diff --git a/flake.lock b/flake.lock
--- a/flake.lock
+++ b/flake.lock
@@ -2,11 +2,11 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1651114127,
-        "narHash": "sha256-/lLC0wkMZkAdA5e1W76SnJzbhfOGDvync3VRHJMtAKk=",
+        "lastModified": 1655481042,
+        "narHash": "sha256-XHbcywq2vIQ5CeH1OK3TN793jkiNAAZsSctS1PFgseo=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "6766fb6503ae1ebebc2a9704c162b2aef351f921",
+        "rev": "103a4c0ae46afa9cf008c30744175315ca38e9f9",
         "type": "github"
       },
       "original": {
diff --git a/nix/overlay.nix b/nix/overlay.nix
--- a/nix/overlay.nix
+++ b/nix/overlay.nix
@@ -20,4 +20,10 @@
   mysql-down = prev.callPackage ./mysql-down-linux.nix { };
 
   mysql-up = prev.callPackage ./mysql-up-linux.nix { };
+
+  arcanist = prev.arcanist.override(_: {
+    # php8.1 will cause warnings to throw as exceptions
+    # around calling strlen() with null
+    php = prev.php80;
+  });
 }