diff --git a/.github/workflows/build-site.yml b/.github/workflows/build-site.yml
index fbae12e..e2acf89 100644
--- a/.github/workflows/build-site.yml
+++ b/.github/workflows/build-site.yml
@@ -28,7 +28,7 @@ jobs:
           npm config set "//npm.fontawesome.com/:_authToken" ${{ secrets.FONTAWESOME_TOKEN }}
       - name: Install global npm packages
         run: |
-          npm -g install
+          npm -g install postcss@8.4.6 postcss-cli@9.1.0 postcss-purgecss@2.0.3
       - name: Install local npm packages
         run: |
           cd assets