diff --git a/build.zig.zon b/build.zig.zon
index b053db0..b7278e4 100644
--- a/build.zig.zon
+++ b/build.zig.zon
@@ -5,8 +5,8 @@
     .minimum_zig_version = "0.16.0",
     .dependencies = .{
         .zat = .{
-            .url = "https://tangled.org/zat.dev/zat/archive/v0.3.0-alpha.17.tar.gz",
-            .hash = "zat-0.3.0-alpha.15-5PuC7nVhBQBnyDEw50Zwitd8ujG7mJumQlVtqYh08QML",
+            .url = "https://tangled.org/zat.dev/zat/archive/v0.3.0-alpha.21.tar.gz",
+            .hash = "zat-0.3.0-alpha.21-5PuC7p9OCACUy2OKM0eM36VaDcxQgAwXKUpHbgiAyyLp",
         },
         .websocket = .{
             .url = "https://github.com/zzstoatzz/websocket.zig/archive/9ac64da.tar.gz",