diff --git a/repos.json.lock b/repos.json.lock
index c8a6f809e..5ad54771c 100644
--- a/repos.json.lock
+++ b/repos.json.lock
@@ -11,8 +11,8 @@
             "url": "https://gricad-gitlab.univ-grenoble-alpes.fr/Projets-INFO4/18-19/19/code"
         },
         "arc": {
-            "rev": "5185b3bb98bc474541e7808fade162bcee5fe473",
-            "sha256": "12p45m04wmbjrl0xgk1jcfw6v7aca7ldskk0d0zs23kzk6kbh4q1",
+            "rev": "2df084fc54291d471dabe7193a6c0771ed16e992",
+            "sha256": "0gpj9dxffkzk2h3m2d4w1zkhgykjaasxfyvmkcma99g3m903614r",
             "url": "https://github.com/arcnmx/nixexprs"
         },
         "bb010g": {