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-rw-r--r--pkgs/development/ocaml-modules/irmin/git.nix1
1 files changed, 1 insertions, 0 deletions
diff --git a/pkgs/development/ocaml-modules/irmin/git.nix b/pkgs/development/ocaml-modules/irmin/git.nix
index 387fc60a0aa9b..c489281591304 100644
--- a/pkgs/development/ocaml-modules/irmin/git.nix
+++ b/pkgs/development/ocaml-modules/irmin/git.nix
@@ -10,6 +10,7 @@ buildDunePackage {
   pname = "irmin-git";
 
   inherit (irmin) version src strictDeps;
+  duneVersion = "3";
 
   propagatedBuildInputs = [
     git