diff --git a/repos.json.lock b/repos.json.lock
index cf8b55e94..f5f21f393 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": "6c165f31691c5ee8f7f8502fbf70ee9abaafadcc",
-            "sha256": "1sc0ync6gm045zp9i0x5ivgpypj5xmvak8666d9kq6z31q31wi88",
+            "rev": "470a90ce435debab28cb4e2d38d7dbafc0ccb45a",
+            "sha256": "008bfmsx5xjdalz231df4kdz3093052sd6yzvy37drv4ysrz68dw",
             "url": "https://github.com/arcnmx/nixexprs"
         },
         "balsoft": {