diff --git a/Dockerfile b/Dockerfile
index 6dec5fd..702869b 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM docker.io/library/node:20.9.0-alpine3.18 AS build
+FROM docker.io/library/node:21.4.0-alpine3.18 AS build
 
 ARG MARKDOWNLINT_VERSION=master