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-rw-r--r--pkgs/development/ocaml-modules/resto/json.nix1
1 files changed, 1 insertions, 0 deletions
diff --git a/pkgs/development/ocaml-modules/resto/json.nix b/pkgs/development/ocaml-modules/resto/json.nix
index dbb81fd35a6..c0f9b00d6ad 100644
--- a/pkgs/development/ocaml-modules/resto/json.nix
+++ b/pkgs/development/ocaml-modules/resto/json.nix
@@ -3,6 +3,7 @@
 buildDunePackage {
   pname = "resto-json";
   inherit (resto) src version meta doCheck;
+  duneVersion = "3";
 
   propagatedBuildInputs = [
     resto