diff --git a/README.md b/README.md
index c071fca..e8ffade 100644
--- a/README.md
+++ b/README.md
@@ -23,13 +23,13 @@ inputs:
   github_token:
     description: 'GITHUB_TOKEN'
     default: '${{ github.token }}'
-  tool_name:
-    description: 'Tool name to use for reviewdog reporter'
-    default: 'rails_best_practices'
   workdir:
     description: 'Working directory relative to the root directory.'
     default: '.'
   ### Flags for reviewdog ###
+  tool_name:
+    description: 'Tool name to use for reviewdog reporter'
+    default: 'rails_best_practices'
   level:
     description: 'Report level for reviewdog [info,warning,error]'
     default: 'error'
@@ -50,6 +50,8 @@ inputs:
     description: 'Additional reviewdog flags'
     default: ''
   ### Flags for rails_best_practices ###
+  rails_best_practices_version:
+    description: 'rails_best_practices version'
   rails_best_practices_flags:
     description: 'rails_best_practices flags (rails_best_practices --without-color --silent . <rails_best_practices_flags>)'
     default: ''
diff --git a/action.yml b/action.yml
index c440939..c658e17 100644
--- a/action.yml
+++ b/action.yml
@@ -5,13 +5,13 @@ inputs:
   github_token:
     description: 'GITHUB_TOKEN'
     default: '${{ github.token }}'
-  tool_name:
-    description: 'Tool name to use for reviewdog reporter'
-    default: 'rails_best_practices'
   workdir:
     description: 'Working directory relative to the root directory.'
     default: '.'
   ### Flags for reviewdog ###
+  tool_name:
+    description: 'Tool name to use for reviewdog reporter'
+    default: 'rails_best_practices'
   level:
     description: 'Report level for reviewdog [info,warning,error]'
     default: 'error'
@@ -32,6 +32,8 @@ inputs:
     description: 'Additional reviewdog flags'
     default: ''
   ### Flags for rails_best_practices ###
+  rails_best_practices_version:
+    description: 'rails_best_practices version'
   rails_best_practices_flags:
     description: 'rails_best_practices flags (rails_best_practices --without-color --silent . <rails_best_practices_flags>)'
     default: ''
@@ -50,13 +52,14 @@ runs:
         # 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_TOOL_NAME: ${{ inputs.tool_name }}
         INPUT_WORKDIR: ${{ inputs.workdir }}
+        INPUT_TOOL_NAME: ${{ inputs.tool_name }}
         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_RAILS_BEST_PRACTICES_VERSION: ${{ inputs.rails_best_practices_version }}
         INPUT_RAILS_BEST_PRACTICES_FLAGS: ${{ inputs.rails_best_practices_flags }}
 
 # Ref: https://haya14busa.github.io/github-action-brandings/
diff --git a/script.sh b/script.sh
index fa06b11..67982cc 100755
--- a/script.sh
+++ b/script.sh
@@ -8,7 +8,29 @@ fi
 export REVIEWDOG_GITHUB_API_TOKEN="${INPUT_GITHUB_TOKEN}"
 
 echo '::group::🐶 Installing rails_best_practices ... https://github.com/flyerhzm/rails_best_practices'
-gem install --no-document rails_best_practices
+# if 'gemfile' rails_best_practices version selected
+if [ "${INPUT_RAILS_BEST_PRACTICES_VERSION}" = "gemfile" ]; then
+  # if Gemfile.lock is here
+  if [ -f 'Gemfile.lock' ]; then
+    # grep for rails_best_practices version
+    RAILS_BEST_PRACTICES_GEMFILE_VERSION=$(ruby -ne 'print $& if /^\s{4}rails_best_practices\s\(\K.*(?=\))/' Gemfile.lock)
+
+    # if rails_best_practices version found, then pass it to the gem install
+    # left it empty otherwise, so no version will be passed
+    if [ -n "$RAILS_BEST_PRACTICES_GEMFILE_VERSION" ]; then
+      RAILS_BEST_PRACTICES_VERSION=$RAILS_BEST_PRACTICES_GEMFILE_VERSION
+    else
+      printf "Cannot get the rails_best_practices's version from Gemfile.lock. The latest version will be installed."
+    fi
+  else
+    printf 'Gemfile.lock not found. The latest version will be installed.'
+  fi
+else
+  # set desired rails_best_practices version
+  RAILS_BEST_PRACTICES_VERSION=$INPUT_RAILS_BEST_PRACTICES_VERSION
+fi
+
+gem install --no-document rails_best_practices --version "${RAILS_BEST_PRACTICES_VERSION}"
 echo '::endgroup::'
 
 echo '::group:: Running rails_best_practices with reviewdog 🐶 ...'