diff --git a/repos.json.lock b/repos.json.lock
index f6d3bf67c..658f75809 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": "eb42fd1f6b45e993212e8dc92f94c550df852cd6",
-            "sha256": "0036i5s9qf1x7vx99x3j3hzrfb0ypa4b375nylsw6c899sfpqqs5",
+            "rev": "69b1080e80edb321e9590bfda16de75a9378a4a8",
+            "sha256": "1i2klrgxi176fcpkdlyn3wfkzlxr4sckmm6kr7m7yamsnxb22yh4",
             "url": "https://github.com/arcnmx/nixexprs"
         },
         "balsoft": {