diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index fd04b0d..13639b1 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -5,9 +5,9 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby: [2.6, 2.7, "3.0"]
+        ruby: ["3.2", "3.3", "3.4"]
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.ruby }}
@@ -16,13 +16,10 @@ jobs:
 
   lint:
     runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        ruby: [2.6]
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - uses: ruby/setup-ruby@v1
         with:
-          ruby-version: ${{ matrix.ruby }}
+          ruby-version: "3.4"
           bundler-cache: true
       - run: bundle exec rake lint
diff --git a/.gitignore b/.gitignore
index b04a8c8..5c249f1 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,3 +9,5 @@
 
 # rspec failure tracking
 .rspec_status
+
+Gemfile.lock
diff --git a/Gemfile.lock b/Gemfile.lock
deleted file mode 100644
index df83f8a..0000000
--- a/Gemfile.lock
+++ /dev/null
@@ -1,87 +0,0 @@
-PATH
-  remote: .
-  specs:
-    telephone (1.0.0)
-      activemodel
-
-GEM
-  remote: https://rubygems.org/
-  specs:
-    activemodel (7.0.3.1)
-      activesupport (= 7.0.3.1)
-    activesupport (7.0.3.1)
-      concurrent-ruby (~> 1.0, >= 1.0.2)
-      i18n (>= 1.6, < 2)
-      minitest (>= 5.1)
-      tzinfo (~> 2.0)
-    ast (2.4.2)
-    coderay (1.1.3)
-    concurrent-ruby (1.1.10)
-    diff-lcs (1.4.4)
-    i18n (1.12.0)
-      concurrent-ruby (~> 1.0)
-    method_source (1.0.0)
-    minitest (5.16.2)
-    mocha (1.12.0)
-    parallel (1.20.1)
-    parser (3.0.1.0)
-      ast (~> 2.4.1)
-    pry (0.14.1)
-      coderay (~> 1.1)
-      method_source (~> 1.0)
-    rainbow (3.0.0)
-    rake (12.3.3)
-    regexp_parser (2.1.1)
-    rexml (3.2.5)
-    rspec (3.10.0)
-      rspec-core (~> 3.10.0)
-      rspec-expectations (~> 3.10.0)
-      rspec-mocks (~> 3.10.0)
-    rspec-core (3.10.1)
-      rspec-support (~> 3.10.0)
-    rspec-expectations (3.10.1)
-      diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.10.0)
-    rspec-mocks (3.10.2)
-      diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.10.0)
-    rspec-support (3.10.2)
-    rubocop (1.12.1)
-      parallel (~> 1.10)
-      parser (>= 3.0.0.0)
-      rainbow (>= 2.2.2, < 4.0)
-      regexp_parser (>= 1.8, < 3.0)
-      rexml
-      rubocop-ast (>= 1.2.0, < 2.0)
-      ruby-progressbar (~> 1.7)
-      unicode-display_width (>= 1.4.0, < 3.0)
-    rubocop-ast (1.4.1)
-      parser (>= 2.7.1.5)
-    rubocop-performance (1.10.1)
-      rubocop (>= 0.90.0, < 2.0)
-      rubocop-ast (>= 0.4.0)
-    ruby-progressbar (1.11.0)
-    standard (1.0.5)
-      rubocop (= 1.12.1)
-      rubocop-performance (= 1.10.1)
-    standardrb (1.0.0)
-      standard
-    tzinfo (2.0.5)
-      concurrent-ruby (~> 1.0)
-    unicode-display_width (2.0.0)
-    yard (0.9.26)
-
-PLATFORMS
-  ruby
-
-DEPENDENCIES
-  mocha
-  pry
-  rake (~> 12.0)
-  rspec (~> 3.0)
-  standardrb
-  telephone!
-  yard
-
-BUNDLED WITH
-   2.1.4
diff --git a/telephone.gemspec b/telephone.gemspec
index c2af0ab..78db7e3 100644
--- a/telephone.gemspec
+++ b/telephone.gemspec
@@ -18,7 +18,7 @@ Gem::Specification.new do |s|
     "source_code_uri" => "https://github.com/bharget/telephone"
   }
 
-  s.required_ruby_version = ">= 2.6.0"
+  s.required_ruby_version = ">= 3.2.0"
 
   s.files = Dir["README.md", "lib/**/*"]
   s.require_paths = ["lib"]