diff --git a/mkosi/mkosi.tools.conf/mkosi.conf.d/ubuntu/mkosi.sandbox/etc/apt/preferences.d/qemu-noble-proposed.pref b/mkosi/mkosi.tools.conf/mkosi.conf.d/ubuntu/mkosi.sandbox/etc/apt/preferences.d/qemu-noble-proposed.pref
deleted file mode 100644
index bcd313a3eff..00000000000
--- a/mkosi/mkosi.tools.conf/mkosi.conf.d/ubuntu/mkosi.sandbox/etc/apt/preferences.d/qemu-noble-proposed.pref
+++ /dev/null
@@ -1,3 +0,0 @@
-Package: src:qemu:any
-Pin: release a=noble-proposed
-Pin-Priority: 550
diff --git a/mkosi/mkosi.tools.conf/mkosi.conf.d/ubuntu/mkosi.sandbox/etc/apt/sources.list.d/noble-proposed.sources b/mkosi/mkosi.tools.conf/mkosi.conf.d/ubuntu/mkosi.sandbox/etc/apt/sources.list.d/noble-proposed.sources
deleted file mode 100644
index ccae0bef65c..00000000000
--- a/mkosi/mkosi.tools.conf/mkosi.conf.d/ubuntu/mkosi.sandbox/etc/apt/sources.list.d/noble-proposed.sources
+++ /dev/null
@@ -1,5 +0,0 @@
-Types: deb deb-src
-URIs: http://archive.ubuntu.com/ubuntu/
-Suites: noble-proposed
-Components: main universe
-Signed-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg