diff --git a/repos.json.lock b/repos.json.lock
index d08bb71c8..8994f60dc 100644
--- a/repos.json.lock
+++ b/repos.json.lock
@@ -36,8 +36,8 @@
             "url": "https://github.com/angr/nixpkgs"
         },
         "arc": {
-            "rev": "a7c74da71e17b312c74798d663d67341a50512fd",
-            "sha256": "1ypar4jzp4rjzr55cd0l00i54zz3hwrbfijxnsqc0sjb2hjc72pb",
+            "rev": "4812423b80b9b10b46dc999ab8987074a14e8797",
+            "sha256": "1l8nk0ggw6fm1fgjwdg4bzs7vhagak041vxzswjbzcmqww4xyv43",
             "url": "https://github.com/arcnmx/nixexprs"
         },
         "awl-fcarza": {