diff --git a/docker/Dockerfile b/docker/Dockerfile
index 14abdb7..0e02708 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu:20.04
+FROM ubuntu:22.04
 
 RUN sed -i.bak -e "s%http://archive.ubuntu.com/ubuntu/%http://jp.archive.ubuntu.com/ubuntu/%g" /etc/apt/sources.list
 RUN sed -i.bak -e "s%http://security.ubuntu.com/ubuntu/%http://jp.archive.ubuntu.com/ubuntu/%g" /etc/apt/sources.list