diff --git a/pkgs/development/ocaml-modules/mirage-flow/combinators.nix b/pkgs/development/ocaml-modules/mirage-flow/combinators.nix
index d4904e77430..5500d055125 100644
--- a/pkgs/development/ocaml-modules/mirage-flow/combinators.nix
+++ b/pkgs/development/ocaml-modules/mirage-flow/combinators.nix
@@ -1,11 +1,13 @@
-{ buildDunePackage, mirage-flow, fmt, ocaml_lwt, logs, cstruct, mirage-clock }:
+{ buildDunePackage, mirage-flow, fmt, lwt, logs, cstruct, mirage-clock }:
 
 buildDunePackage {
   pname = "mirage-flow-combinators";
 
-  inherit (mirage-flow) version useDune2 src;
+  inherit (mirage-flow) version src;
 
-  propagatedBuildInputs = [ ocaml_lwt logs cstruct mirage-clock mirage-flow ];
+  duneVersion = "3";
+
+  propagatedBuildInputs = [ lwt logs cstruct mirage-clock mirage-flow ];
 
   meta = mirage-flow.meta // {
     description = "Flow implementations and combinators for MirageOS specialized to lwt";
diff --git a/pkgs/development/ocaml-modules/mirage-flow/default.nix b/pkgs/development/ocaml-modules/mirage-flow/default.nix
index bc987eff988..6b454512915 100644
--- a/pkgs/development/ocaml-modules/mirage-flow/default.nix
+++ b/pkgs/development/ocaml-modules/mirage-flow/default.nix
@@ -1,18 +1,18 @@
-{ lib, buildDunePackage, fetchurl, cstruct, fmt, ocaml_lwt }:
+{ lib, buildDunePackage, fetchurl, cstruct, fmt, lwt }:
 
 buildDunePackage rec {
   pname = "mirage-flow";
   version = "3.0.0";
 
-  useDune2 = true;
-  minimumOCamlVersion = "4.05";
+  duneVersion = "3";
+  minimalOCamlVersion = "4.05";
 
   src = fetchurl {
     url = "https://github.com/mirage/mirage-flow/releases/download/v${version}/mirage-flow-v${version}.tbz";
-    sha256 = "sha256-1wvabIXsJ0e+2IvE2V8mnSgQUDuSkT8IB75SkWlhOPw=";
+    hash = "sha256-1wvabIXsJ0e+2IvE2V8mnSgQUDuSkT8IB75SkWlhOPw=";
   };
 
-  propagatedBuildInputs = [ cstruct fmt ocaml_lwt ];
+  propagatedBuildInputs = [ cstruct fmt lwt ];
 
   meta = {
     description = "Flow implementations and combinators for MirageOS";
diff --git a/pkgs/development/ocaml-modules/mirage-flow/unix.nix b/pkgs/development/ocaml-modules/mirage-flow/unix.nix
index 023896447db..12681911a3d 100644
--- a/pkgs/development/ocaml-modules/mirage-flow/unix.nix
+++ b/pkgs/development/ocaml-modules/mirage-flow/unix.nix
@@ -5,7 +5,9 @@
 buildDunePackage {
   pname = "mirage-flow-unix";
 
-  inherit (mirage-flow) version useDune2 src;
+  inherit (mirage-flow) version src;
+
+  duneVersion = "3";
 
   # Make tests compatible with alcotest 1.4.0
   postPatch = ''