diff --git a/debian.cfg b/debian.cfg
index bcf3960..1598e0f 100644
--- a/debian.cfg
+++ b/debian.cfg
@@ -41,9 +41,9 @@ d-i partman-lvm/device_remove_lvm boolean true
 d-i partman-md/device_remove_md boolean true
 d-i partman-auto/expert_recipe string
       boot-root ::                                            \
-              5120 1 112640 ext3                       \
+              5120 1 112640 ext4                       \
                       method{ format } format{ }              \
-                      use_filesystem{ } filesystem{ ext3 }    \
+                      use_filesystem{ } filesystem{ ext4 }    \
                       mountpoint{ / }                         \
               .                                               \
 d-i partman-partitioning/confirm_write_new_label boolean true