diff --git a/repos.json.lock b/repos.json.lock
index 6456ee9af..15bfbce4e 100644
--- a/repos.json.lock
+++ b/repos.json.lock
@@ -16,8 +16,8 @@
             "url": "https://github.com/angr/nixpkgs"
         },
         "arc": {
-            "rev": "3072dba480d5847b41aeab372e003a57ce275693",
-            "sha256": "1ljy4yqfsbq203m60agf0l58r1vqdvc7nv0dp0ikn74bd70sz456",
+            "rev": "ff673dc7a739e9f4b9026899756d54c19008a8e2",
+            "sha256": "08xp519sxfkrp39ba0inhn0zn7m4lx2anvq0m2wf2hk0vs3hv6rb",
             "url": "https://github.com/arcnmx/nixexprs"
         },
         "awl-fcarza": {