diff --git a/.github/workflows/stack.yml b/.github/workflows/stack.yml
index 172914f..d229f91 100644
--- a/.github/workflows/stack.yml
+++ b/.github/workflows/stack.yml
@@ -28,6 +28,9 @@ jobs:
         enable-stack: true
         stack-version: '2.15.7'
 
+    - name: Update hackage index
+      run: cabal update --ignore-project
+
     - name: Install Dhall
       uses: dhall-lang/setup-dhall@v4
       with: