diff --git a/build-rootfs b/build-rootfs
index c3f9fe6..025c254 100755
--- a/build-rootfs
+++ b/build-rootfs
@@ -1,12 +1,12 @@
 #!/bin/sh
 
 workdir="$HOME/public/rootfs"
-filename="spark-x86_64-$(date '+%Y%m%d').tar.xz"
+filename="spark-x86_64-$(date '+%Y%m%d').tar.zst"
 
 cd "$workdir"
 
 podman create --name spark-rootfs localhost/spark:latest bash
-podman export spark-rootfs | xz > ".$filename.part"
+podman export spark-rootfs | zstd > ".$filename.part"
 podman rm spark-rootfs
 
 mv ".$filename.part" "$filename"