diff --git a/.github/workflows/documentation.yml b/.github/workflows/documentation.yml
index 1d9df4f5..a9b74659 100644
--- a/.github/workflows/documentation.yml
+++ b/.github/workflows/documentation.yml
@@ -16,6 +16,7 @@ jobs:
         ghc-version: '9.2.1'
     - name: Generate documentation
       run: |
+       cabal install --lib async
        haddock --source-module=$GITHUB_SERVER_URL/$GITHUB_REPOSITORY/tree/$GITHUB_SHA/%{FILE} \
                --source-entity=$GITHUB_SERVER_URL/$GITHUB_REPOSITORY/tree/$GITHUB_SHA/%{FILE}#L%{LINE} \
                --title=blarney \