diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 3533bd1ee..fb98bfa0b 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -90,12 +90,14 @@ jobs:
       uses: actions/setup-python@v2
       with:
         python-version: 3
-    - name: Install dependencies
+    - name: Set up Ruby 2.7
+      uses: actions/setup-ruby@v1
+      with:
+        ruby-version: 2.7
+    - name: Install Lua
       run: |
         sudo apt-get update
-        sudo apt-get install \
-          lua5.3 \
-          ruby
+        sudo apt-get install lua5.3
     - name: Clone DFHack
       uses: actions/checkout@v2
       with: