diff --git a/pkgs/development/ocaml-modules/shared-memory-ring/default.nix b/pkgs/development/ocaml-modules/shared-memory-ring/default.nix
index 17dee792007b..331eff1c1027 100644
--- a/pkgs/development/ocaml-modules/shared-memory-ring/default.nix
+++ b/pkgs/development/ocaml-modules/shared-memory-ring/default.nix
@@ -9,13 +9,13 @@
 
 buildDunePackage rec {
   pname = "shared-memory-ring";
-  version = "3.1.1";
+  version = "3.2.1";
 
   duneVersion = "3";
 
   src = fetchurl {
     url = "https://github.com/mirage/shared-memory-ring/releases/download/v${version}/shared-memory-ring-${version}.tbz";
-    hash = "sha256-KW8grij/OAnFkdUdRRZF21X39DvqayzkTWeRKwF8uoU=";
+    hash = "sha256-qSdntsPQo0/8JlbOoO6NAYtoa86HJy5yWHUsWi/PGDM=";
   };
 
   buildInputs = [