diff --git a/repos.json.lock b/repos.json.lock
index 9fc0581e9..2882f0d7b 100644
--- a/repos.json.lock
+++ b/repos.json.lock
@@ -11,8 +11,8 @@
             "url": "https://gricad-gitlab.univ-grenoble-alpes.fr/Projets-INFO4/18-19/19/code"
         },
         "arc": {
-            "rev": "2b215560e7612591d16958afe00a122b0d038672",
-            "sha256": "1b266sfh0c2ihj49bqqar4vdyxbpg2k6c2vfgbvi9bzyw9p3cj7b",
+            "rev": "20da38abe4351cfcb53e78f666a927a1b4aa266c",
+            "sha256": "1ifkmyr9c1mybf5kly4avglxknjwkj6mfbwrvc59fh7jqd1ksnhy",
             "url": "https://github.com/arcnmx/nixexprs"
         },
         "balsoft": {