diff --git a/pkgs/development/ocaml-modules/eio/default.nix b/pkgs/development/ocaml-modules/eio/default.nix
index d474d365a113..1f9e18e887e0 100644
--- a/pkgs/development/ocaml-modules/eio/default.nix
+++ b/pkgs/development/ocaml-modules/eio/default.nix
@@ -18,14 +18,14 @@
 
 buildDunePackage rec {
   pname = "eio";
-  version = "0.11";
+  version = "0.12";
 
   minimalOCamlVersion = "5.0";
   duneVersion = "3";
 
   src = fetchurl {
     url = "https://github.com/ocaml-multicore/${pname}/releases/download/v${version}/${pname}-${version}.tbz";
-    sha256 = "DDN0IHRWJjFneIb0/koC+Wcs7JQpf/hcLthU21uqcao=";
+    sha256 = "2EhHzoX/t4ZBSWrSS+PGq1zCxohc7a1q4lfsrFnZJqA=";
   };
 
   propagatedBuildInputs = [