diff --git a/pkgs/development/ocaml-modules/magic-trace/default.nix b/pkgs/development/ocaml-modules/magic-trace/default.nix
index 39bdca1119a4..8fdd92f81329 100644
--- a/pkgs/development/ocaml-modules/magic-trace/default.nix
+++ b/pkgs/development/ocaml-modules/magic-trace/default.nix
@@ -1,21 +1,49 @@
-{ lib, fetchFromGitHub, buildDunePackage, async, cohttp_static_handler ? null
-, core_unix ? null, owee, ppx_jane, shell ? null }:
+{ lib
+, fetchFromGitHub
+, buildDunePackage
+, ocaml-crunch
+, angstrom
+, async
+, cohttp
+, cohttp_static_handler ? null
+, core
+, core_unix ? null
+, fzf
+, owee
+, ppx_jane
+, re
+, shell ? null
+}:
 
 buildDunePackage rec {
   pname = "magic-trace";
-  version = "1.1.0";
+  version = "1.2.1";
 
   minimalOCamlVersion = "4.12";
-  duneVersion = "3";
 
   src = fetchFromGitHub {
     owner = "janestreet";
     repo = "magic-trace";
     rev = "v${version}";
-    sha256 = "sha256-615AOkrbQI6vRosA5Kz3Epipe9f9+Gs9+g3bVl5gzBY=";
+    hash = "sha256-/9TDjCG/06mhGyqbjAdUmk6fcaq9fNDqVSw51w5EEy4=";
   };
 
-  buildInputs = [ async cohttp_static_handler core_unix owee ppx_jane shell ];
+  nativeBuildInputs = [
+    ocaml-crunch
+  ];
+  buildInputs = [
+    angstrom
+    async
+    cohttp
+    cohttp_static_handler
+    core
+    core_unix
+    fzf
+    owee
+    ppx_jane
+    re
+    shell
+  ];
 
   meta = with lib; {
     description =
diff --git a/pkgs/top-level/ocaml-packages.nix b/pkgs/top-level/ocaml-packages.nix
index f9f1bc765850..354e3a4e6d64 100644
--- a/pkgs/top-level/ocaml-packages.nix
+++ b/pkgs/top-level/ocaml-packages.nix
@@ -824,8 +824,6 @@ let
         cfstream = self.cfstream.override { inherit core_kernel; };
       };
 
-      magic-trace = callPackage ../development/ocaml-modules/magic-trace { };
-
       phylogenetics = let
         angstrom = self.angstrom.override { inherit ppx_let; };
       in callPackage ../development/ocaml-modules/phylogenetics {
@@ -1022,7 +1020,7 @@ let
 
     magic-mime = callPackage ../development/ocaml-modules/magic-mime { };
 
-    magic-trace = janeStreet_0_15.magic-trace;
+    magic-trace = callPackage ../development/ocaml-modules/magic-trace { };
 
     mariadb = callPackage ../development/ocaml-modules/mariadb {
       inherit (pkgs) mariadb;