diff --git a/repos.json.lock b/repos.json.lock
index bf6ac6001..ed849ef42 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": "281d6676b1a27fdf4a3f9aefdc74743d5304fd07",
-            "sha256": "1y5g8llrfl5wvdz9yh6dk9i1psyn6hac7sv47f4l346zb0fz3q04",
+            "rev": "9fdf4b0a16f25e42b686b5fcd0a26b898897eb50",
+            "sha256": "06v8g9mlp51c366y8hhh6xrsk9km93p15zvpi3kqh9ih21i18b6g",
             "url": "https://github.com/arcnmx/nixexprs"
         },
         "balsoft": {