diff --git a/repos.json.lock b/repos.json.lock
index fa0d952fb..a0335e712 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": "cf9b43e4d718054b6fee79483dd39babb871b729",
-            "sha256": "1y4b8d00vagsl4y0fw4wsymn2pv743mh30i7g376y6zla7jjiigk",
+            "rev": "63f0d65fba9c6364e827e6f9612bdac7b8a49d62",
+            "sha256": "1q8lr7zw1wdsq7rxna63s47cpayzky6bdqlfkvzhghn5709qsc18",
             "url": "https://github.com/arcnmx/nixexprs"
         },
         "awl-fcarza": {