diff --git a/.github/workflows/mkosi.yml b/.github/workflows/mkosi.yml
index b9ccd02c3a..1d71471a90 100644
--- a/.github/workflows/mkosi.yml
+++ b/.github/workflows/mkosi.yml
@@ -76,7 +76,7 @@ jobs:
 
     steps:
     - uses: actions/checkout@8e5e7e5ab8b370d6c329ec480221332ada57f0ab
-    - uses: systemd/mkosi@8fde39857993c2120bcc6e480dab9fbb47dc2a7e
+    - uses: systemd/mkosi@87a6b70ea9ab529b95fc91306fc8151175999dca
 
     - name: Configure
       run: |
diff --git a/mkosi.conf.d/11-centos-8/mkosi.conf b/mkosi.conf.d/11-centos-8/mkosi.conf
index cde54e9e6e..6b6ab8cccd 100644
--- a/mkosi.conf.d/11-centos-8/mkosi.conf
+++ b/mkosi.conf.d/11-centos-8/mkosi.conf
@@ -3,3 +3,6 @@
 [Match]
 Distribution=centos
 Release=8
+
+[Distribution]
+PackageManagerTrees=mkosi.reposdir:/etc/yum.repos.d