diff --git a/Dockerfile b/Dockerfile
index f159b06..ff3d0b8 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM node:20.14.0-bookworm-slim
+FROM node:20.15.0-bookworm-slim
 
 LABEL org.opencontainers.image.vendor="Swiss GRC AG"
 LABEL org.opencontainers.image.authors="Swiss GRC AG <opensource@swissgrc.com>"
diff --git a/README.md b/README.md
index 66e7c9e..1bd87eb 100644
--- a/README.md
+++ b/README.md
@@ -32,7 +32,7 @@ The following example shows the container used for linting the repository:
 | Tag      | Description                                                                                       | Base Image                 | Markdownlint-Cli | Size                                                                                                                                  |
 |----------|---------------------------------------------------------------------------------------------------|----------------------------|------------------|---------------------------------------------------------------------------------------------------------------------------------------|
 | latest   | Latest stable release (from `main` branch)                                                        | node:20.13.1-bookworm-slim | 0.41.0           | ![Docker Image Size (tag)](https://img.shields.io/docker/image-size/swissgrc/azure-pipelines-markdownlint/latest?style=flat-square)   |
-| unstable | Latest unstable release (from `develop` branch)                                                   | node:20.14.0-bookworm-slim | 0.41.0           | ![Docker Image Size (tag)](https://img.shields.io/docker/image-size/swissgrc/azure-pipelines-markdownlint/unstable?style=flat-square) |
+| unstable | Latest unstable release (from `develop` branch)                                                   | node:20.15.0-bookworm-slim | 0.41.0           | ![Docker Image Size (tag)](https://img.shields.io/docker/image-size/swissgrc/azure-pipelines-markdownlint/unstable?style=flat-square) |
 | 0.31.1   | [markdownlint-cli 0.31.1](https://github.com/igorshubovych/markdownlint-cli/releases/tag/v0.31.1) | node:18.4.0-bullseye       | 0.31.1           | ![Docker Image Size (tag)](https://img.shields.io/docker/image-size/swissgrc/azure-pipelines-markdownlint/0.31.1?style=flat-square)   |
 | 0.32.0   | [markdownlint-cli 0.32.0](https://github.com/igorshubovych/markdownlint-cli/releases/tag/v0.32.0) | node:18.6.0-bullseye       | 0.32.0           | ![Docker Image Size (tag)](https://img.shields.io/docker/image-size/swissgrc/azure-pipelines-markdownlint/0.32.0?style=flat-square)   |
 | 0.32.1   | [markdownlint-cli 0.32.1](https://github.com/igorshubovych/markdownlint-cli/releases/tag/v0.32.1) | node:18.6.0-bullseye       | 0.32.1           | ![Docker Image Size (tag)](https://img.shields.io/docker/image-size/swissgrc/azure-pipelines-markdownlint/0.32.1?style=flat-square)   |