diff --git a/.gitea/workflows/demo.yml b/.gitea/workflows/demo.yml
index a27a2b3..531c250 100644
--- a/.gitea/workflows/demo.yml
+++ b/.gitea/workflows/demo.yml
@@ -25,5 +25,5 @@ jobs:
         run: |
           ls ${{ gitea.workspace }}
       - name: tree
-        run: tree
+        run: sudo apt get update; sudo apt -y install tree; tree
       - run: echo "🍏 This job's status is ${{ job.status }}."
\ No newline at end of file