diff --git a/repos.json.lock b/repos.json.lock
index 0f0aa0a06..d607cf2a3 100644
--- a/repos.json.lock
+++ b/repos.json.lock
@@ -21,8 +21,8 @@
             "url": "https://github.com/angr/nixpkgs"
         },
         "arc": {
-            "rev": "2ec75fc0f2f14ec1797f7b385fee3965472af8e2",
-            "sha256": "1cxi2qksnglcfqwmlrzyzy2g9jg93wkxrcmwsl6brmqd4vczhgz2",
+            "rev": "39a88869fff7f56e63757b62b4837e51651831ad",
+            "sha256": "0i8ddjxbpw58vv137mqkr8las8fcv7s6z9wdrp0pxndb6g685jxj",
             "url": "https://github.com/arcnmx/nixexprs"
         },
         "awl-fcarza": {