diff --git a/repos.json.lock b/repos.json.lock
index a329971b4..bd0df40c9 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": "e3a7ca857730c255a5e06675f256d05a69454186",
-            "sha256": "18m02wa1235an8x5ffvg77mv1cfmijbmz63yp7z642b5wqb57y7f",
+            "rev": "f4aaf960984a4ad2eea2fc8553ec5501cdf36005",
+            "sha256": "1pxxhw8r14vpcfqyr9649ljgigngww80g0brnri5nasjgf1zk1m1",
             "url": "https://github.com/arcnmx/nixexprs"
         },
         "balsoft": {