dockerfile
index 37c3002..fa58f82 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,8 +1,8 @@
 # sync with https://github.com/fphammerle/systemctl-mqtt/blob/master/Dockerfile
 
 # not using python:3.*-alpine cause glib-dev package depends on python3
-# https://pkgs.alpinelinux.org/package/v3.11/main/aarch64/glib-dev
-ARG BASE_IMAGE=docker.io/alpine:3.13.1
+# https://pkgs.alpinelinux.org/package/v3.18/main/aarch64/glib-dev
+ARG BASE_IMAGE=docker.io/alpine:3.18.5
 ARG SOURCE_DIR_PATH=/switchbot-mqtt