diff --git a/repos.json.lock b/repos.json.lock
index d9b8b07fa..deab34ff9 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": "24a9d625db878f1c047bcc5bcbe5c576cf102476",
-            "sha256": "1ycvv3ayda5jz5rjflnhl9p7q5jihfhwssjlwq5ma670kn8vghxa",
+            "rev": "bc6596413f10e1fe8280c8bb7e609baaeea4fe80",
+            "sha256": "164lgpfcx7hmzm0paa0zcjh0qs3zjny6dz91rlrbms2g7s9y8iid",
             "url": "https://github.com/arcnmx/nixexprs"
         },
         "balsoft": {