diff --git a/repos.json.lock b/repos.json.lock
index 849f88069..29c50d696 100644
--- a/repos.json.lock
+++ b/repos.json.lock
@@ -16,8 +16,8 @@
             "url": "https://github.com/angr/nixpkgs"
         },
         "arc": {
-            "rev": "246b0c3642a1d08ce39e5a71db5cc17309785c1b",
-            "sha256": "09l1ibvd6xbl3rh4pdpyrc1rp9p4520xsgff6nnf1vnpkjqqlzbm",
+            "rev": "b1c63ed08614f8b68de119eb27a7d989dd7d3e65",
+            "sha256": "0vc89wckkppn3nal00pczwlglqfykpgib0xgk63k99801p3dplfs",
             "url": "https://github.com/arcnmx/nixexprs"
         },
         "awl-fcarza": {