diff --git a/repos.json.lock b/repos.json.lock
index ade1317bc..19456c5ec 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": "f8a3785224d02da501c9cbb72386e88f0c40dab1",
-            "sha256": "080cxqbcx34zlwcbh1mss5nnj6j1if9m0pnc8srjphmfh159am7a",
+            "rev": "fd31fdef9684ece111a46ecd85af5b1927c04b83",
+            "sha256": "0jp1x3psiq49dn92l0yv11d5rj9di67lqyma0rfy5f2nnm7zm7zk",
             "url": "https://github.com/arcnmx/nixexprs"
         },
         "balsoft": {