diff --git a/repos.json.lock b/repos.json.lock
index f84be2c3f..2c63af284 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": "db7a9d2ebb16e4837d0b10f4a775868f038addb9",
-            "sha256": "06y4ih9i946gmsvc53vkqg0xa38jrr6cwlyvd8pwvm1d8dlmijxm",
+            "rev": "4d61c239df1bf8bcd101ca227384f6f80930d43e",
+            "sha256": "0b707rhn6vwkx1j4kjbyvzvqarj5yrznn2b8h5s8134pmqmj1xx8",
             "url": "https://github.com/arcnmx/nixexprs"
         },
         "balsoft": {