diff --git a/pkgs/development/ocaml-modules/dolog/default.nix b/pkgs/development/ocaml-modules/dolog/default.nix
index ceb028e0712..898c2b67fd6 100644
--- a/pkgs/development/ocaml-modules/dolog/default.nix
+++ b/pkgs/development/ocaml-modules/dolog/default.nix
@@ -1,12 +1,12 @@
 { stdenv, fetchzip, ocaml, findlib }:
 
-let version = "1.1"; in
+let version = "3.0"; in
 
 stdenv.mkDerivation {
   name = "ocaml-dolog-${version}";
   src = fetchzip {
     url = "https://github.com/UnixJunkie/dolog/archive/v${version}.tar.gz";
-    sha256 = "093lmprb1v2ran3pyymcdq80xnsgdz7h76g764xsy97dba5ik40n";
+    sha256 = "0gx2s4509vkkkaikl2yp7k5x7bqv45s1y1vsy408d8rakd7yl1zb";
   };
 
   buildInputs = [ ocaml findlib ];