diff --git a/.github/workflows/macos.yml b/.github/workflows/macos.yml
index bae23c67a..21a04a8ed 100644
--- a/.github/workflows/macos.yml
+++ b/.github/workflows/macos.yml
@@ -11,7 +11,7 @@ jobs:
 
       - name: Install dependencies
         run: |
-          brew install meson ninja
+          brew install meson ninja libass
 
       - name: Build Aegisub
         run: |