diff --git a/pkgs/development/ocaml-modules/brisk-reconciler/default.nix b/pkgs/development/ocaml-modules/brisk-reconciler/default.nix
index 91c9efc90e8f..d99e050d7642 100644
--- a/pkgs/development/ocaml-modules/brisk-reconciler/default.nix
+++ b/pkgs/development/ocaml-modules/brisk-reconciler/default.nix
@@ -4,23 +4,28 @@
   lib,
   reason,
   ppxlib,
+  ocaml,
 }:
 
+let
+  version =
+    if lib.versionAtLeast ocaml.version "5.3" then
+      throw "brisk-reconciler is not available for OCaml ${ocaml.version}"
+    else
+      "1.0.0-alpha1";
+in
+
 buildDunePackage {
   pname = "brisk-reconciler";
-  version = "unstable-2020-12-02";
-
-  duneVersion = "3";
+  inherit version;
 
   src = fetchFromGitHub {
     owner = "briskml";
     repo = "brisk-reconciler";
-    rev = "c9d5c4cf5dd17ff2da994de2c3b0f34c72778f70";
-    sha256 = "sha256-AAB4ZzBnwfwFXOAqX/sIT6imOl70F0YNMt96SWOOE9w=";
+    tag = "v${version}";
+    hash = "sha256-Xj6GGsod3lnEEjrzPrlHwQAowq66uz8comlhpWK888k=";
   };
 
-  nativeBuildInputs = [ reason ];
-
   buildInputs = [
     ppxlib
   ];