diff --git a/deps/sefs b/deps/sefs
index e0cf9c10..a843c678 160000
--- a/deps/sefs
+++ b/deps/sefs
@@ -1 +1 @@
-Subproject commit e0cf9c102875e9589ac862766cb8a17f94bfbee4
+Subproject commit a843c6783ae14842225bb6777616dc707a657583
diff --git a/src/libos/src/fs/hostfs.rs b/src/libos/src/fs/hostfs.rs
index 37b7f154..2bc7763c 100644
--- a/src/libos/src/fs/hostfs.rs
+++ b/src/libos/src/fs/hostfs.rs
@@ -23,7 +23,8 @@ pub struct HNode {
 
 impl FileSystem for HostFS {
     fn sync(&self) -> Result<()> {
-        unimplemented!()
+        warn!("HostFS: sync is unimplemented");
+        Ok(())
     }
 
     fn root_inode(&self) -> Arc<INode> {