diff --git a/pkgs/development/ocaml-modules/mirage-net-xen/default.nix b/pkgs/development/ocaml-modules/mirage-net-xen/default.nix
index 49a00747cfa..e03e17905fa 100644
--- a/pkgs/development/ocaml-modules/mirage-net-xen/default.nix
+++ b/pkgs/development/ocaml-modules/mirage-net-xen/default.nix
@@ -20,6 +20,8 @@ buildDunePackage {
     meta
     ;
 
+  duneVersion = "3";
+
   nativeBuildInputs = [
     ppx_sexp_conv
   ];
diff --git a/pkgs/development/ocaml-modules/netchannel/default.nix b/pkgs/development/ocaml-modules/netchannel/default.nix
index ce859d366b0..8b0dbec3927 100644
--- a/pkgs/development/ocaml-modules/netchannel/default.nix
+++ b/pkgs/development/ocaml-modules/netchannel/default.nix
@@ -19,13 +19,14 @@
 
 buildDunePackage rec {
   pname = "netchannel";
-  version = "2.1.1";
+  version = "2.1.2";
 
   minimalOCamlVersion = "4.08";
+  duneVersion = "3";
 
   src = fetchurl {
     url = "https://github.com/mirage/mirage-net-xen/releases/download/v${version}/mirage-net-xen-${version}.tbz";
-    sha256 = "sha256-kYsAf6ntwWKUp26dMcp5BScdUOaGpM46050jVZe6gfs=";
+    hash = "sha256-lTmwcNKiaq5EdJdM4UaaAVdZ+hTCX5U9MPKY/r3i7fw=";
   };
 
   buildInputs = [