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-rw-r--r--pkgs/development/ocaml-modules/irmin/graphql.nix1
1 files changed, 1 insertions, 0 deletions
diff --git a/pkgs/development/ocaml-modules/irmin/graphql.nix b/pkgs/development/ocaml-modules/irmin/graphql.nix
index 1b5ecb51396fb..005bf25eb2d95 100644
--- a/pkgs/development/ocaml-modules/irmin/graphql.nix
+++ b/pkgs/development/ocaml-modules/irmin/graphql.nix
@@ -7,6 +7,7 @@ buildDunePackage rec {
   pname = "irmin-graphql";
 
   inherit (irmin) version src;
+  duneVersion = "3";
 
   propagatedBuildInputs = [ cohttp-lwt cohttp-lwt-unix graphql-cohttp graphql-lwt irmin git-unix ];