diff --git a/pkgs/development/ocaml-modules/lablgtk3/default.nix b/pkgs/development/ocaml-modules/lablgtk3/default.nix
index e8e890bd85a..9f2227327e4 100644
--- a/pkgs/development/ocaml-modules/lablgtk3/default.nix
+++ b/pkgs/development/ocaml-modules/lablgtk3/default.nix
@@ -1,15 +1,15 @@
 { stdenv, fetchurl, pkgconfig, ocaml, findlib, gtk3, gtkspell3, gtksourceview }:
 
-if !stdenv.lib.versionAtLeast ocaml.version "4.03"
+if !stdenv.lib.versionAtLeast ocaml.version "4.05"
 then throw "lablgtk3 is not available for OCaml ${ocaml.version}"
 else
 
 stdenv.mkDerivation rec {
-  version = "3.0.beta2";
+  version = "3.0.beta3";
   name = "ocaml${ocaml.version}-lablgtk3-${version}";
   src = fetchurl {
-    url = https://forge.ocamlcore.org/frs/download.php/1774/lablgtk-3.0.beta2.tar.gz;
-    sha256 = "1v4qj07l75hqis4j9bx8x1cfn7scqi6nmp4j5jx41x94ws7hp2ch";
+    url = https://forge.ocamlcore.org/frs/download.php/1775/lablgtk-3.0.beta3.tar.gz;
+    sha256 = "174mwwdz1s91a6ycbas7nc0g87c2l6zqv68zi5ab33yb76l46a6w";
   };
 
   nativeBuildInputs = [ pkgconfig ];