diff --git a/.github/workflows/firebase-hosting-merge.yml b/.github/workflows/firebase-hosting-merge.yml
index 0300703..02f2c86 100644
--- a/.github/workflows/firebase-hosting-merge.yml
+++ b/.github/workflows/firebase-hosting-merge.yml
@@ -12,6 +12,9 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v2
+        with:
+          submodules: true  # Fetch Hugo themes (true OR recursive)
+          fetch-depth: 0    # Fetch all history for .GitInfo and .Lastmod
 
       - name: Hugo setup
         uses: peaceiris/actions-hugo@v2
diff --git a/.github/workflows/firebase-hosting-pull-request.yml b/.github/workflows/firebase-hosting-pull-request.yml
index f15fa53..a276221 100644
--- a/.github/workflows/firebase-hosting-pull-request.yml
+++ b/.github/workflows/firebase-hosting-pull-request.yml
@@ -10,6 +10,9 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v2
+        with:
+          submodules: true  # Fetch Hugo themes (true OR recursive)
+          fetch-depth: 0    # Fetch all history for .GitInfo and .Lastmod
 
       - name: Hugo setup
         uses: peaceiris/actions-hugo@v2