diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index b7d06679..2a370125 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -7,34 +7,37 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ocaml-version: [ '4.13.1', '4.10.0', '4.08.1' ]
+        ocaml-version: [ '5', '4', '4.10.0', '4.08.1' ]
         operating-system: [macos-latest, ubuntu-latest, windows-latest]
+        exclude:
+          - operating-system: macos-latest
+            ocaml-version: ['4.10.0', '4.08.1']
     steps:
-    - uses: actions/checkout@v2
-    - uses: avsm/setup-ocaml@v1
+    - uses: actions/checkout@v4
+    - uses: ocaml/setup-ocaml@v3
       with:
-        ocaml-version: ${{ matrix.ocaml-version }}
-    - run: opam pin add -n .
-    - name: Packages
-      run: opam depext -yt cstruct cstruct-sexp cstruct-unix cstruct-lwt
+        ocaml-compiler: ${{ matrix.ocaml-version }}
+    - run: opam install . --deps-only --with-test
     - name: Build
-      run: opam install -t cstruct cstruct-sexp cstruct-unix cstruct-lwt
+      run: opam exec -- dune build
+    - run: opam exec -- dune runtest
   ppx:
     name: PPX
     runs-on: ${{ matrix.operating-system }}
     strategy:
       fail-fast: false
       matrix:
-        ocaml-version: [ '4.13.1', '4.10.0', '4.08.1' ]
+        ocaml-version: [ '5', '4', '4.10.0', '4.08.1' ]
         operating-system: [macos-latest, ubuntu-latest, windows-latest]
+        exclude:
+          - operating-system: macos-latest
+            ocaml-version: ['4.10.0', '4.08.1']
     steps:
-    - uses: actions/checkout@v2
-    - uses: avsm/setup-ocaml@v1
+    - uses: actions/checkout@v4
+    - uses: ocaml/setup-ocaml@v3
       with:
-        ocaml-version: ${{ matrix.ocaml-version }}
+        ocaml-compiler: ${{ matrix.ocaml-version }}
     - run: opam pin add -n .
-    - name: Packages
-      run: opam depext -yt ppx_cstruct
     - name: Build
       run: opam install -t ppx_cstruct
   async:
@@ -43,15 +46,16 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ocaml-version: [ '4.13.1', '4.10.0', '4.08.1' ]
+        ocaml-version: [ '5', '4', '4.10.0', '4.08.1' ]
         operating-system: [macos-latest, ubuntu-latest]
+        exclude:
+          - operating-system: macos-latest
+            ocaml-version: ['4.10.0', '4.08.1']
     steps:
-    - uses: actions/checkout@v2
-    - uses: avsm/setup-ocaml@v1
+    - uses: actions/checkout@v4
+    - uses: ocaml/setup-ocaml@v3
       with:
-        ocaml-version: ${{ matrix.ocaml-version }}
+        ocaml-compiler: ${{ matrix.ocaml-version }}
     - run: opam pin add -n .
-    - name: Packages
-      run: opam depext -yt cstruct-async
     - name: Dependencies
       run: opam install -t cstruct-async
diff --git a/cstruct-sexp.opam b/cstruct-sexp.opam
index 3cfbbcd9..2dc8a07e 100644
--- a/cstruct-sexp.opam
+++ b/cstruct-sexp.opam
@@ -18,9 +18,10 @@ build: [
 depends: [
   "ocaml" {>= "4.08.0"}
   "dune" {>= "2.0.0"}
-  "sexplib"
+  "sexplib0"
   "cstruct" {=version}
   "alcotest" {with-test}
+  "sexplib" {with-test}
 ]
 synopsis: "S-expression serialisers for C-like structures"
 description: """
diff --git a/lib/cstruct_sexp.ml b/lib/cstruct_sexp.ml
index d3c8def2..7e1f9174 100644
--- a/lib/cstruct_sexp.ml
+++ b/lib/cstruct_sexp.ml
@@ -14,21 +14,18 @@
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  *)
 
-open Sexplib
+open Sexplib0
 
 type buffer = Cstruct.buffer
 type t = Cstruct.t
 
-let buffer_of_sexp b = Conv.bigstring_of_sexp b
-let sexp_of_buffer b = Conv.sexp_of_bigstring b
-
 let t_of_sexp = function
   | Sexp.Atom str ->
       let n = String.length str in
       let t = Cstruct.create_unsafe n in
       Cstruct.blit_from_string str 0 t 0 n ;
       t
-  | sexp -> Conv.of_sexp_error "Cstruct.t_of_sexp: atom needed" sexp
+  | sexp -> Sexp_conv.of_sexp_error "Cstruct.t_of_sexp: atom needed" sexp
 
 let sexp_of_t t =
   let n   = Cstruct.length t in
@@ -36,3 +33,9 @@ let sexp_of_t t =
   Cstruct.blit_to_bytes t 0 str 0 n ;
   (* The following call is safe, since str is not visible elsewhere. *)
   Sexp.Atom (Bytes.unsafe_to_string str)
+
+let buffer_of_sexp b =
+  (t_of_sexp b).Cstruct.buffer
+
+let sexp_of_buffer b =
+  sexp_of_t (Cstruct.of_bigarray b)
diff --git a/lib/cstruct_sexp.mli b/lib/cstruct_sexp.mli
index 62f2842a..cb816b88 100644
--- a/lib/cstruct_sexp.mli
+++ b/lib/cstruct_sexp.mli
@@ -19,19 +19,19 @@
 type buffer = Cstruct.buffer
 (** [buffer] is an alias for the corresponding {!type:Cstruct.buffer} type *)
 
-val sexp_of_buffer : Cstruct.buffer -> Sexplib.Sexp.t
+val sexp_of_buffer : Cstruct.buffer -> Sexplib0.Sexp.t
 (** [sexp_of_buffer b] returns the s-expression representation of the raw memory buffer [b] *)
 
-val buffer_of_sexp : Sexplib.Sexp.t -> Cstruct.buffer
+val buffer_of_sexp : Sexplib0.Sexp.t -> Cstruct.buffer
 (** [buffer_of_sexp s] returns a fresh memory buffer from the s-expression [s].
     [s] should have been constructed using {!sexp_of_buffer}. *)
 
 type t = Cstruct.t
 (** [t] is an alias for the corresponding {!Cstruct.t} type *)
 
-val sexp_of_t : t -> Sexplib.Sexp.t
+val sexp_of_t : t -> Sexplib0.Sexp.t
 (** [sexp_of_t t] returns the s-expression representation of the Cstruct [t] *)
 
-val t_of_sexp : Sexplib.Sexp.t -> t
+val t_of_sexp : Sexplib0.Sexp.t -> t
 (** [t_of_sexp s] returns a fresh {!Cstruct.t} that represents the
      s-expression previously serialised by {!sexp_of_t}. *)
diff --git a/lib/dune b/lib/dune
index c1fa1de3..cddb67f5 100644
--- a/lib/dune
+++ b/lib/dune
@@ -13,4 +13,4 @@
  (name cstruct_sexp)
  (public_name cstruct-sexp)
  (modules cstruct_sexp)
- (libraries cstruct sexplib))
+ (libraries cstruct sexplib0))
diff --git a/lib_test/dune b/lib_test/dune
index 16fb7d97..aab31566 100644
--- a/lib_test/dune
+++ b/lib_test/dune
@@ -1,5 +1,5 @@
 (executable
- (libraries cstruct alcotest cstruct-sexp)
+ (libraries cstruct alcotest cstruct-sexp sexplib)
  (modules bounds tests)
  (name tests))
 
diff --git a/ppx/dune b/ppx/dune
index c16ee848..98500c52 100644
--- a/ppx/dune
+++ b/ppx/dune
@@ -6,4 +6,4 @@
  (ppx_runtime_libraries cstruct)
  (preprocess
   (pps ppxlib.metaquot))
- (libraries sexplib ppxlib))
+ (libraries sexplib0 ppxlib))
diff --git a/ppx/ppx_cstruct.ml b/ppx/ppx_cstruct.ml
index 3525db88..defd9c72 100644
--- a/ppx/ppx_cstruct.ml
+++ b/ppx/ppx_cstruct.ml
@@ -392,7 +392,7 @@ type cenum =
   { name : string Loc.t;
     fields : (string Loc.t * int64) list;
     prim : prim;
-    sexp : bool;
+    sexp : [ `None | `Sexp_of | `Sexp ];
   }
 
 let enum_op_name cenum =
@@ -429,17 +429,17 @@ let enum_integer ~loc {prim; _} =
 
 let declare_enum_expr ~loc ({fields; _} as cenum) = function
   | Enum_to_sexp ->
-    [%expr fun x -> Sexplib.Sexp.Atom ([%e Ast.evar ~loc (enum_op_name cenum Enum_print)] x) ]
+    [%expr fun x -> Sexplib0.Sexp.Atom ([%e Ast.evar ~loc (enum_op_name cenum Enum_print)] x) ]
   | Enum_of_sexp ->
     [%expr
       fun x ->
         match x with
-        | Sexplib.Sexp.List _ ->
-          raise (Sexplib.Pre_sexp.Of_sexp_error (Failure "expected Atom, got List", x))
-        | Sexplib.Sexp.Atom v ->
+        | Sexplib0.Sexp.List _ ->
+          raise (Sexplib0.Sexp.Of_sexp_error (Failure "expected Atom, got List", x))
+        | Sexplib0.Sexp.Atom v ->
           match [%e Ast.evar ~loc (enum_op_name cenum Enum_parse)] v with
           | None ->
-            raise (Sexplib.Pre_sexp.Of_sexp_error (Failure "unable to parse enum string", x))
+            raise (Sexplib0.Sexp.Of_sexp_error (Failure "unable to parse enum string", x))
           | Some r -> r
     ]
   | Enum_get ->
@@ -474,12 +474,15 @@ let enum_ops_for {sexp; _} =
   Enum_compare ::
   Enum_print ::
   Enum_parse ::
-  if sexp then
+  match sexp with
+  | `None -> []
+  | `Sexp_of ->
+    [ Enum_to_sexp ]
+  | `Sexp ->
+
     [ Enum_to_sexp
     ; Enum_of_sexp
     ]
-  else
-    []
 
 let enum_type_decl {name; fields; _} =
   let decls = List.map (fun (f,_) -> Type.constructor f) fields in
@@ -508,8 +511,8 @@ let enum_op_type ~loc {name; prim; _} =
   | Enum_set -> [%type: [%t cty] -> [%t oty]]
   | Enum_print -> [%type: [%t cty] -> string]
   | Enum_parse -> [%type: string -> [%t cty] option]
-  | Enum_to_sexp -> [%type: [%t cty] -> Sexplib.Sexp.t]
-  | Enum_of_sexp -> [%type: Sexplib.Sexp.t -> [%t cty]]
+  | Enum_to_sexp -> [%type: [%t cty] -> Sexplib0.Sexp.t]
+  | Enum_of_sexp -> [%type: Sexplib0.Sexp.t -> [%t cty]]
   | Enum_compare -> [%type: [%t cty] -> [%t cty] -> int]
 
 let output_enum_sig loc (cenum:cenum) =
@@ -598,11 +601,14 @@ let cenum decl =
   in
   let width, sexp =
     match attrs with
-    | ({attr_name = {txt = width; _};attr_payload= PStr [];_}) 
+    | ({attr_name = {txt = width; _};attr_payload= PStr [];_})
       :: ({attr_name = {txt = "sexp"; _};attr_payload = PStr []; _}) :: [] ->
-      width, true
+      width, `Sexp
+    | ({attr_name = {txt = width; _};attr_payload= PStr [];_})
+      :: ({attr_name = {txt = "sexp_of"; _};attr_payload = PStr []; _}) :: [] ->
+      width, `Sexp_of
     | ({attr_name = {txt = width; _};attr_payload= PStr [];_}) :: [] ->
-      width, false
+      width, `None
     | _ ->
       loc_err loc "invalid cenum attributes"
   in
diff --git a/ppx_cstruct.opam b/ppx_cstruct.opam
index 264ad415..74a7c64e 100644
--- a/ppx_cstruct.opam
+++ b/ppx_cstruct.opam
@@ -22,12 +22,12 @@ depends: [
   "ounit" {with-test}
   "ppxlib" {>= "0.16.0"}
   "ppx_sexp_conv" {with-test}
-  "sexplib" {>="v0.9.0"}
+  "sexplib0"
   "cstruct-sexp" {with-test}
   "cppo" {with-test}
   "cstruct-unix" {with-test & =version}
-  "ocaml-migrate-parsetree" {>= "2.1.0" & with-test}
   "lwt_ppx" {>= "2.0.2" & with-test}
+  "sexplib0" {>="v0.9.0" & with-test}
 ]
 synopsis: "Access C-like structures directly from OCaml"
 description: """
diff --git a/ppx_test/basic.ml b/ppx_test/basic.ml
index 02131dac..e49624f6 100644
--- a/ppx_test/basic.ml
+++ b/ppx_test/basic.ml
@@ -185,7 +185,7 @@ let tests () =
   assert(get_foo_b be = 44);
   assert(get_foo_a be = 7);
   hexdump_foo be;
-  print_endline (Sexplib.Sexp.to_string_hum (Cstruct_sexp.sexp_of_t be));
+  print_endline (Sexplib0.Sexp.to_string_hum (Cstruct_sexp.sexp_of_t be));
   hexdump_with_ignored_field (Cstruct.of_hex "010203")
 
 let () = tests ()
diff --git a/ppx_test/dune b/ppx_test/dune
index 3f85e8c6..d4045d39 100644
--- a/ppx_test/dune
+++ b/ppx_test/dune
@@ -1,7 +1,7 @@
 (tests
  (names pcap basic enum)
  (deps http.cap)
- (libraries cstruct-unix sexplib cstruct-sexp)
+ (libraries cstruct-unix sexplib0 cstruct-sexp)
  (preprocess
   (pps ppx_cstruct))
  (package ppx_cstruct))
diff --git a/ppx_test/errors/dune b/ppx_test/errors/dune
index ed51ce0c..c9f58312 100644
--- a/ppx_test/errors/dune
+++ b/ppx_test/errors/dune
@@ -4,7 +4,7 @@
  (preprocess
   (action
    (run %{bin:cppo} -V OCAML:%{ocaml_version} %{input-file})))
- (libraries ppx_cstruct ocaml-migrate-parsetree))
+ (libraries ppx_cstruct ppxlib))
 
 (executable
  (name gen_tests)
diff --git a/ppx_test/with-sexp-of/dune b/ppx_test/with-sexp-of/dune
new file mode 100644
index 00000000..a096fd3f
--- /dev/null
+++ b/ppx_test/with-sexp-of/dune
@@ -0,0 +1,11 @@
+(executable
+ (name ppx_cstruct_and_sexp_of)
+ (preprocess
+  (pps ppx_cstruct ppx_sexp_conv -- -no-check))
+ (libraries cstruct sexplib0 cstruct-sexp))
+
+(rule
+ (alias runtest)
+ (package ppx_cstruct)
+ (action
+  (run ./ppx_cstruct_and_sexp_of.exe)))
diff --git a/ppx_test/with-sexp-of/ppx_cstruct_and_sexp_of.ml b/ppx_test/with-sexp-of/ppx_cstruct_and_sexp_of.ml
new file mode 100644
index 00000000..6539c845
--- /dev/null
+++ b/ppx_test/with-sexp-of/ppx_cstruct_and_sexp_of.ml
@@ -0,0 +1,6 @@
+(* inspect output with [dune describe pp ppx_test/with-sexp-of/ppx_cstruct_and_sexp_of.ml] *)
+[%%cenum
+type enum =
+  | One [@id 1]
+  | Three [@id 3]
+[@@uint8_t][@@sexp_of]]
diff --git a/ppx_test/with-sexp/dune b/ppx_test/with-sexp/dune
index b247296b..b252fc4e 100644
--- a/ppx_test/with-sexp/dune
+++ b/ppx_test/with-sexp/dune
@@ -2,7 +2,7 @@
  (name ppx_cstruct_and_sexp)
  (preprocess
   (pps ppx_cstruct ppx_sexp_conv -- -no-check))
- (libraries cstruct sexplib cstruct-sexp))
+ (libraries cstruct sexplib0 cstruct-sexp))
 
 (rule
  (alias runtest)
diff --git a/ppx_test/with-sexp/ppx_cstruct_and_sexp.ml b/ppx_test/with-sexp/ppx_cstruct_and_sexp.ml
index fb88625e..ba71d7c0 100644
--- a/ppx_test/with-sexp/ppx_cstruct_and_sexp.ml
+++ b/ppx_test/with-sexp/ppx_cstruct_and_sexp.ml
@@ -2,7 +2,7 @@
   magic: uint8_t [@len 16];
 }[@@little_endian]]
 
-open Sexplib.Std
+open Sexplib0.Sexp_conv
 type t = int [@@deriving sexp]
 
 type bar = {