diff --git a/pkgs/development/ocaml-modules/lwt_ssl/default.nix b/pkgs/development/ocaml-modules/lwt_ssl/default.nix
index c33f623529a6..7b74d92c2e50 100644
--- a/pkgs/development/ocaml-modules/lwt_ssl/default.nix
+++ b/pkgs/development/ocaml-modules/lwt_ssl/default.nix
@@ -1,14 +1,14 @@
-{ lib, fetchFromGitHub, buildDunePackage, ssl, lwt }:
+{ lib, fetchurl, buildDunePackage, ssl, lwt }:
 
 buildDunePackage rec {
   pname = "lwt_ssl";
-  version = "1.1.3";
+  version = "1.2.0";
 
-  src = fetchFromGitHub {
-    owner = "aantron";
-    repo = "lwt_ssl";
-    rev = version;
-    sha256 = "sha256-d/jkTI/D2LVi9nrndRGgqg6ca1FcmRKknR7YXyA7gWw=";
+  duneVersion = "3";
+
+  src = fetchurl {
+    url = "https://github.com/ocsigen/lwt_ssl/releases/download/${version}/lwt_ssl-${version}.tbz";
+    hash = "sha256-swIK0nrs83fhw/J0Cgizbcu6mR+EMGZRE1dBBUiImnc=";
   };
 
   propagatedBuildInputs = [ ssl lwt ];
diff --git a/pkgs/development/ocaml-modules/ssl/default.nix b/pkgs/development/ocaml-modules/ssl/default.nix
index 7eca606f93fc..67e841ae1b31 100644
--- a/pkgs/development/ocaml-modules/ssl/default.nix
+++ b/pkgs/development/ocaml-modules/ssl/default.nix
@@ -12,6 +12,8 @@ buildDunePackage rec {
   pname = "ssl";
   version = "0.5.13";
 
+  duneVersion = "3";
+
   src = fetchFromGitHub {
     owner = "savonet";
     repo = "ocaml-ssl";