diff --git a/CHANGES.md b/CHANGES.md
index 1807718..9688b1f 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,8 +1,8 @@
-# vNext
+# v0.4.0
 
 * Upgrade to dune
 * Use dune to generate opam metadata
-* Use 4.08 AST from ocaml-migrate-parsetree and ppx\_tools\_versioned
+* Use 4.10 AST from ocaml-migrate-parsetree and ppx\_tools\_versioned
 
 # v0.3.0
 
diff --git a/dune-project b/dune-project
index ddea3e1..e86270b 100644
--- a/dune-project
+++ b/dune-project
@@ -16,5 +16,5 @@
  (depends
   (ocaml (>= 4.02.3))
   (dune (>= 2.0))
-  ocaml-migrate-parsetree
+  (ocaml-migrate-parsetree (>= 1.5.0))
   ppx_tools_versioned))
diff --git a/ppx_defer.opam b/ppx_defer.opam
index dbcbef6..b751173 100644
--- a/ppx_defer.opam
+++ b/ppx_defer.opam
@@ -9,7 +9,7 @@ bug-reports: "https://github.com/hcarty/ppx_defer/issues"
 depends: [
   "ocaml" {>= "4.02.3"}
   "dune" {>= "2.0"}
-  "ocaml-migrate-parsetree"
+  "ocaml-migrate-parsetree" {>= "1.5.0"}
   "ppx_tools_versioned"
 ]
 build: [
diff --git a/src/dune b/src/dune
index b6c20e8..dc9edee 100644
--- a/src/dune
+++ b/src/dune
@@ -6,4 +6,4 @@
  (libraries compiler-libs.common ocaml-migrate-parsetree)
  (kind ppx_rewriter)
  (preprocess
-  (pps ppx_tools_versioned.metaquot_408)))
+  (pps ppx_tools_versioned.metaquot_410)))
diff --git a/src/ppx_defer.ml b/src/ppx_defer.ml
index 0e7cf47..1a7f410 100644
--- a/src/ppx_defer.ml
+++ b/src/ppx_defer.ml
@@ -1,5 +1,5 @@
 open Migrate_parsetree
-open OCaml_408.Ast
+open OCaml_410.Ast
 open Ast_mapper
 open Parsetree
 
@@ -68,5 +68,5 @@ let defer_mapper =
   }
 
 let () =
-  Driver.register ~name:"ppx_defer" Versions.ocaml_408
+  Driver.register ~name:"ppx_defer" Versions.ocaml_410
     (fun _config _cookies -> defer_mapper)