diff --git a/nix/nix/sources.json b/nix/nix/sources.json
index 4456a47d4..bf69a01d3 100644
--- a/nix/nix/sources.json
+++ b/nix/nix/sources.json
@@ -12,15 +12,15 @@
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "opam-nix": {
-        "branch": "master",
+        "branch": "rvem/use-dune_2",
         "description": "A handy nix library to package OCaml software from OPAM repositories",
         "homepage": null,
         "owner": "balsoft",
         "repo": "opam-nix",
-        "rev": "a7b8e16ab28c840eab2c3be2f5069524dc87fd58",
-        "sha256": "0ydbwbirz1ag1lprl2mxz3cvzqxn945yfnakhzm19q2qm78zlb37",
+        "rev": "ba5f7c667aaa4cf5f287ebe03efa5818c9f5902e",
+        "sha256": "1cj5qcyrv67zn3dvkk942dvyikpvl5hcka9wwna9w9xp55szpk42",
         "type": "tarball",
-        "url": "https://github.com/balsoft/opam-nix/archive/a7b8e16ab28c840eab2c3be2f5069524dc87fd58.tar.gz",
+        "url": "https://github.com/balsoft/opam-nix/archive/ba5f7c667aaa4cf5f287ebe03efa5818c9f5902e.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "opam-repository": {