diff --git a/.tangled/workflows/deploy.yml b/.tangled/workflows/deploy.yml
index b6fa941..2097688 100644
--- a/.tangled/workflows/deploy.yml
+++ b/.tangled/workflows/deploy.yml
@@ -7,6 +7,7 @@ engine: "nixery"
 dependencies:
   nixpkgs:
     - nodejs_24
+    - lilypond
 
 steps:
   - name: "install dependencies"