diff --git a/pkgs/development/ocaml-modules/macaddr/default.nix b/pkgs/development/ocaml-modules/macaddr/default.nix
index b413e7570d74..d64ff8054935 100644
--- a/pkgs/development/ocaml-modules/macaddr/default.nix
+++ b/pkgs/development/ocaml-modules/macaddr/default.nix
@@ -9,13 +9,13 @@
 
 buildDunePackage rec {
   pname = "macaddr";
-  version = "5.6.0";
+  version = "5.6.1";
 
   minimalOCamlVersion = "4.04";
 
   src = fetchurl {
     url = "https://github.com/mirage/ocaml-ipaddr/releases/download/v${version}/ipaddr-${version}.tbz";
-    hash = "sha256-njBDP9tMpDemqo/7RHuspeunYV+4jnsM2KS0FsMggTM=";
+    hash = "sha256-HmF9+KvUWEPII+m+dSZ9J0JstXhmHPJWItULJa4Uoxk=";
   };
 
   checkInputs = [