diff --git a/.github/workflows/depup.yml b/.github/workflows/depup.yml
index dc03a09..925dd5d 100644
--- a/.github/workflows/depup.yml
+++ b/.github/workflows/depup.yml
@@ -11,24 +11,20 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - uses: haya14busa/action-depup@v1
-        id: depup
+      - uses: reviewdog/action-depup/with-pr@v1
         with:
-          file: Dockerfile
-          version_name: REVIEWDOG_VERSION
+          file: action.yml
+          version_name: reviewdog_version
           repo: reviewdog/reviewdog
+          labels: "bump:minor"
 
-      - name: Create Pull Request
-        uses: peter-evans/create-pull-request@v3
+  shellcheck:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: reviewdog/action-depup/with-pr@v1
         with:
-          token: ${{ secrets.GITHUB_TOKEN }}
-          title: "chore(deps): update reviewdog to ${{ steps.depup.outputs.latest }}"
-          commit-message: "chore(deps): update reviewdog to ${{ steps.depup.outputs.latest }}"
-          body: |
-            Update reviewdog to [v${{ steps.depup.outputs.latest }}](https://github.com/reviewdog/reviewdog/releases/tag/v${{ steps.depup.outputs.latest }})
-            Compare [v${{ steps.depup.outputs.current }}...v${{ steps.depup.outputs.latest }}](https://github.com/reviewdog/reviewdog/compare/v${{ steps.depup.outputs.current }}...v${{ steps.depup.outputs.latest }})
-
-            This PR is auto generated by [depup workflow](https://github.com/${{ github.repository }}/actions?query=workflow%3Adepup).
-          branch: depup/reviewdog
-          base: master
+          file: action.yml
+          version_name: SHELLCHECK_VERSION
+          repo: koalaman/shellcheck
           labels: "bump:minor"
diff --git a/.github/workflows/dockerimage.yml b/.github/workflows/dockerimage.yml
deleted file mode 100644
index 35a6b1c..0000000
--- a/.github/workflows/dockerimage.yml
+++ /dev/null
@@ -1,14 +0,0 @@
-name: Docker Image CI
-
-on: [push]
-
-jobs:
-
-  build:
-
-    runs-on: ubuntu-latest
-
-    steps:
-    - uses: actions/checkout@v2
-    - name: Build the Docker image
-      run: docker build . --file Dockerfile --tag reviewdog-shellcheck:$(date +%s)
diff --git a/Dockerfile b/Dockerfile
deleted file mode 100644
index f5ea3b8..0000000
--- a/Dockerfile
+++ /dev/null
@@ -1,12 +0,0 @@
-FROM koalaman/shellcheck-alpine:latest
-
-ENV REVIEWDOG_VERSION=v0.13.0
-
-RUN wget -O - -q https://raw.githubusercontent.com/reviewdog/reviewdog/master/install.sh| sh -s -- -b /usr/local/bin/ ${REVIEWDOG_VERSION}
-RUN apk --update add jq git findutils && \
-    rm -rf /var/lib/apt/lists/* && \
-    rm /var/cache/apk/*
-
-COPY entrypoint.sh /entrypoint.sh
-
-ENTRYPOINT ["/entrypoint.sh"]
diff --git a/action.yml b/action.yml
index fd23dd4..615ff1f 100644
--- a/action.yml
+++ b/action.yml
@@ -5,42 +5,71 @@ inputs:
   github_token:
     description: 'GITHUB_TOKEN.'
     default: '${{ github.token }}'
+    required: false
   level:
     description: 'Report level for reviewdog [info,warning,error]'
     default: 'error'
+    required: false
   reporter:
     description: |
       Reporter of reviewdog command [github-pr-check,github-pr-review,github-check].
       Default is github-pr-check.
       github-pr-review can use Markdown and add a link to rule page in reviewdog reports.
     default: 'github-pr-check'
+    required: false
   filter_mode:
     description: |
       Filtering mode for the reviewdog command [added,diff_context,file,nofilter].
       Default is added.
     default: 'added'
+    required: false
   fail_on_error:
     description: |
       Exit code for reviewdog when errors are found [true,false]
       Default is `false`.
     default: 'false'
+    required: false
   reviewdog_flags:
     description: 'Additional reviewdog flags'
     default: ''
+    required: false
   path:
     description: "Base directory to run shellcheck. Same as `[path]` of `find` command."
     default: '.'
+    required: false
   pattern:
     description: "File patterns of target files. Same as `-name [pattern]` of `find` command."
     default: '*.sh'
+    required: false
   exclude:
     description: "Exclude patterns of target files. Same as `-not -path [exclude]` of `find` command."
   shellcheck_flags:
     description: "Flags of shellcheck command."
     default: '--external-sources'
+    required: false
 runs:
-  using: 'docker'
-  image: 'Dockerfile'
+  using: "composite"
+  steps:
+    - uses: reviewdog/action-setup@v1
+      with:
+        reviewdog_version: v0.13.0
+    - run: $GITHUB_ACTION_PATH/script.sh
+      shell: bash
+      env:
+        SHELLCHECK_VERSION: 0.7.2
+        # INPUT_<VARIABLE_NAME> is not available in Composite run steps
+        # https://github.community/t/input-variable-name-is-not-available-in-composite-run-steps/127611
+        INPUT_GITHUB_TOKEN: ${{ inputs.github_token }}
+        INPUT_LEVEL: ${{ inputs.level }}
+        INPUT_REPORTER: ${{ inputs.reporter }}
+        INPUT_FILTER_MODE: ${{ inputs.filter_mode }}
+        INPUT_FAIL_ON_ERROR: ${{ inputs.fail_on_error }}
+        INPUT_REVIEWDOG_FLAGS: ${{ inputs.reviewdog_flags }}
+        INPUT_PATH: ${{ inputs.path }}
+        INPUT_PATTERN: ${{ inputs.pattern }}
+        INPUT_EXCLUDE: ${{ inputs.exclude }}
+        INPUT_SHELLCHECK_FLAGS: ${{ inputs.shellcheck_flags }}
+
 branding:
   icon: 'zoom-in'
   color: 'purple'
diff --git a/entrypoint.sh b/script.sh
similarity index 76%
rename from entrypoint.sh
rename to script.sh
index bf6be2c..89d86ba 100755
--- a/entrypoint.sh
+++ b/script.sh
@@ -1,5 +1,14 @@
 #!/bin/sh
 
+echo '::group:: Installing shellcheck ... https://github.com/koalaman/shellcheck'
+TEMP_PATH="$(mktemp -d)"
+cd "${TEMP_PATH}" t ad || exit
+wget -qO- "https://github.com/koalaman/shellcheck/releases/download/v${SHELLCHECK_VERSION}/shellcheck-v${SHELLCHECK_VERSION}.linux.x86_64.tar.xz" | tar -xJf -
+mkdir bin
+cp "shellcheck-v$SHELLCHECK_VERSION/shellcheck" ./bin
+PATH="${TEMP_PATH}/bin:$PATH"
+echo '::endgroup::'
+
 cd "${GITHUB_WORKSPACE}" || exit
 
 export REVIEWDOG_GITHUB_API_TOKEN="${INPUT_GITHUB_TOKEN}"