diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index f254cac..c492adb 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -43,7 +43,8 @@ cache:
   image: quay.io/containers/buildah:latest
   variables:
     STORAGE_DRIVER: vfs
-    BUILDAH_ISOLATION: oci
+    BUILDAH_FORMAT: oci
+    BUILDAH_ISOLATION: chroot
   before_script:
     - buildah login -u "$CI_REGISTRY_USER" -p "$CI_REGISTRY_PASSWORD" $CI_REGISTRY