diff --git a/repos.json.lock b/repos.json.lock
index fdcbde23e..8e899da79 100644
--- a/repos.json.lock
+++ b/repos.json.lock
@@ -46,8 +46,8 @@
             "url": "https://github.com/angr/nixpkgs"
         },
         "arc": {
-            "rev": "c294222dc0cfeb77fc1ee281e21121581b831e08",
-            "sha256": "06z5ql2sfwh4526pgwnx93firyaaa4l2xsqxivkm2diyhmr1jm65",
+            "rev": "5bf9fb9e07b6dfefd0134c57db667c7c75ed0119",
+            "sha256": "0pvz1swflmyyyzx5yzfflr1llsfw38pax03vac83pc8y0r78f84h",
             "url": "https://github.com/arcnmx/nixexprs"
         },
         "artturin": {