diff --git a/pkgs/development/ocaml-modules/prometheus/default.nix b/pkgs/development/ocaml-modules/prometheus/default.nix
index 859043639858..bee4f05b8d0d 100644
--- a/pkgs/development/ocaml-modules/prometheus/default.nix
+++ b/pkgs/development/ocaml-modules/prometheus/default.nix
@@ -4,35 +4,32 @@
   buildDunePackage,
   astring,
   asetmap,
-  fmt,
   re,
   lwt,
   alcotest,
 }:
 
-buildDunePackage rec {
+buildDunePackage (finalAttrs: {
   pname = "prometheus";
-  version = "1.2";
+  version = "1.3";
 
   src = fetchurl {
-    url = "https://github.com/mirage/prometheus/releases/download/v${version}/prometheus-${version}.tbz";
-    sha256 = "sha256-g2Q6ApprbecdFANO7i6U/v8dCHVcSkHVg9wVMKtVW8s=";
+    url = "https://github.com/mirage/prometheus/releases/download/v${finalAttrs.version}/prometheus-${finalAttrs.version}.tbz";
+    hash = "sha256-4C0UzwaCgqtk5SGIY89rg0dxdrKm63lhdcOaQAa20L8=";
   };
 
-  duneVersion = "3";
-
   propagatedBuildInputs = [
     astring
     asetmap
-    fmt
     re
     lwt
-    alcotest
   ];
 
   meta = {
+    homepage = "https://github.com/mirage/prometheus";
     description = "Client library for Prometheus monitoring";
     license = lib.licenses.asl20;
     maintainers = [ lib.maintainers.ulrikstrid ];
+    changelog = "https://raw.githubusercontent.com/mirage/prometheus/v${finalAttrs.version}/CHANGES.md";
   };
-}
+})