diff --git a/CHANGES b/CHANGES
index b514de95..ded19c04 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,6 @@
+===== 6.1.0 (2022-03-08) =====
+* Adjust the server-side interface of Os_session.disconnect_all
+
 ===== 4.0.0 (2021-01-13) =====
 * BREAKING CHANGE Os_tips: change the type of 'onclose'
 
diff --git a/opam b/opam
index 4d79bc4f..588ff778 100644
--- a/opam
+++ b/opam
@@ -1,6 +1,6 @@
 opam-version: "2.0"
 name: "ocsigen-start"
-version: "6.0.1"
+version: "6.1.0"
 authors: "dev@ocsigen.org"
 maintainer: "dev@ocsigen.org"
 synopsis: "An Eliom application skeleton ready to use to build your own application with users, (pre)registration, notifications, etc"
@@ -23,7 +23,7 @@ depends: [
   "pgocaml_ppx" {>= "4.0"}
   "safepass" {>= "3.0"}
   "ocsigen-i18n" {>= "4.0.0"}
-  "eliom" {>= "9.3.0" & < "10.0.0"}
+  "eliom" {>= "10.0.0" & < "11.0.0"}
   "ocsigen-toolkit" {>= "2.7.0"}
   "ocsigen-ppx-rpc"
   "ocsigen-i18n" {>= "3.7.0"}
diff --git a/src/os_session.eliom b/src/os_session.eliom
index 85c04ebd..c172def4 100644
--- a/src/os_session.eliom
+++ b/src/os_session.eliom
@@ -120,7 +120,9 @@ let set_warn_connection_change, warn_connection_changed =
   let r = ref (fun _ -> ()) in
   (fun f -> r := f), fun state -> !r state; Lwt.return_unit
 
-let disconnect_all ?userid ?(user_indep = true) () =
+let disconnect_all ?sitedata ?userid ?(user_indep = true) ?(with_restart = true)
+    ()
+  =
   let close_my_sessions = userid = None in
   let%lwt () =
     if close_my_sessions then pre_close_session_action () else Lwt.return_unit
@@ -163,7 +165,7 @@ let disconnect_all ?userid ?(user_indep = true) () =
                 let%lwt acc = acc in
                 Lwt.return (s :: acc))
           Lwt.return_nil
-          (Eliom_state.Ext.fold_volatile_sub_states
+          (Eliom_state.Ext.fold_volatile_sub_states ?sitedata
              ~state:
                (Eliom_state.Ext.volatile_data_group_state
                   ~scope:Eliom_common.default_group_scope group_name)
@@ -174,8 +176,8 @@ let disconnect_all ?userid ?(user_indep = true) () =
       let%lwt () =
         Lwt_list.iter_s
           (fun state ->
-            Eliom_state.Ext.iter_sub_states ~state @@ fun state ->
-            Eliom_state.Ext.discard_state ~state)
+            Eliom_state.Ext.iter_sub_states ?sitedata ~state @@ fun state ->
+            Eliom_state.Ext.discard_state ?sitedata ~state ())
           states
       in
       let%lwt () =
@@ -187,7 +189,8 @@ let disconnect_all ?userid ?(user_indep = true) () =
       let%lwt () =
         Lwt_list.iter_s
           (fun state ->
-            Eliom_state.Ext.iter_sub_states ~state warn_connection_changed)
+            Eliom_state.Ext.iter_sub_states ?sitedata ~state
+              warn_connection_changed)
           ui_states
       in
       (* Closing user_indep states, if requested: *)
@@ -195,11 +198,13 @@ let disconnect_all ?userid ?(user_indep = true) () =
         if user_indep
         then
           Lwt_list.iter_s
-            (fun state -> Eliom_state.Ext.discard_state ~state)
+            (fun state -> Eliom_state.Ext.discard_state ?sitedata ~state ())
             ui_states
         else Lwt.return_unit
       in
-      let _ = [%client (Os_handlers.restart () : unit)] in
+      let () =
+        if with_restart then ignore [%client (Os_handlers.restart () : unit)]
+      in
       Lwt.return_unit
 
 let check_allow_deny userid allow deny =
diff --git a/src/os_session.eliomi b/src/os_session.eliomi
index c4eebe04..0fd8d282 100644
--- a/src/os_session.eliomi
+++ b/src/os_session.eliomi
@@ -86,13 +86,25 @@ val connect : ?expire:bool -> Os_types.User.id -> unit Lwt.t
 *)
 
 val disconnect_all
-  :  ?userid:Os_types.User.id
+  :  ?sitedata:Eliom_common.sitedata
+  -> ?userid:Os_types.User.id
   -> ?user_indep:bool
+  -> ?with_restart:bool
   -> unit
   -> unit Lwt.t
 (** Close all sessions of current user (or [userid] if present).
     If [?user_indep] is [true]
     (default), will also affect [user_indep_session_scope].
+    If [?with_restart] is [true]
+    (default), will also restart the client.
+    If you do not call the function during
+    a request or during the initialisation phase of the Eliom module:
+
+    - [?userid] must not be [None]
+    - [?with_restart] must be [false]
+    - you must provide the extra parameter [?sitedata],
+      that you can get by calling [Eliom_request_info.get_sitedata]
+      during the initialisation phase of the Eliom module.
 *)
 
 [%%client.start]
diff --git a/template.distillery/PROJECT_NAME.opam b/template.distillery/PROJECT_NAME.opam
index 834674b2..5bec042a 100644
--- a/template.distillery/PROJECT_NAME.opam
+++ b/template.distillery/PROJECT_NAME.opam
@@ -4,7 +4,7 @@ version: "0.1"
 synopsis: "Pseudo package for defining project dependencies"
 
 depends: [
-  "eliom" {>= "9.3.0" & < "10.0.0"}
+  "eliom" {>= "10.0.0" & < "11.0.0"}
   "ocsipersist-pgsql" {>= "1.0" & < "2.0"}
   "ocsigen-start"
 ]