diff --git a/docker/summeruniversity/Dockerfile b/docker/summeruniversity/Dockerfile
index 19b10f5e..96425af0 100644
--- a/docker/summeruniversity/Dockerfile
+++ b/docker/summeruniversity/Dockerfile
@@ -1,5 +1,5 @@
 # FIXME use alpine
-FROM node:18.18.0
+FROM node:21.4.0
 
 RUN mkdir -p /usr/app/src \
 	&& mkdir -p /usr/app/media/headimages \