diff --git a/treefmt.toml b/treefmt.toml
index 04bdf00a..7c0f8514 100644
--- a/treefmt.toml
+++ b/treefmt.toml
@@ -1,7 +1,7 @@
-[formatter.crystal]
-command = "crystal"
-options = ["tool", "format"]
-includes = [ "*.cr" ]
+[formatter.deno]
+command = "deno"
+options = ["fmt"]
+includes = [ "*.ts" ]
 
 [formatter.nix]
 command = "nixpkgs-fmt"