diff --git a/pkgs/development/ocaml-modules/pbkdf/default.nix b/pkgs/development/ocaml-modules/pbkdf/default.nix
index 1ecf213f6d3..d82869c4392 100644
--- a/pkgs/development/ocaml-modules/pbkdf/default.nix
+++ b/pkgs/development/ocaml-modules/pbkdf/default.nix
@@ -1,22 +1,23 @@
 { lib
 , buildDunePackage
-, fetchurl
+, fetchFromGitHub
+, cstruct
 , mirage-crypto
 , alcotest
 }:
 
 buildDunePackage rec {
   pname = "pbkdf";
-  version = "1.1.0";
+  version = "1.2.0";
 
-  useDune2 = true;
-
-  src = fetchurl {
-    url = "https://github.com/abeaumont/ocaml-pbkdf/releases/download/${version}/pbkdf-${version}.tbz";
-    sha256 = "e53ed1bd9abf490c858a341c10fb548bc9ad50d4479acdf95a9358a73d042264";
+  src = fetchFromGitHub {
+    owner = "abeaumont";
+    repo = "ocaml-pbkdf";
+    rev = version;
+    sha256 = "sha256-dGi4Vw+7VBpK/NpJ6zdpogm+E6G/oJovXCksJBSmqjI=";
   };
 
-  propagatedBuildInputs = [ mirage-crypto ];
+  propagatedBuildInputs = [ cstruct mirage-crypto ];
   checkInputs = [ alcotest ];
   doCheck = true;