diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 3ac4b90..bbed35f 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -10,7 +10,7 @@ jobs:
       - name: Update system and add dependencies
         run: |
           apk upgrade -Ua
-          apk add build-base git kyua atf
+          apk add build-base git kyua atf scdoc
 
       - name: Checkout
         uses: actions/checkout@v2