diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index 6227ee61..03165bdf 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -8,6 +8,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2.3.4
+    - name: Unshallow
+      run: git fetch --prune --unshallow
     - uses: serras/setup-stack@v3
     - uses: actions/cache@v2.1.3
       name: Cache ~/.stack