diff --git a/third_party/sandboxroot/repo.yaml b/third_party/sandboxroot/repo.yaml
new file mode 100644
index 0000000..d75de5c
--- /dev/null
+++ b/third_party/sandboxroot/repo.yaml
@@ -0,0 +1,9 @@
+repositories:
+- arch: x86_64
+  metalink: https://mirrors.fedoraproject.org/metalink?repo=fedora-37&arch=x86_64
+  name: 37-x86_64-primary-repo
+  gpgkey: https://storage.googleapis.com/monogon-infra-public/RPM-GPG-KEY-fedora-37-x86_64
+- arch: x86_64
+  metalink: https://mirrors.fedoraproject.org/metalink?repo=updates-released-f37&arch=x86_64
+  name: 37-x86_64-update-repo
+  gpgkey: https://storage.googleapis.com/monogon-infra-public/RPM-GPG-KEY-fedora-37-x86_64