diff --git a/pkgs/development/ocaml-modules/asn1-combinators/default.nix b/pkgs/development/ocaml-modules/asn1-combinators/default.nix
index 2530312bfeac8..81e26af0a8e92 100644
--- a/pkgs/development/ocaml-modules/asn1-combinators/default.nix
+++ b/pkgs/development/ocaml-modules/asn1-combinators/default.nix
@@ -4,28 +4,33 @@
   fetchurl,
   ptime,
   alcotest,
+  ohex,
 }:
 
 buildDunePackage rec {
-  minimalOCamlVersion = "4.08";
+  minimalOCamlVersion = "4.13.0";
 
   pname = "asn1-combinators";
-  version = "0.3.1";
+  version = "0.3.2";
 
   src = fetchurl {
     url = "https://github.com/mirleft/ocaml-asn1-combinators/releases/download/v${version}/asn1-combinators-${version}.tbz";
-    hash = "sha256-+imExupuHhxP4gM/AWWvYRljwkAM4roFEAS3ffxVfE4=";
+    hash = "sha256-KyaYX24nIgc9zZ+ENVvWdX4SZDtaSOMLPAf/fPsNin8=";
   };
 
   propagatedBuildInputs = [ ptime ];
 
   doCheck = true;
-  checkInputs = [ alcotest ];
+  checkInputs = [
+    alcotest
+    ohex
+  ];
 
-  meta = with lib; {
+  meta = {
     homepage = "https://github.com/mirleft/ocaml-asn1-combinators";
+    changelog = "https://github.com/mirleft/ocaml-asn1-combinators/blob/v${version}/CHANGES.md";
     description = "Combinators for expressing ASN.1 grammars in OCaml";
-    license = licenses.isc;
-    maintainers = with maintainers; [ vbgl ];
+    license = lib.licenses.isc;
+    maintainers = with lib.maintainers; [ vbgl ];
   };
 }