diff --git a/sharedb.planx.uk/Dockerfile b/sharedb.planx.uk/Dockerfile
index 12d66af13c..a73f378e4e 100644
--- a/sharedb.planx.uk/Dockerfile
+++ b/sharedb.planx.uk/Dockerfile
@@ -1,5 +1,5 @@
 # 18.16.1 = LTS
-FROM node:18.16.1-alpine as base
+FROM node:21.1.0-alpine as base
 
 WORKDIR /sharedb
 RUN npm install -g pnpm@8.6.6