diff --git a/CHANGES.md b/CHANGES.md
index 7203c4eeac..55356513d9 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,9 +1,13 @@
 # Unreleased
 
+### Added
 - Support for OxCaml unboxed named types (@art-w, #1407)
 - Support for OxCaml zero alloc definitions (@Leonidas-from-XIV, #1422, #1444)
-- Remove requirement for ppx_expect in tests (@jonludlam, #1445)
 - Support for OxCaml modalities (@art-w, #1420)
+- Support OxCaml 5.2.0minus39 (@jonludlam, #1469)
+
+### Fixed
+- Remove requirement for ppx_expect in tests (@jonludlam, #1445)
 - Fix resolving functor through `module type of` (@Leonidas-from-XIV, #1471)
 
 # 3.2.1
diff --git a/odoc.opam b/odoc.opam
index 21565bd8b4..5ad7d031f7 100644
--- a/odoc.opam
+++ b/odoc.opam
@@ -58,7 +58,7 @@ depends: [
 
 conflicts: [
   "ocaml-option-bytecode-only"
-  "oxcaml-compiler" {< "5.2.0minus31"}
+  "oxcaml-compiler" {< "5.2.0minus39"}
 ]
 
 x-extra-doc-deps: [
diff --git a/src/loader/cmi.ml b/src/loader/cmi.ml
index bc30e26666..756ee7ef63 100644
--- a/src/loader/cmi.ml
+++ b/src/loader/cmi.ml
@@ -315,6 +315,7 @@ let mark_type ty =
       | Tlink _ -> assert false
 #if defined OXCAML
       | Tquote typ -> loop visited typ
+      | Tquote_eval typ -> loop visited typ
       | Tsplice typ -> loop visited typ
       | Tof_kind _ -> ()
       | Trepr _ -> ()
@@ -499,7 +500,7 @@ let rec read_jkind_annotation (jk : Parsetree.jkind_annotation) =
   let open Kind in
   match jk.pjka_desc with
   | Pjk_default -> Default
-  | Pjk_abbreviation s -> Abbreviation (Env.Fragment.read_type s.txt)
+  | Pjk_abbreviation (s, _) -> Abbreviation (Env.Fragment.read_type s.txt)
   | Pjk_mod (jk', modes) ->
     let modes = List.map (fun (m : Parsetree.mode Location.loc) ->
       let (Parsetree.Mode s) = m.txt in s) modes in
@@ -665,6 +666,7 @@ let rec read_type_expr env typ =
       | Tlink _ -> assert false
 #if defined OXCAML
       | Tquote typ -> Quote (read_type_expr env typ)
+      | Tquote_eval typ -> Quote (read_type_expr env typ)
       | Tsplice typ -> Splice (read_type_expr env typ)
       | Tof_kind _ -> assert false
       | Trepr _ -> Any  (* oxcaml: representation annotations are ignored *)
diff --git a/src/loader/cmt.ml b/src/loader/cmt.ml
index d00b5d3e97..3681016038 100644
--- a/src/loader/cmt.ml
+++ b/src/loader/cmt.ml
@@ -44,7 +44,7 @@ let rec read_pattern env parent doc id_attrs pat =
 #if OCAML_VERSION < (5,2,0)
     | Tpat_var(id, _) ->
 #elif defined OXCAML
-    | Tpat_var(id, _, _uid, _, _) ->
+    | Tpat_var { id; _ } ->
 #else
     | Tpat_var(id, _, _uid) ->
 #endif
@@ -58,7 +58,7 @@ let rec read_pattern env parent doc id_attrs pat =
 #if OCAML_VERSION < (5,2, 0)
     | Tpat_alias(pat, id, _) ->
 #elif defined OXCAML
-    | Tpat_alias(pat, id, _, _, _, _, _) ->
+    | Tpat_alias { pattern = pat; id; _ } ->
 #elif OCAML_VERSION < (5,4,0)
     | Tpat_alias(pat, id, _,_) ->
 #else
@@ -120,6 +120,7 @@ let rec read_pattern env parent doc id_attrs pat =
 #if defined OXCAML
     | Tpat_unboxed_unit -> []
     | Tpat_unboxed_bool _ -> []
+    | Tpat_fun_layout _ -> []
 #endif
 
 let read_value_binding env parent id_attrs vb =
diff --git a/src/loader/cmti.ml b/src/loader/cmti.ml
index 10fda71abc..236478fa7e 100644
--- a/src/loader/cmti.ml
+++ b/src/loader/cmti.ml
@@ -163,6 +163,9 @@ let rec read_core_type env container ctyp =
     | Ttyp_call_pos -> Constr(Env.Path.read_type env.ident_env Predef.path_lexing_position, [])
     | Ttyp_of_kind _ -> assert false
     | Ttyp_repr _ -> Any  (* oxcaml: representation annotations are ignored *)
+    | Ttyp_newlayout (_, ct) ->
+        (* oxcaml: layout-variable binder; odoc ignores the layout vars *)
+        read_core_type env container ct
 #elif OCAML_VERSION >= (5,5,0)
   | Ttyp_functor (lbl, id, pkg, ret_type) ->
     let lbl = read_label lbl in
@@ -586,28 +589,33 @@ let rec read_with_constraint env global_parent parent (_, frag, constr) =
     | Twith_type decl ->
         let frag = Env.Fragment.read_type frag.Location.txt in
         let eq = read_type_equation env parent decl in
-          TypeEq(frag, eq)
+          Some (TypeEq(frag, eq))
     | Twith_module(p, _) ->
         let frag = Env.Fragment.read_module frag.Location.txt in
         let eq = read_module_equation env p in
-          ModuleEq(frag, eq)
+          Some (ModuleEq(frag, eq))
     | Twith_typesubst decl ->
         let frag = Env.Fragment.read_type frag.Location.txt in
         let eq = read_type_equation env parent decl in
-          TypeSubst(frag, eq)
+          Some (TypeSubst(frag, eq))
     | Twith_modsubst(p, _) ->
         let frag = Env.Fragment.read_module frag.Location.txt in
         let p = Env.Path.read_module env.ident_env p in
-          ModuleSubst(frag, p)
+          Some (ModuleSubst(frag, p))
 #if OCAML_VERSION >= (4,13,0)
     | Twith_modtype mty ->
         let frag = Env.Fragment.read_module_type frag.Location.txt in
         let mty = read_module_type env global_parent parent mty in
-        ModuleTypeEq(frag, mty)
+        Some (ModuleTypeEq(frag, mty))
     | Twith_modtypesubst mty ->
         let frag = Env.Fragment.read_module_type frag.Location.txt in
         let mty = read_module_type env global_parent parent mty in
-        ModuleTypeSubst(frag, mty)
+        Some (ModuleTypeSubst(frag, mty))
+#endif
+#if defined OXCAML
+    (* oxcaml: [with kind] constraints have no representation in odoc's
+       model, so they are dropped. *)
+    | Twith_jkind _ | Twith_jkindsubst _ -> None
 #endif
 
 and read_module_type env parent label_parent mty =
@@ -671,7 +679,7 @@ and read_module_type env parent label_parent mty =
 #endif
     | Tmty_with(body, subs) -> (
       let body = read_module_type env parent label_parent body in
-      let subs = List.map (read_with_constraint env parent label_parent) subs in
+      let subs = List.filter_map (read_with_constraint env parent label_parent) subs in
       match Odoc_model.Lang.umty_of_mty body with
       | Some w_expr ->
           With {w_substitutions=subs; w_expansion=None; w_expr }
diff --git a/src/loader/ident_env.ml b/src/loader/ident_env.ml
index 3dd81576c8..b52647e6a4 100644
--- a/src/loader/ident_env.ml
+++ b/src/loader/ident_env.ml
@@ -311,7 +311,7 @@ let rec read_pattern hide_item pat =
 #if OCAML_VERSION < (5,2,0)
   | Tpat_var(id, loc) ->
 #elif defined OXCAML
-  | Tpat_var(id, loc, _, _, _) ->
+  | Tpat_var { id; name = loc; _ } ->
 #else
   | Tpat_var(id, loc, _) ->
 #endif
@@ -319,7 +319,7 @@ let rec read_pattern hide_item pat =
 #if OCAML_VERSION < (5,2,0)
   | Tpat_alias(pat, id, loc) ->
 #elif defined OXCAML
-  | Tpat_alias(pat, id, loc, _, _, _, _) ->
+  | Tpat_alias { pattern = pat; id; name = loc; _ } ->
 #elif OCAML_VERSION < (5,4,0)
   | Tpat_alias(pat, id, loc, _) ->
 #else
@@ -367,6 +367,7 @@ let rec read_pattern hide_item pat =
 #if defined OXCAML
   | Tpat_unboxed_unit -> []
   | Tpat_unboxed_bool _ -> []
+  | Tpat_fun_layout _ -> []
 #endif
 
 let rec extract_structure_tree_items : bool -> Typedtree.structure_item list -> items list = fun hide_item items ->
diff --git a/src/loader/odoc_loader.ml b/src/loader/odoc_loader.ml
index 696cdb37b8..002e2d0489 100644
--- a/src/loader/odoc_loader.ml
+++ b/src/loader/odoc_loader.ml
@@ -243,7 +243,11 @@ let read_cmi ~make_root ~parent ~filename ~warnings_tag () =
       let name = name |> name_to_string in
       let id, sg =
         Cmi.read_interface parent name ~warnings_tag
+#if defined OXCAML
+          (Odoc_model.Compat.signature (fst cmi_info.cmi_sign))
+#else
           (Odoc_model.Compat.signature cmi_info.cmi_sign)
+#endif
       in
 #if defined OXCAML
       let imports =
diff --git a/src/loader/typedtree_traverse.ml b/src/loader/typedtree_traverse.ml
index e57e08047e..54f2d45271 100644
--- a/src/loader/typedtree_traverse.ml
+++ b/src/loader/typedtree_traverse.ml
@@ -14,7 +14,7 @@ module Analysis = struct
     else
       match expr.exp_desc with
 #if defined OXCAML
-      | Texp_ident (p, _, _, _, _, _) ->
+      | Texp_ident { path = p; _ } ->
 #else
       | Texp_ident (p, _, _) ->
 #endif
@@ -31,7 +31,7 @@ module Analysis = struct
         let () =
           match pat_desc with
 #if defined OXCAML
-          | Tpat_var (id, loc, _uid, _, _) -> (
+          | Tpat_var { id; name = loc; _ } -> (
 #elif OCAML_VERSION >= (5, 2, 0)
           | Tpat_var (id, loc, _uid) -> (
 #else
@@ -41,7 +41,7 @@ module Analysis = struct
               | Some x -> poses := x :: !poses
               | None -> ())
 #if defined OXCAML
-          | Tpat_alias (_, id, loc, _uid, _, _, _) -> (
+          | Tpat_alias { id; name = loc; _ } -> (
 #elif OCAML_VERSION >= (5, 4, 0)
           | Tpat_alias (_, id, loc, _uid, _ty) -> (
 #elif OCAML_VERSION >= (5, 2, 0)
diff --git a/src/syntax_highlighter/syntax_highlighter.ml b/src/syntax_highlighter/syntax_highlighter.ml
index 7145eda73c..e4f322eee7 100644
--- a/src/syntax_highlighter/syntax_highlighter.ml
+++ b/src/syntax_highlighter/syntax_highlighter.ml
@@ -145,15 +145,14 @@ let tag_of_token (tok : Parser.token) =
   | HASH_SUFFIX -> "HASH_SUFFIX"
   | KIND -> "KIND"
   | KIND_OF -> "KIND_OF"
+  | LAYOUT -> "LAYOUT"
   | LBRACKETCOLON -> "LBRACKETCOLON"
   | LESSLBRACKET -> "LESSLBRACKET"
   | LOCAL -> "LOCAL"
   | MOD -> "MOD"
-  | ONCE -> "ONCE"
   | OVERWRITE -> "OVERWRITE"
   | RBRACKETGREATER -> "RBRACKETGREATER"
   | STACK -> "STACK"
-  | UNIQUE -> "UNIQUE"
 #endif
 #if OCAML_VERSION >= (5,3,0)
   | METAOCAML_ESCAPE -> "METAOCAML_ESCAPE"
diff --git a/test/xref2/lib/common.cppo.ml b/test/xref2/lib/common.cppo.ml
index bc41ab9f0d..3cc3a1dd37 100644
--- a/test/xref2/lib/common.cppo.ml
+++ b/test/xref2/lib/common.cppo.ml
@@ -617,16 +617,23 @@ let my_compilation_unit id (s : Odoc_model.Lang.Signature.t) =
 }
 
 let mkresolver () =
-  Odoc_odoc.Resolver.create
- ~roots:None     ~important_digests:false
-    ~directories:(List.map Odoc_odoc.Fs.Directory.of_string
-#if OCAML_VERSION >= (5,2,0)
-  (let paths = Load_path.get_paths () in
-   List.filter (fun s -> s <> "") (paths.visible @ paths.hidden))
-#else
-    (Load_path.get_paths () |> List.filter (fun s -> s <> ""))
+  let str_dirs =
+#if defined OXCAML
+    let paths = Load_path.get_paths () in
+    let visible = List.map (fun (v : Clflags.visible_include) -> v.path) paths.visible in
+    visible @ paths.hidden
+#elif OCAML_VERSION >= (5,2,0)
+    let paths = Load_path.get_paths () in
+    paths.visible @ paths.hidden
+#else 
+    Load_path.get_paths ()
 #endif
-    ) ~open_modules:[]
+  in
+  let nonempty_str_dirs = List.filter (fun s -> s <> "") str_dirs in
+  let directories = List.map Odoc_odoc.Fs.Directory.of_string nonempty_str_dirs in
+  Odoc_odoc.Resolver.create
+    ~roots:None ~important_digests:false
+    ~directories ~open_modules:[]
 
 let warnings_options =
   { Odoc_model.Error.warn_error = false; print_warnings = true; warnings_tag = None }