diff --git a/.github/workflows/unf_ext.yml b/.github/workflows/unf_ext.yml
new file mode 100644
index 0000000..205d767
--- /dev/null
+++ b/.github/workflows/unf_ext.yml
@@ -0,0 +1,49 @@
+name: CI
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    name: >-
+      ${{ matrix.os }} ${{ matrix.ruby }}
+
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ ubuntu-20.04, macos-11.0, windows-2019 ]
+        ruby: [ 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 3.0, head ]
+        include:
+          - { os: windows-2019, ruby: mingw }
+        exclude:
+          - { os: macos-11.0, ruby: 2.2 }
+          - { os: macos-11.0, ruby: 2.3 }
+          - { os: windows-2019, ruby: head }
+
+    steps:
+      - name: repo checkout
+        uses: actions/checkout@v2
+
+      - name: load ruby cross-compilation toolkit
+        uses: MSP-Greg/setup-ruby-pkgs@v1
+        with:
+          ruby-version: ${{ matrix.ruby }}
+          mingw: _upgrade_
+
+      - name:  bundle install
+        shell: pwsh
+        run: |
+          # update RubyGems in Ruby 2.2, bundle install
+          if ('${{ matrix.ruby }}' -lt '2.3') {
+            gem update --system 2.7.10 --no-document
+          }
+          bundle config set --local path .bundle/vendor
+          bundle install --jobs 4 --retry 3
+
+      - name: compile
+        timeout-minutes: 5
+        run: bundle exec rake compile
+
+      - name: test
+        timeout-minutes: 5
+        run: bundle exec rake test
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index 904721d..0000000
--- a/.travis.yml
+++ /dev/null
@@ -1,22 +0,0 @@
-language: ruby
-sudo: false
-rvm:
-  - 1.8.7
-  - ree
-  - 1.9.3
-  - 2.0
-  - 2.1
-  - 2.2
-  - 2.3
-  - 2.4
-  - 2.5
-  - 2.6
-  - 2.7
-  - ruby-head
-matrix:
-  allow_failures:
-    - rvm: ruby-head
-before_install:
-  - gem update --system --conservative || gem install --conservative bundler -v '<2'
-before_script:
-  - rake compile
diff --git a/CHANGELOG.md b/CHANGELOG.md
index b3069a4..5318936 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,10 @@
-## 0.0.7.7 (2019-03-19)
+## Unreleased
+
+- Include Windows binaries for Ruby 3.0.
+- Drop support for Ruby 2.1 and earlier.
+- Replace Travis CI with Github Actions.
+
+## 0.0.7.7 (2020-03-30)
 
 - Include Windows binaries for Ruby 2.7.
 
diff --git a/Rakefile b/Rakefile
index cb3e8fa..e70b778 100644
--- a/Rakefile
+++ b/Rakefile
@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 require 'bundler/gem_tasks'
 
 gemspec = Bundler::GemHelper.gemspec
diff --git a/test/test_unf_ext.rb b/test/test_unf_ext.rb
index 2476672..45b03e9 100644
--- a/test/test_unf_ext.rb
+++ b/test/test_unf_ext.rb
@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 require 'helper'
 require 'pathname'
 
diff --git a/unf_ext.gemspec b/unf_ext.gemspec
index aebaeae..8c569a9 100644
--- a/unf_ext.gemspec
+++ b/unf_ext.gemspec
@@ -1,4 +1,3 @@
-# -*- encoding: utf-8 -*-
 lib = File.expand_path('../lib', __FILE__)
 $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
 require 'unf_ext/version'
@@ -24,17 +23,10 @@ Gem::Specification.new do |gem|
     "README.md"
   ]
 
-  if RUBY_VERSION < "1.9"
-    gem.add_development_dependency("rake", [">= 0.9.2.2", "< 11"])
-    gem.add_development_dependency('i18n', '< 0.7.0')
-    # Cap dependency on activesupport with < 4.0 on behalf of
-    # shoulda-matchers to satisfy bundler.
-    gem.add_development_dependency("activesupport", ["< 4.0"])
-    gem.add_development_dependency("test-unit", ["= 3.1.5"])
-  else
-    gem.add_development_dependency("rake", [">= 0.9.2.2"])
-    gem.add_development_dependency("test-unit")
-  end
+  gem.required_ruby_version = '>= 2.2'
+
+  gem.add_development_dependency("rake", [">= 0.9.2.2"])
+  gem.add_development_dependency("test-unit")
   gem.add_development_dependency("rdoc", ["> 2.4.2"])
   gem.add_development_dependency("bundler", [">= 1.2"])
   gem.add_development_dependency("rake-compiler", [">= 0.7.9"])