diff --git a/client_net.ml b/client_net.ml
index df436be..68fe6d3 100644
--- a/client_net.ml
+++ b/client_net.ml
@@ -4,7 +4,7 @@
 open Lwt.Infix
 open Fw_utils
 
-module Netback = Netchannel.Backend.Make(Netchannel.Xenstore.Make(Os_xen.Xs))
+module Netback = Netchannel.Backend.Make(Netchannel.Xenstore.Make(OS.Xs))
 module ClientEth = Ethernet.Make(Netback)
 
 let src = Logs.Src.create "client_net" ~doc:"Client networking"
diff --git a/config.ml b/config.ml
index 55d8c42..ae4f8f4 100644
--- a/config.ml
+++ b/config.ml
@@ -33,7 +33,7 @@ let main =
       package "mirage-qubes";
       package "mirage-nat" ~min:"1.2.0";
       package "mirage-logs";
-      package "mirage-xen" ~min:"4.0.0";
+      package "mirage-xen" ~min:"5.0.0";
     ]
     "Unikernel.Main" (mclock @-> job)
 
diff --git a/dao.ml b/dao.ml
index 55d901e..a68cc64 100644
--- a/dao.ml
+++ b/dao.ml
@@ -30,7 +30,7 @@ module VifMap = struct
 end
 
 let directory ~handle dir =
-  Os_xen.Xs.directory handle dir >|= function
+  OS.Xs.directory handle dir >|= function
   | [""] -> []      (* XenStore client bug *)
   | items -> items
 
@@ -46,7 +46,7 @@ let vifs ~handle domid =
         | Some device_id ->
         let vif = { ClientVif.domid; device_id } in
         Lwt.try_bind
-          (fun () -> Os_xen.Xs.read handle (Printf.sprintf "%s/%d/ip" path device_id))
+          (fun () -> OS.Xs.read handle (Printf.sprintf "%s/%d/ip" path device_id))
           (fun client_ip ->
              let client_ip = Ipaddr.V4.of_string_exn client_ip in
              Lwt.return (Some (vif, client_ip))
@@ -61,10 +61,10 @@ let vifs ~handle domid =
       )
 
 let watch_clients fn =
-  Os_xen.Xs.make () >>= fun xs ->
+  OS.Xs.make () >>= fun xs ->
   let backend_vifs = "backend/vif" in
   Log.info (fun f -> f "Watching %s" backend_vifs);
-  Os_xen.Xs.wait xs (fun handle ->
+  OS.Xs.wait xs (fun handle ->
     begin Lwt.catch
       (fun () -> directory ~handle backend_vifs)
       (function
diff --git a/memory_pressure.ml b/memory_pressure.ml
index 92271da..ed5b7e5 100644
--- a/memory_pressure.ml
+++ b/memory_pressure.ml
@@ -6,7 +6,7 @@ open Lwt
 let src = Logs.Src.create "memory_pressure" ~doc:"Memory pressure monitor"
 module Log = (val Logs.src_log src : Logs.LOG)
 
-let total_pages = Os_xen.MM.Heap_pages.total ()
+let total_pages = OS.MM.Heap_pages.total ()
 let pagesize_kb = Io_page.page_size / 1024
 
 let meminfo ~used =
@@ -23,7 +23,7 @@ let meminfo ~used =
 
 let report_mem_usage used =
   Lwt.async (fun () ->
-    let open Os_xen in
+    let open OS in
     Xs.make () >>= fun xs ->
     Xs.immediate xs (fun h ->
       Xs.write h "memory/meminfo" (meminfo ~used)
@@ -32,16 +32,16 @@ let report_mem_usage used =
 
 let init () =
   Gc.full_major ();
-  let used = Os_xen.MM.Heap_pages.used () in
+  let used = OS.MM.Heap_pages.used () in
   report_mem_usage used
 
 let status () =
-  let used = Os_xen.MM.Heap_pages.used () |> float_of_int in
+  let used = OS.MM.Heap_pages.used () |> float_of_int in
   let frac = used /. float_of_int total_pages in
   if frac < 0.9 then `Ok
   else (
     Gc.full_major ();
-    let used = Os_xen.MM.Heap_pages.used () in
+    let used = OS.MM.Heap_pages.used () in
     report_mem_usage used;
     let frac = float_of_int used /. float_of_int total_pages in
     if frac > 0.9 then `Memory_critical