diff --git a/pkgs/development/ocaml-modules/earlybird/default.nix b/pkgs/development/ocaml-modules/earlybird/default.nix
index 209bf30d2a61..9803a20368c3 100644
--- a/pkgs/development/ocaml-modules/earlybird/default.nix
+++ b/pkgs/development/ocaml-modules/earlybird/default.nix
@@ -1,30 +1,38 @@
 { lib, fetchFromGitHub, ocaml, buildDunePackage
 , cmdliner, dap, fmt, iter, logs, lru, lwt_ppx, lwt_react, menhir, menhirLib, path_glob, ppx_deriving_yojson
+, ppx_optcomp
 , gitUpdater
 }:
 
-if lib.versionAtLeast ocaml.version "4.13"
-then throw "earlybird is not available for OCaml ${ocaml.version}"
-else
-
 buildDunePackage rec {
   pname = "earlybird";
-  version = "1.1.0";
+  version = "1.2.1";
 
-  duneVersion = "3";
-
-  minimalOCamlVersion = "4.11";
+  minimalOCamlVersion = "4.12";
 
   src = fetchFromGitHub {
     owner = "hackwaly";
     repo = "ocamlearlybird";
     rev = version;
-    hash = "sha256-8JHZWsgpz2pzpDxST3bkMSmPHtj7MDzD5G3ujqMW+MU=";
+    hash = "sha256-p29uTdx8+mZKXUL+ng/FzpKuhnykEe8Sy968Wa/KUn4=";
   };
 
   nativeBuildInputs = [ menhir ];
 
-  buildInputs = [ cmdliner dap fmt iter logs lru lwt_ppx lwt_react menhirLib path_glob ppx_deriving_yojson ];
+  buildInputs = [
+    cmdliner
+    dap
+    fmt
+    iter
+    logs
+    lru
+    lwt_ppx
+    lwt_react
+    menhirLib
+    path_glob
+    ppx_deriving_yojson
+    ppx_optcomp
+  ];
 
   passthru.updateScript = gitUpdater { };