diff --git a/.github/workflows/depup.yml b/.github/workflows/depup.yml
index e56ac80..7e63e02 100644
--- a/.github/workflows/depup.yml
+++ b/.github/workflows/depup.yml
@@ -53,3 +53,27 @@ jobs:
 
             This PR is auto generated by [depup workflow](https://github.com/${{ github.repository }}/actions?query=workflow%3A${{ github.workflow }}).
           branch: depup/${{ steps.depup.outputs.repo }}
+
+  themis:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: ./
+        id: depup
+        with:
+          file: testdata/testfile
+          version_name: THEMIS_VERSION
+          repo: thinca/vim-themis
+          tag: true
+
+      - name: Create Pull Request
+        uses: peter-evans/create-pull-request@v3
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          title: "chore(deps): update ${{ steps.depup.outputs.repo }} to ${{ steps.depup.outputs.latest }}"
+          commit-message: "chore(deps): update ${{ steps.depup.outputs.repo }} to ${{ steps.depup.outputs.latest }}"
+          body: |
+            Update ${{ steps.depup.outputs.repo }} to [${{ steps.depup.outputs.latest }}](https://github.com/${{ steps.depup.outputs.repo }}/releases/tag/v${{ steps.depup.outputs.latest }})
+
+            This PR is auto generated by [depup workflow](https://github.com/${{ github.repository }}/actions?query=workflow%3A${{ github.workflow }}).
+          branch: depup/${{ steps.depup.outputs.repo }}
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 296b616..6f0b26d 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -61,3 +61,18 @@ jobs:
 
       - name: Check diff
         run: git diff
+
+  tagged_version:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: ./
+        id: depup
+        with:
+          file: testdata/testfile
+          version_name: THEMIS_VERSION
+          repo: thinca/vim-themis
+          tag: true
+
+      - name: Check diff
+        run: git diff
diff --git a/README.md b/README.md
index d243d56..0170979 100644
--- a/README.md
+++ b/README.md
@@ -51,6 +51,10 @@ inputs:
   repo:
     description: 'target GitHub repository. e.g. reviewdog/reviewdog'
     required: true
+  tag:
+    description: 'Check tags instead of releases.'
+    default: 'false'
+    required: false
 ```
 
 ## Example usage
diff --git a/action.yml b/action.yml
index 7fcaf23..28532f8 100644
--- a/action.yml
+++ b/action.yml
@@ -14,6 +14,10 @@ inputs:
   repo:
     description: 'target GitHub repository. e.g. reviewdog/reviewdog'
     required: true
+  tag:
+    description: 'Check tags instead of releases.'
+    default: 'false'
+    required: false
 runs:
   using: 'docker'
   image: 'Dockerfile'
diff --git a/entrypoint.sh b/entrypoint.sh
index 4b47069..e4e8386 100755
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -27,13 +27,23 @@ list_releases() {
     curl -s "https://api.github.com/repos/${REPO}/releases"
   fi
 }
+
+# Return version list from tags(refs/tags/vA.B.C and vA.B.C^{}) or releases
+list_versions() {
+  if [ "${INPUT_TAG:-false}" = "true" ]; then
+    git ls-remote -q --tags "https://github.com/${REPO}.git" | awk '{ print $2 }'
+  else
+    list_releases |  jq -r '.[] | .tag_name'
+  fi
+}
+
 LATEST_VERSION="$(\
-  list_releases | \
-  jq -r '.[] | .tag_name' | \
-  grep -oP '\d+\.\d+(\.\d+)?(-[^'\''\"\s]*)?$' | \
+  list_versions | \
+  grep -oP '\d+(\.\d+)+(-[^'\''\"\s]*)?$'| \
   sort --version-sort --reverse | \
   head -n1 \
-)"
+  )"
+
 if [ -z "${LATEST_VERSION}" ]; then
   echo "cannot get latest ${REPO} version"
   exit 1
diff --git a/testdata/testfile b/testdata/testfile
index 3d1c073..2e9cf8e 100644
--- a/testdata/testfile
+++ b/testdata/testfile
@@ -39,3 +39,5 @@ TMUX_VERSION=3.0
 
 POETRY_VERSION="1.1.3"
 ENV POETRY_VERSION='1.1.3'
+
+THEMIS_VERSION=1.5