diff --git a/repos.json.lock b/repos.json.lock
index 273a1342e..67afc8d75 100644
--- a/repos.json.lock
+++ b/repos.json.lock
@@ -46,8 +46,8 @@
             "url": "https://github.com/angr/nixpkgs"
         },
         "arc": {
-            "rev": "281df8466c07ffb0cb6e4e8582f0b84ccd501ec6",
-            "sha256": "0pnwas0zx1rar0gxjvk5f7d3skws74maib01mzlygzhgfi6njgpv",
+            "rev": "a9f51606b0b30855c5e76703b18aba88b0cc85ae",
+            "sha256": "16bp6i64yf5zwjfjvzi0vpgsf4n210r115smrnzwhm1m05pm67ja",
             "url": "https://github.com/arcnmx/nixexprs"
         },
         "artturin": {