diff --git a/pkgs/development/ocaml-modules/irmin/ppx.nix b/pkgs/development/ocaml-modules/irmin/ppx.nix
index 1d605763ab5..abb21fd7c53 100644
--- a/pkgs/development/ocaml-modules/irmin/ppx.nix
+++ b/pkgs/development/ocaml-modules/irmin/ppx.nix
@@ -2,11 +2,11 @@
 
 buildDunePackage rec {
   pname = "ppx_irmin";
-  version = "2.5.1";
+  version = "2.5.2";
 
   src = fetchurl {
     url = "https://github.com/mirage/irmin/releases/download/${version}/irmin-${version}.tbz";
-    sha256 = "131pcgmpys6danprcbxzf4pdsl0ka74bpmmxz8db4507cvxhsz3n";
+    sha256 = "ac8d75144cafdaf4b5e106b540a27338245510b7e33a8c412d393c9d50cae490";
   };
 
   minimumOCamlVersion = "4.08";