diff --git a/challenge/Dockerfile b/challenge/Dockerfile
index 2fe0953..7399115 100644
--- a/challenge/Dockerfile
+++ b/challenge/Dockerfile
@@ -1,7 +1,7 @@
 # sudo docker build -t system_health_check .
 # sudo docker run -d -p 1024:1024 --rm -it system_health_check
 
-FROM ubuntu:19.10
+FROM ubuntu:22.04
 
 RUN apt-get update
 
@@ -14,7 +14,7 @@ COPY system_health_check .
 COPY flag .
 COPY ynetd .
 
-RUN chown -R root:root /home/ctf
+RUN chown -R ctf:ctf /home/ctf
 
 USER ctf
 EXPOSE 1024