diff --git a/.github/workflows/build-and-test.yml b/.github/workflows/build-and-test.yml
index 2197c7e..ac87a95 100644
--- a/.github/workflows/build-and-test.yml
+++ b/.github/workflows/build-and-test.yml
@@ -13,9 +13,6 @@ jobs:
       matrix:
         os: [ubuntu-latest]
         ocaml-compiler:
-          - 4.05.x
-          - 4.06.x
-          - 4.07.x
           - 4.08.x
           - 4.09.x
           - 4.10.x
diff --git a/CHANGES.md b/CHANGES.md
index 4a09d67..2620925 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,8 +1,13 @@
+1.12.0
+------
+
+  * Support for OCaml 5.4 (#100, @octachron, backport #104, @egallego)
+  * Support for OCaml 4.5, 4.6, and 4.7 has been removed (#104, @egallego)
+
 1.11.0
 ------
 
-  * Support for OCaml 5.2 (#94, @kit-ty-kate, backport to 1.x by
-    @ejgallego #97)
+  * Support for OCaml 5.2 (#94, @kit-ty-kate)
 
 1.10.0
 ------
diff --git a/ppx_import.opam b/ppx_import.opam
index 9e9f653..690d65e 100644
--- a/ppx_import.opam
+++ b/ppx_import.opam
@@ -11,7 +11,7 @@ dev-repo: "git+https://github.com/ocaml-ppx/ppx_import.git"
 tags: [ "syntax" ]
 
 depends: [
-   "ocaml"                   {>= "4.05.0" &  < "4.10.0"  }
+   "ocaml"                   {>= "4.08.0" &  < "4.10.0"  }
 | ("ocaml"                   {>= "4.10.0"}
    "ppx_sexp_conv" {with-test & >= "v0.13.0"})
   "dune"                    {              >= "1.11.0"  }
diff --git a/src/compat/gen.ml b/src/compat/gen.ml
index 9a6c75a..30997bb 100644
--- a/src/compat/gen.ml
+++ b/src/compat/gen.ml
@@ -17,7 +17,10 @@ let include_table =
   ; ("types_type_kind", [(5, 2); (4, 13)])
   ; ("init_path", [(4, 9)])
   ; ("env_lookup", [(4, 10)])
-  ; ("types_desc", [(4, 14)]) ]
+  ; ("types_desc", [(4, 14)])
+  ; ("tuple", [5,4])
+  ; ("longident", [5,4])
+  ]
 
 let rec gen_compat real_version (f_prefix, version_list) =
   match version_list with
diff --git a/src/compat/longident_ge_000.ml b/src/compat/longident_ge_000.ml
new file mode 100644
index 0000000..09a8752
--- /dev/null
+++ b/src/compat/longident_ge_000.ml
@@ -0,0 +1,2 @@
+let longident_inj x = x
+let longident_proj x = x
diff --git a/src/compat/longident_ge_504.ml b/src/compat/longident_ge_504.ml
new file mode 100644
index 0000000..2e82333
--- /dev/null
+++ b/src/compat/longident_ge_504.ml
@@ -0,0 +1,2 @@
+let longident_inj = Location.mknoloc
+let longident_proj x = x.Location.txt
diff --git a/src/compat/tuple_ge_000.ml b/src/compat/tuple_ge_000.ml
new file mode 100644
index 0000000..1694863
--- /dev/null
+++ b/src/compat/tuple_ge_000.ml
@@ -0,0 +1,2 @@
+let tuple f xs =
+  Ppxlib.Ast_helper.Typ.tuple (List.map (fun x -> f x) xs)
diff --git a/src/compat/tuple_ge_504.ml b/src/compat/tuple_ge_504.ml
new file mode 100644
index 0000000..7b74c6a
--- /dev/null
+++ b/src/compat/tuple_ge_504.ml
@@ -0,0 +1,2 @@
+let tuple f xs =
+  Ppxlib.Ast_helper.Typ.tuple (List.map (fun (_,x) -> f x) xs)
diff --git a/src/ppx_import.ml b/src/ppx_import.ml
index 3c4c828..e916412 100644
--- a/src/ppx_import.ml
+++ b/src/ppx_import.ml
@@ -27,14 +27,17 @@ let lazy_env =
       Compat.init_path ();
       Ocaml_common.Compmisc.initial_env () )
 
-let string_of_lid lid =
-  let rec print lid acc =
-    match lid with
-    | Longident.Lident s -> s :: acc
-    | Longident.Ldot (lid, id) -> print lid ("." :: id :: acc)
-    | Longident.Lapply (la, lb) -> print la ("(" :: print lb (")" :: acc))
-  in
-  String.concat "" (print lid [])
+let string_of_lid' lid = Format.asprintf "%a" Pprintast.longident lid
+let string_of_lid lid = Format.asprintf "%a" Astlib.Pprintast.longident lid
+
+(* Remove locations *)
+let rec longident_without_loc =
+  let proj x = Compat.longident_proj x in
+  let conv x = longident_without_loc (proj x) in
+  function
+  | Longident.Ldot (x,y) -> Astlib.Longident.Ldot (conv x, proj y)
+  | Longident.Lapply (f,x) ->  Astlib.Longident.Lapply (conv f, conv x)
+  | Longident.Lident x -> Astlib.Longident.Lident x
 
 let try_find_module ~loc env lid =
   (* Note: we are careful to call `Env.lookup_module` and not
@@ -68,7 +71,7 @@ let try_find_module_type ~loc env lid =
       | None ->
         Location.raise_errorf ~loc
           "[%%import]: cannot access the signature of the abstract module %s"
-          (string_of_lid lid)
+          (string_of_lid' lid)
       | Some module_type -> module_type )
   with Not_found -> None
 
@@ -93,12 +96,16 @@ let open_module_type ~loc env lid module_type =
 let locate_sig ~loc env lid =
   let head, path =
     match Ppxlib.Longident.flatten_exn lid with
-    | head :: path -> (Longident.Lident head, path)
+    | head :: path -> (head, path)
     | _ -> assert false
+    | exception Invalid_argument _ ->
+      Location.raise_errorf ~loc
+        "[%%import] cannot import a functor application %s"
+          (string_of_lid lid)
   in
+  let chead = Longident.Lident head in
   let head_module_type =
-    match
-      (try_find_module ~loc env head, lazy (try_find_module_type ~loc env head))
+    match (try_find_module ~loc env chead, lazy (try_find_module_type ~loc env chead))
     with
     | Some mty, _ -> mty
     | None, (lazy (Some mty)) -> mty
@@ -124,10 +131,10 @@ let locate_sig ~loc env lid =
     let sub_module_type =
       loop (List.map Compat.migrate_signature_item sig_items)
     in
-    (Longident.Ldot (lid, path_item), sub_module_type)
+    (Astlib.Longident.Ldot(lid,path_item), sub_module_type)
   in
   let _lid, sub_module_type =
-    List.fold_left get_sub_module_type (head, head_module_type) path
+    List.fold_left get_sub_module_type (Astlib.Longident.Lident head, head_module_type) path
   in
   open_module_type ~loc env lid sub_module_type
 
@@ -164,7 +171,7 @@ let get_modtype_decl ~loc sig_items parent_lid elem =
       elem (string_of_lid parent_lid)
   | Some decl -> decl
 
-let longident_of_path = Untypeast.lident_of_path
+let longident_of_path x = longident_without_loc (Untypeast.lident_of_path x)
 
 let mknoloc (txt : 'a) : 'a Ppxlib.Location.loc =
   {txt; loc = Ppxlib.Location.none}
@@ -187,8 +194,7 @@ let rec core_type_of_type_expr ~subst (type_expr : Ocaml_common.Types.type_expr)
       | _ -> lhs
     in
     Ppxlib.Ast_helper.Typ.arrow label lhs (core_type_of_type_expr ~subst rhs)
-  | Ttuple xs ->
-    Ppxlib.Ast_helper.Typ.tuple (List.map (core_type_of_type_expr ~subst) xs)
+  | Ttuple xs -> Compat.tuple (core_type_of_type_expr ~subst) xs
   | Tconstr (path, args, _) -> (
     let lid = longident_of_path path in
     let args = List.map (core_type_of_type_expr ~subst) args in
@@ -387,11 +393,11 @@ let type_declaration ~tool_name ~input_name (type_decl : Ppxlib.type_declaration
                 Location.raise_errorf ~loc
                   "[%%import] cannot import a functor application %s"
                   (string_of_lid lid)
-              | Lident _ as head_id ->
+              | Lident hid ->
                 (* In this case, we know for sure that the user intends this lident
                    as a type name, so we use Typetexp.find_type and let the failure
                    cases propagate to the user. *)
-                Compat.find_type env ~loc head_id |> snd
+                Compat.find_type env ~loc (Lident hid) |> snd
               | Ldot (parent_id, elem) ->
                 let sig_items = locate_sig ~loc env parent_id in
                 get_type_decl ~loc sig_items parent_id elem
@@ -484,11 +490,11 @@ let module_type ~tool_name ~input_name (package_type : Ppxlib.package_type) =
             Location.raise_errorf ~loc
               "[%%import] cannot import a functor application %s"
               (string_of_lid lid)
-          | Longident.Lident _ as head_id ->
+          | Longident.Lident head_id ->
             (* In this case, we know for sure that the user intends this lident
                as a module type name, so we use Typetexp.find_type and
                let the failure cases propagate to the user. *)
-            Compat.find_modtype env ~loc head_id |> snd
+            Compat.find_modtype env ~loc (Lident head_id) |> snd
           | Longident.Ldot (parent_id, elem) ->
             let sig_items = locate_sig ~loc env parent_id in
             get_modtype_decl ~loc sig_items parent_id elem
diff --git a/src_test/ppx_deriving/test_ppx_import.ml b/src_test/ppx_deriving/test_ppx_import.ml
index c06de65..8772d4e 100644
--- a/src_test/ppx_deriving/test_ppx_import.ml
+++ b/src_test/ppx_deriving/test_ppx_import.ml
@@ -38,6 +38,12 @@ module Test_optional : S_optional = struct
   let f ?(opt = 0) () = ignore opt
 end
 
+module Location = struct
+  type t = Location.t
+  let pp = Location.print_loc
+  type 'a loc = [%import: 'a Location.loc] [@@deriving show]
+end
+
 type longident = [%import: Longident.t] [@@deriving show]
 
 type package_type =
@@ -47,7 +53,8 @@ type package_type =
       core_type := (Parsetree.core_type [@printer Pprintast.core_type]);
       Asttypes.loc :=
         (Asttypes.loc [@polyprinter fun pp fmt x -> pp fmt x.Asttypes.txt]);
-      Longident.t := (Longident.t [@printer pp_longident])] )]
+      Longident.t := (Longident.t [@printer pp_longident]);
+      attributes := (Parsetree.attributes [@printer (fun _ _ -> ())])])]
 [@@deriving show]
 
 module type Hashable = [%import: (module Hashtbl.HashedType)]