diff --git a/nixpacks.toml b/nixpacks.toml
index 7a98ab3..fea2eea 100644
--- a/nixpacks.toml
+++ b/nixpacks.toml
@@ -2,4 +2,4 @@
 aptPkgs = ["...", "build-essential"]
 
 [phases.build]
-cmds = ["mix compile", "mix ecto.setup", "pushd assets && npm install && popd"]
+cmds = ["mix compile", "mix ecto.setup", "pushd assets && yarn install && popd"]