diff --git a/README.md b/README.md
index 13c3316..7b5aa99 100644
--- a/README.md
+++ b/README.md
@@ -49,7 +49,7 @@ host that is guaranteed to not exist.)
 
 Then, run the build itself with
 
-    sudo mkdir -p /usr/local/cqrlog-alpha &&
+    sudo mkdir -p /usr/local/cqrlog-alpha && sudo chown $SUDO_USER /usr/local/cqrlog-alpha &&
     docker run -ti -u root -v $(pwd):/home/cqrlog/build \
       -v /usr/local/cqrlog-alpha:/usr/local/cqrlog-alpha this.registry.is.invalid/cqrlog-build
 
diff --git a/docker-build/Dockerfile b/docker-build/Dockerfile
index 527bd03..a67172e 100644
--- a/docker-build/Dockerfile
+++ b/docker-build/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu:focal
+FROM ubuntu:jammy
 
 RUN apt-get update && apt-get -y upgrade