diff --git a/.github/workflows/merge.yml b/.github/workflows/merge.yml
index 3e739f6..427830d 100644
--- a/.github/workflows/merge.yml
+++ b/.github/workflows/merge.yml
@@ -32,6 +32,9 @@ jobs:
     timeout-minutes: 10
     steps:
       - uses: actions/checkout@v3
+        with:
+          # Using fetch-depth 0 is the only way to get all tags which are needed for building docs.
+          fetch-depth: 0
 
       - name: Checkout gh-pages branch to dir publish/
         uses: actions/checkout@v3
diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index c07c7a3..7e534a9 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -32,6 +32,9 @@ jobs:
     timeout-minutes: 10
     steps:
       - uses: actions/checkout@v3
+        with:
+          # Using fetch-depth 0 is the only way to get all tags which are needed for building docs.
+          fetch-depth: 0
 
       - name: Checkout gh-pages branch to dir publish/
         uses: actions/checkout@v3