diff --git a/repos.json.lock b/repos.json.lock
index 200834349..7a499f7fc 100644
--- a/repos.json.lock
+++ b/repos.json.lock
@@ -36,8 +36,8 @@
             "url": "https://github.com/angr/nixpkgs"
         },
         "arc": {
-            "rev": "824afa36a052e92fc0cba99c7cde9af7694cb7bd",
-            "sha256": "0y9f6h3pisjw6dx8ljmzk5r1rwnf98d0kkacflcm7swa4s187jsz",
+            "rev": "78009dd7742a4cfef92aafafe17d132b74387612",
+            "sha256": "08ps6fs5098m7dbbkxi4xhhvzhcgxpfjhv8rnnyjh710r68gnkh7",
             "url": "https://github.com/arcnmx/nixexprs"
         },
         "awl-fcarza": {