diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..e0dde91
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,24 @@
+name: CI
+on: [pull_request]
+jobs:
+  test-skip-install-and-use-bundler:
+    name: runner / rubocop
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: test/using_bundler
+    env:
+      BUNDLE_GEMFILE: ${{ github.workspace }}/test/using_bundler/Gemfile
+    steps:
+      - uses: actions/checkout@v2
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: 2.6
+          bundler-cache: true
+      - name: rubocop with skip install and using bundler
+        uses: ./
+        with:
+          github_token: ${{ secrets.github_token }}
+          skip_install: 'true'
+          use_bundler: 'true'
+      - run: test "$(bundle exec rubocop --version)" == "1.18.1"
diff --git a/action.yml b/action.yml
index aa53b87..54f9a27 100644
--- a/action.yml
+++ b/action.yml
@@ -40,6 +40,12 @@ inputs:
   workdir:
     description: "The directory from which to look for and run Rubocop. Default '.'"
     default: '.'
+  skip_install:
+    description: "Do not install Rubocop or its extensions. Default: `false`"
+    default: 'false'
+  use_bundler:
+    description: "Run Rubocop with bundle exec. Default: `false`"
+    default: 'false'
 runs:
   using: 'composite'
   steps:
@@ -60,6 +66,8 @@ runs:
         INPUT_FAIL_ON_ERROR: ${{ inputs.fail_on_error }}
         INPUT_REVIEWDOG_FLAGS: ${{ inputs.reviewdog_flags }}
         INPUT_WORKDIR: ${{ inputs.workdir }}
+        INPUT_SKIP_INSTALL: ${{ inputs.skip_install }}
+        INPUT_USE_BUNDLER: ${{ inputs.use_bundler }}
 branding:
   icon: 'check-circle'
   color: 'red'
diff --git a/script.sh b/script.sh
index 1493fc9..f906bf3 100755
--- a/script.sh
+++ b/script.sh
@@ -15,76 +15,84 @@ echo '::group::🐶 Installing reviewdog ... https://github.com/reviewdog/review
 curl -sfL https://raw.githubusercontent.com/reviewdog/reviewdog/master/install.sh | sh -s -- -b "${TEMP_PATH}" "${REVIEWDOG_VERSION}" 2>&1
 echo '::endgroup::'
 
-echo '::group:: Installing rubocop with extensions ... https://github.com/rubocop/rubocop'
-# if 'gemfile' rubocop version selected
-if [ "${INPUT_RUBOCOP_VERSION}" = "gemfile" ]; then
-  # if Gemfile.lock is here
-  if [ -f 'Gemfile.lock' ]; then
-    # grep for rubocop version
-    RUBOCOP_GEMFILE_VERSION=$(ruby -ne 'print $& if /^\s{4}rubocop\s\(\K.*(?=\))/' Gemfile.lock)
+if [ "${INPUT_SKIP_INSTALL}" = "false" ]; then
+  echo '::group:: Installing rubocop with extensions ... https://github.com/rubocop/rubocop'
+  # if 'gemfile' rubocop version selected
+  if [ "${INPUT_RUBOCOP_VERSION}" = "gemfile" ]; then
+    # if Gemfile.lock is here
+    if [ -f 'Gemfile.lock' ]; then
+      # grep for rubocop version
+      RUBOCOP_GEMFILE_VERSION=$(ruby -ne 'print $& if /^\s{4}rubocop\s\(\K.*(?=\))/' Gemfile.lock)
 
-    # if rubocop version found, then pass it to the gem install
-    # left it empty otherwise, so no version will be passed
-    if [ -n "$RUBOCOP_GEMFILE_VERSION" ]; then
-      RUBOCOP_VERSION=$RUBOCOP_GEMFILE_VERSION
+      # if rubocop version found, then pass it to the gem install
+      # left it empty otherwise, so no version will be passed
+      if [ -n "$RUBOCOP_GEMFILE_VERSION" ]; then
+        RUBOCOP_VERSION=$RUBOCOP_GEMFILE_VERSION
+        else
+          printf "Cannot get the rubocop's version from Gemfile.lock. The latest version will be installed."
+      fi
       else
-        printf "Cannot get the rubocop's version from Gemfile.lock. The latest version will be installed."
+        printf 'Gemfile.lock not found. The latest version will be installed.'
     fi
     else
-      printf 'Gemfile.lock not found. The latest version will be installed.'
+      # set desired rubocop version
+      RUBOCOP_VERSION=$INPUT_RUBOCOP_VERSION
   fi
-  else
-    # set desired rubocop version
-    RUBOCOP_VERSION=$INPUT_RUBOCOP_VERSION
-fi
 
-gem install -N rubocop --version "${RUBOCOP_VERSION}"
+  gem install -N rubocop --version "${RUBOCOP_VERSION}"
 
-# Traverse over list of rubocop extensions
-for extension in $INPUT_RUBOCOP_EXTENSIONS; do
-  # grep for name and version
-  INPUT_RUBOCOP_EXTENSION_NAME=$(echo "$extension" |awk 'BEGIN { FS = ":" } ; { print $1 }')
-  INPUT_RUBOCOP_EXTENSION_VERSION=$(echo "$extension" |awk 'BEGIN { FS = ":" } ; { print $2 }')
+  # Traverse over list of rubocop extensions
+  for extension in $INPUT_RUBOCOP_EXTENSIONS; do
+    # grep for name and version
+    INPUT_RUBOCOP_EXTENSION_NAME=$(echo "$extension" |awk 'BEGIN { FS = ":" } ; { print $1 }')
+    INPUT_RUBOCOP_EXTENSION_VERSION=$(echo "$extension" |awk 'BEGIN { FS = ":" } ; { print $2 }')
 
-  # if version is 'gemfile'
-  if [ "${INPUT_RUBOCOP_EXTENSION_VERSION}" = "gemfile" ]; then
-    # if Gemfile.lock is here
-    if [ -f 'Gemfile.lock' ]; then
-      # grep for rubocop extension version
-      RUBOCOP_EXTENSION_GEMFILE_VERSION=$(ruby -ne "print $& if /^\s{4}$INPUT_RUBOCOP_EXTENSION_NAME\s\(\K.*(?=\))/" Gemfile.lock)
+    # if version is 'gemfile'
+    if [ "${INPUT_RUBOCOP_EXTENSION_VERSION}" = "gemfile" ]; then
+      # if Gemfile.lock is here
+      if [ -f 'Gemfile.lock' ]; then
+        # grep for rubocop extension version
+        RUBOCOP_EXTENSION_GEMFILE_VERSION=$(ruby -ne "print $& if /^\s{4}$INPUT_RUBOCOP_EXTENSION_NAME\s\(\K.*(?=\))/" Gemfile.lock)
 
-      # if rubocop extension version found, then pass it to the gem install
-      # left it empty otherwise, so no version will be passed
-      if [ -n "$RUBOCOP_EXTENSION_GEMFILE_VERSION" ]; then
-        RUBOCOP_EXTENSION_VERSION=$RUBOCOP_EXTENSION_GEMFILE_VERSION
+        # if rubocop extension version found, then pass it to the gem install
+        # left it empty otherwise, so no version will be passed
+        if [ -n "$RUBOCOP_EXTENSION_GEMFILE_VERSION" ]; then
+          RUBOCOP_EXTENSION_VERSION=$RUBOCOP_EXTENSION_GEMFILE_VERSION
+          else
+            printf "Cannot get the rubocop extension version from Gemfile.lock. The latest version will be installed."
+        fi
         else
-          printf "Cannot get the rubocop extension version from Gemfile.lock. The latest version will be installed."
+          printf 'Gemfile.lock not found. The latest version will be installed.'
       fi
-      else
-        printf 'Gemfile.lock not found. The latest version will be installed.'
+    else
+      # set desired rubocop extension version
+      RUBOCOP_EXTENSION_VERSION=$INPUT_RUBOCOP_EXTENSION_VERSION
     fi
-  else
-    # set desired rubocop extension version
-    RUBOCOP_EXTENSION_VERSION=$INPUT_RUBOCOP_EXTENSION_VERSION
-  fi
 
-  # Handle extensions with no version qualifier
-  if [ -z "${RUBOCOP_EXTENSION_VERSION}" ]; then
-    unset RUBOCOP_EXTENSION_VERSION_FLAG
-  else
-    RUBOCOP_EXTENSION_VERSION_FLAG="--version ${RUBOCOP_EXTENSION_VERSION}"
-  fi
+    # Handle extensions with no version qualifier
+    if [ -z "${RUBOCOP_EXTENSION_VERSION}" ]; then
+      unset RUBOCOP_EXTENSION_VERSION_FLAG
+    else
+      RUBOCOP_EXTENSION_VERSION_FLAG="--version ${RUBOCOP_EXTENSION_VERSION}"
+    fi
 
-  # shellcheck disable=SC2086
-  gem install -N "${INPUT_RUBOCOP_EXTENSION_NAME}" ${RUBOCOP_EXTENSION_VERSION_FLAG}
-done
-echo '::endgroup::'
+    # shellcheck disable=SC2086
+    gem install -N "${INPUT_RUBOCOP_EXTENSION_NAME}" ${RUBOCOP_EXTENSION_VERSION_FLAG}
+  done
+  echo '::endgroup::'
+fi
 
 export REVIEWDOG_GITHUB_API_TOKEN="${INPUT_GITHUB_TOKEN}"
 
+if [ "${INPUT_USE_BUNDLER}" = "false" ]; then
+  BUNDLE_EXEC=""
+else
+  BUNDLE_EXEC="bundle exec "
+fi
+
 echo '::group:: Running rubocop with reviewdog 🐶 ...'
 # shellcheck disable=SC2086
-rubocop ${INPUT_RUBOCOP_FLAGS} \
+${BUNDLE_EXEC}rubocop ${INPUT_RUBOCOP_FLAGS} \
   | reviewdog -f=rubocop \
       -name="${INPUT_TOOL_NAME}" \
       -reporter="${INPUT_REPORTER}" \
diff --git a/test/using_bundler/Gemfile b/test/using_bundler/Gemfile
new file mode 100644
index 0000000..11d1436
--- /dev/null
+++ b/test/using_bundler/Gemfile
@@ -0,0 +1,5 @@
+# frozen_string_literal: true
+
+source 'https://rubygems.org'
+
+gem 'rubocop'
diff --git a/test/using_bundler/Gemfile.lock b/test/using_bundler/Gemfile.lock
new file mode 100644
index 0000000..8b9e7fe
--- /dev/null
+++ b/test/using_bundler/Gemfile.lock
@@ -0,0 +1,32 @@
+GEM
+  remote: https://rubygems.org/
+  specs:
+    ast (2.4.2)
+    parallel (1.20.1)
+    parser (3.0.2.0)
+      ast (~> 2.4.1)
+    rainbow (3.0.0)
+    regexp_parser (2.1.1)
+    rexml (3.2.5)
+    rubocop (1.18.1)
+      parallel (~> 1.10)
+      parser (>= 3.0.0.0)
+      rainbow (>= 2.2.2, < 4.0)
+      regexp_parser (>= 1.8, < 3.0)
+      rexml
+      rubocop-ast (>= 1.7.0, < 2.0)
+      ruby-progressbar (~> 1.7)
+      unicode-display_width (>= 1.4.0, < 3.0)
+    rubocop-ast (1.9.0)
+      parser (>= 3.0.1.1)
+    ruby-progressbar (1.11.0)
+    unicode-display_width (2.0.0)
+
+PLATFORMS
+  x86_64-linux
+
+DEPENDENCIES
+  rubocop
+
+BUNDLED WITH
+   2.2.25