diff --git a/.github/workflows/pkgdown.yaml b/.github/workflows/pkgdown.yaml
index bfc9f4d..f7db1b5 100644
--- a/.github/workflows/pkgdown.yaml
+++ b/.github/workflows/pkgdown.yaml
@@ -30,6 +30,7 @@ jobs:
       - uses: r-lib/actions/setup-r@v2
         with:
           use-public-rspm: true
+          extra-repositories: "https://pik-piam.r-universe.dev"
 
       - uses: r-lib/actions/setup-r-dependencies@v2
         with: