diff --git a/Dockerfile b/Dockerfile
index dcec2af..863c9c2 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,7 +1,7 @@
 FROM node:10.23.2-buster@sha256:888a229db7fce49cc970281998ee8ef1c7e1f6aab2b6c6d0d09af7ea98896a08 as build
 
 # renovate: datasource=github-tags depName=gchq/CyberChef versioning=semver
-ENV CYBERCHEF_VERSION v9.21.0
+ENV CYBERCHEF_VERSION v9.21.6
 
 RUN set -ex; \
     \