diff --git a/.github/workflows/pr.yaml b/.github/workflows/pr.yaml
index 4695273..e66f6b6 100644
--- a/.github/workflows/pr.yaml
+++ b/.github/workflows/pr.yaml
@@ -11,11 +11,11 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby-version: [ "3.0.1", "2.6.7" ]
+        ruby-version: [ "3.4.1", "2.6.7" ]
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - name: Set up Ruby ${{ matrix.ruby-version }}
-        uses: ruby/setup-ruby@477b21f02be01bcb8030d50f37cfec92bfa615b6
+        uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.ruby-version }}
       - name: Install dependencies
diff --git a/.gitignore b/.gitignore
index de6e3f8..01e864f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,3 +3,4 @@ vendor/
 coverage/
 cuffsert-*.gem
 .byebug_history
+Gemfile.lock
diff --git a/.ruby-version b/.ruby-version
index fd2a018..47b322c 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-3.1.0
+3.4.1
diff --git a/Gemfile.lock b/Gemfile.lock
deleted file mode 100644
index 5bf8c66..0000000
--- a/Gemfile.lock
+++ /dev/null
@@ -1,82 +0,0 @@
-PATH
-  remote: .
-  specs:
-    cuffsert (0.14.2)
-      aws-sdk-cloudformation (~> 1.67.0)
-      aws-sdk-s3 (~> 1.112.0)
-      colorize
-      hashdiff (~> 1.0)
-      nokogiri
-      ruby-termios
-      rx
-
-GEM
-  remote: https://rubygems.org/
-  specs:
-    aws-eventstream (1.2.0)
-    aws-partitions (1.554.0)
-    aws-sdk-cloudformation (1.67.0)
-      aws-sdk-core (~> 3, >= 3.126.0)
-      aws-sigv4 (~> 1.1)
-    aws-sdk-core (3.126.0)
-      aws-eventstream (~> 1, >= 1.0.2)
-      aws-partitions (~> 1, >= 1.525.0)
-      aws-sigv4 (~> 1.1)
-      jmespath (~> 1.0)
-    aws-sdk-kms (1.54.0)
-      aws-sdk-core (~> 3, >= 3.126.0)
-      aws-sigv4 (~> 1.1)
-    aws-sdk-s3 (1.112.0)
-      aws-sdk-core (~> 3, >= 3.126.0)
-      aws-sdk-kms (~> 1)
-      aws-sigv4 (~> 1.4)
-    aws-sigv4 (1.4.0)
-      aws-eventstream (~> 1, >= 1.0.2)
-    byebug (11.1.3)
-    colorize (0.8.1)
-    diff-lcs (1.5.0)
-    docile (1.4.0)
-    hashdiff (1.0.1)
-    jmespath (1.5.0)
-    mini_portile2 (2.7.1)
-    nokogiri (1.13.1)
-      mini_portile2 (~> 2.7.0)
-      racc (~> 1.4)
-    racc (1.6.0)
-    rspec (3.11.0)
-      rspec-core (~> 3.11.0)
-      rspec-expectations (~> 3.11.0)
-      rspec-mocks (~> 3.11.0)
-    rspec-core (3.11.0)
-      rspec-support (~> 3.11.0)
-    rspec-expectations (3.11.0)
-      diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.11.0)
-    rspec-mocks (3.11.0)
-      diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.11.0)
-    rspec-support (3.11.0)
-    ruby-termios (1.1.0)
-    rx (0.0.3)
-    rx-rspec (0.4.3)
-      rx
-    simplecov (0.21.2)
-      docile (~> 1.1)
-      simplecov-html (~> 0.11)
-      simplecov_json_formatter (~> 0.1)
-    simplecov-html (0.12.3)
-    simplecov_json_formatter (0.1.3)
-
-PLATFORMS
-  ruby
-
-DEPENDENCIES
-  bundler (~> 2.3)
-  byebug
-  cuffsert!
-  rspec (~> 3.0)
-  rx-rspec (~> 0.4.3)
-  simplecov
-
-BUNDLED WITH
-   2.3.7
diff --git a/cuffsert.gemspec b/cuffsert.gemspec
index 4ef5919..92774d4 100644
--- a/cuffsert.gemspec
+++ b/cuffsert.gemspec
@@ -15,16 +15,18 @@ Gem::Specification.new do |spec|
 
   spec.required_ruby_version = '>= 2.0.0'
 
-  spec.add_runtime_dependency 'aws-sdk-cloudformation', '~> 1.67.0'
-  spec.add_runtime_dependency 'aws-sdk-s3', '~> 1.112.0'
+  spec.add_runtime_dependency 'aws-sdk-cloudformation', '~> 1.67'
+  spec.add_runtime_dependency 'aws-sdk-s3', '~> 1.112'
   spec.add_runtime_dependency 'colorize'
   spec.add_runtime_dependency 'hashdiff', '~> 1.0'
   spec.add_runtime_dependency 'nokogiri'
   spec.add_runtime_dependency 'ruby-termios'
   spec.add_runtime_dependency 'rx'
 
+  spec.add_development_dependency 'base64'
   spec.add_development_dependency 'bundler', '~> 2.3'
   spec.add_development_dependency 'byebug'
+  spec.add_development_dependency 'logger'
   spec.add_development_dependency 'rspec', '~> 3.0'
   spec.add_development_dependency 'rx-rspec', '~> 0.4.3'
   spec.add_development_dependency 'simplecov'
diff --git a/lib/cuffsert/metadata.rb b/lib/cuffsert/metadata.rb
index 39d7b3b..74f266f 100644
--- a/lib/cuffsert/metadata.rb
+++ b/lib/cuffsert/metadata.rb
@@ -84,7 +84,7 @@ def self.build_meta(cli_args)
 
   def self.meta_defaults(cli_args)
     stack_path = (cli_args[:stack_path] || [])[0]
-    if stack_path && File.exists?(stack_path)
+    if stack_path && File.exist?(stack_path)
       nil_params = CuffBase.empty_from_template(open(stack_path))
     else
       nil_params = {}