diff --git a/pkgs/development/ocaml-modules/atdgen/codec-runtime.nix b/pkgs/development/ocaml-modules/atdgen/codec-runtime.nix
index 6dce840e914c..ab1e82df1e99 100644
--- a/pkgs/development/ocaml-modules/atdgen/codec-runtime.nix
+++ b/pkgs/development/ocaml-modules/atdgen/codec-runtime.nix
@@ -2,11 +2,13 @@
 
 buildDunePackage rec {
   pname = "atdgen-codec-runtime";
-  version = "2.10.0";
+  version = "2.11.0";
+
+  duneVersion = "3";
 
   src = fetchurl {
     url = "https://github.com/ahrefs/atd/releases/download/${version}/atdts-${version}.tbz";
-    sha256 = "sha256-d9J0CaTp2sQbnKLp6mCDbGwYAIsioVer7ftaLSSFCZg=";
+    hash = "sha256-TTTuSxNKydPmTmztUapLoxntBIrAo8aWYIJ/G5cok1Y=";
   };
 
   meta = {
diff --git a/pkgs/development/ocaml-modules/atdgen/default.nix b/pkgs/development/ocaml-modules/atdgen/default.nix
index 07ee079cae30..60bca80fa6f4 100644
--- a/pkgs/development/ocaml-modules/atdgen/default.nix
+++ b/pkgs/development/ocaml-modules/atdgen/default.nix
@@ -6,6 +6,8 @@ buildDunePackage {
   pname = "atdgen";
   inherit (atdgen-codec-runtime) version src;
 
+  duneVersion = "3";
+
   buildInputs = [ atd re ];
 
   propagatedBuildInputs = [ atdgen-runtime ];
diff --git a/pkgs/development/ocaml-modules/atdgen/runtime.nix b/pkgs/development/ocaml-modules/atdgen/runtime.nix
index 0006e8613c58..c70d3752cdef 100644
--- a/pkgs/development/ocaml-modules/atdgen/runtime.nix
+++ b/pkgs/development/ocaml-modules/atdgen/runtime.nix
@@ -5,6 +5,7 @@ buildDunePackage rec {
   inherit (atdgen-codec-runtime) version src;
 
   minimalOCamlVersion = "4.08";
+  duneVersion = "3";
 
   propagatedBuildInputs = [ biniou yojson ];
 
diff --git a/pkgs/development/ocaml-modules/elpi/default.nix b/pkgs/development/ocaml-modules/elpi/default.nix
index e921ffd06456..4467ce3de8cd 100644
--- a/pkgs/development/ocaml-modules/elpi/default.nix
+++ b/pkgs/development/ocaml-modules/elpi/default.nix
@@ -35,6 +35,7 @@ buildDunePackage rec {
     ./atd_2_10.patch;
 
   minimalOCamlVersion = "4.04";
+  duneVersion = "3";
 
   # atdgen is both a library and executable
   nativeBuildInputs = [ perl ]