diff --git a/repos.json.lock b/repos.json.lock
index 49ef20c29..e620747c9 100644
--- a/repos.json.lock
+++ b/repos.json.lock
@@ -16,8 +16,8 @@
             "url": "https://github.com/angr/nixpkgs"
         },
         "arc": {
-            "rev": "c1675efc5d155df06abde6a9f3b05a3a5a4168b0",
-            "sha256": "05cj2lhl4hzlw907m0p3ksixnirmxwv84874vjk6gzv6myxs779i",
+            "rev": "b9004362dc47c04de53c8783cf3155e8d6993696",
+            "sha256": "049z43sgk6mnzbk3i33chlzisycigqxpqysxjzh3b8l5rhgl20wd",
             "url": "https://github.com/arcnmx/nixexprs"
         },
         "awl-fcarza": {