diff --git a/pkgs/development/ocaml-modules/eio/default.nix b/pkgs/development/ocaml-modules/eio/default.nix
index 1f9e18e887e0..005364039e02 100644
--- a/pkgs/development/ocaml-modules/eio/default.nix
+++ b/pkgs/development/ocaml-modules/eio/default.nix
@@ -1,4 +1,6 @@
 { lib
+, ocaml
+, version ? if lib.versionAtLeast ocaml.version "5.1" then "0.13" else "0.12"
 , buildDunePackage
 , bigstringaf
 , cstruct
@@ -16,16 +18,26 @@
 , mdx
 }:
 
+let
+  param = {
+    "0.12" = {
+      minimalOCamlVersion = "5.0";
+      hash = "sha256-2EhHzoX/t4ZBSWrSS+PGq1zCxohc7a1q4lfsrFnZJqA=";
+    };
+    "0.13" = {
+      minimalOCamlVersion = "5.1";
+      hash = "sha256-glN+4cWxgp/eggdhSk459WC9WCMyhBKQ7V73ZpHzr3A=";
+    };
+  }."${version}";
+in
 buildDunePackage rec {
   pname = "eio";
-  version = "0.12";
-
-  minimalOCamlVersion = "5.0";
-  duneVersion = "3";
+  inherit version;
+  inherit (param) minimalOCamlVersion;
 
   src = fetchurl {
     url = "https://github.com/ocaml-multicore/${pname}/releases/download/v${version}/${pname}-${version}.tbz";
-    sha256 = "2EhHzoX/t4ZBSWrSS+PGq1zCxohc7a1q4lfsrFnZJqA=";
+    inherit (param) hash;
   };
 
   propagatedBuildInputs = [
diff --git a/pkgs/development/ocaml-modules/eio/linux.nix b/pkgs/development/ocaml-modules/eio/linux.nix
index 62f9800790b5..b376f709794a 100644
--- a/pkgs/development/ocaml-modules/eio/linux.nix
+++ b/pkgs/development/ocaml-modules/eio/linux.nix
@@ -10,7 +10,6 @@ buildDunePackage {
   inherit (eio) meta src version;
 
   minimalOCamlVersion = "5.0";
-  duneVersion = "3";
 
   dontStrip = true;
 
diff --git a/pkgs/development/ocaml-modules/eio/main.nix b/pkgs/development/ocaml-modules/eio/main.nix
index def30f2a0597..410e53551275 100644
--- a/pkgs/development/ocaml-modules/eio/main.nix
+++ b/pkgs/development/ocaml-modules/eio/main.nix
@@ -11,7 +11,6 @@ buildDunePackage {
   inherit (eio) meta src version;
 
   minimalOCamlVersion = "5.0";
-  duneVersion = "3";
 
   dontStrip = true;
 
diff --git a/pkgs/development/ocaml-modules/eio/posix.nix b/pkgs/development/ocaml-modules/eio/posix.nix
index 6c3042e65fae..e8dc4072bab1 100644
--- a/pkgs/development/ocaml-modules/eio/posix.nix
+++ b/pkgs/development/ocaml-modules/eio/posix.nix
@@ -11,7 +11,6 @@ buildDunePackage {
   inherit (eio) meta src version;
 
   minimalOCamlVersion = "5.0";
-  duneVersion = "3";
 
   dontStrip = true;