diff --git a/Dockerfile b/Dockerfile
index ff85446..8807e5e 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM node:20.19.0-bullseye@sha256:0dfd6667a52fc2df79d2a9235b5db851c1164646900cb68dfa0b4aa81c6974d3 as build
+FROM node:21.7.3-bullseye@sha256:7374e262a514dd73abd4f0c1f960d7392f08d277feea19e6068980e7bfbcf414 as build
 
 # renovate: datasource=github-tags depName=gchq/CyberChef versioning=semver
 ENV CYBERCHEF_VERSION v10.19.4