diff --git a/pkgs/development/ocaml-modules/coin/default.nix b/pkgs/development/ocaml-modules/coin/default.nix
index 50b309d26f0e..a952f45c5c10 100644
--- a/pkgs/development/ocaml-modules/coin/default.nix
+++ b/pkgs/development/ocaml-modules/coin/default.nix
@@ -1,30 +1,19 @@
 {
   buildDunePackage,
   fetchurl,
-  findlib,
   lib,
-  ocaml,
-  re,
 }:
 
 buildDunePackage (finalAttrs: {
   pname = "coin";
-  version = "0.1.4";
-  minimalOCamlVersion = "4.03";
+  version = "0.1.5";
+  minimalOCamlVersion = "4.06";
 
   src = fetchurl {
     url = "https://github.com/mirage/coin/releases/download/v${finalAttrs.version}/coin-${finalAttrs.version}.tbz";
-    sha256 = "sha256:0069qqswd1ik5ay3d5q1v1pz0ql31kblfsnv0ax0z8jwvacp3ack";
+    hash = "sha256-z2WzQ7zUFmZJTUqygTHguud6+NAcp36WubHbILXGR9g=";
   };
 
-  postPatch = ''
-    substituteInPlace src/dune --replace 'ocaml} ' \
-      'ocaml} -I ${findlib}/lib/ocaml/${ocaml.version}/site-lib '
-  '';
-
-  nativeBuildInputs = [ findlib ];
-  buildInputs = [ re ];
-
   doCheck = true;
 
   meta = {