diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
new file mode 100644
index 0000000..6543979
--- /dev/null
+++ b/.github/workflows/main.yml
@@ -0,0 +1,26 @@
+name: Main
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+jobs:
+  test:
+    name: 'CI Tests'
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest]
+        # Due to https://github.com/actions/runner/issues/849, we have to use quotes for '3.0'
+        ruby: [jruby, truffleruby, 2.5, 2.6, 2.7, '3.0', head]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v2
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ matrix.ruby }}
+          bundler-cache: false
+      - run: bundle install
+      - run: bundle exec rspec
diff --git a/Gemfile b/Gemfile
index d4197fe..a7e939e 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,7 +1,7 @@
 source "https://rubygems.org"
 
 # Travis-only dependencies go here
-if ENV["CI"] == "true"
+if ENV["CI"] == "true" && RUBY_ENGINE == "ruby"
   gem "codecov", require: false, group: "test"
 end
 
diff --git a/README.md b/README.md
index 907738d..f6be351 100644
--- a/README.md
+++ b/README.md
@@ -7,6 +7,7 @@
 [![Yard Docs](http://img.shields.io/badge/yard-docs-blue.svg)](http://rubydoc.info/github/ms-ati/docile)
 [![Docs Coverage](http://inch-ci.org/github/ms-ati/docile.png)](http://inch-ci.org/github/ms-ati/docile)
 
+[![Build Status](https://github.com/ms-ati/docile/actions/workflows/main.yml/badge.svg)](https://github.com/ms-ati/docile/actions/workflows/main.yml)
 [![Build Status](https://img.shields.io/travis/ms-ati/docile/master.svg)](https://travis-ci.org/ms-ati/docile)
 [![Code Coverage](https://img.shields.io/codecov/c/github/ms-ati/docile.svg)](https://codecov.io/github/ms-ati/docile)
 [![Maintainability](https://api.codeclimate.com/v1/badges/79ca631bc123f7b83b34/maintainability)](https://codeclimate.com/github/ms-ati/docile/maintainability)
@@ -351,13 +352,20 @@ $ gem install docile
 
 ## Status
 
-Works on [all currently supported ruby versions](https://github.com/ms-ati/docile/blob/master/.travis.yml), or so Travis CI [tells us](https://travis-ci.org/ms-ati/docile).
+Works on [all currently supported ruby versions](https://github.com/ms-ati/docile/blob/master/.github/workflows/main.yml),
+or so [Github Actions](https://github.com/ms-ati/docile/actions)
+and [Travis CI](https://travis-ci.org/ms-ati/docile)
+tell us.
 
-Used by some pretty cool gems to implement their DSLs, notably including [SimpleCov](https://github.com/colszowka/simplecov). Keep an eye out for new gems using Docile at the [Ruby Toolbox](https://www.ruby-toolbox.com/projects/docile).
+Used by some pretty cool gems to implement their DSLs, notably including
+[SimpleCov](https://github.com/colszowka/simplecov). Keep an eye out for new
+gems using Docile at the
+[Ruby Toolbox](https://www.ruby-toolbox.com/projects/docile).
 
 ## Release Policy
 
-Docile releases follow [Semantic Versioning 2.0.0](https://semver.org/spec/v2.0.0.html).
+Docile releases follow
+[Semantic Versioning 2.0.0](https://semver.org/spec/v2.0.0.html).
 
 ## Note on Patches/Pull Requests
 
@@ -376,4 +384,5 @@ Docile releases follow [Semantic Versioning 2.0.0](https://semver.org/spec/v2.0.
 
 Copyright (c) 2012-2021 Marc Siegel.
 
-Licensed under the [MIT License](http://choosealicense.com/licenses/mit/), see [LICENSE](LICENSE) for details.
+Licensed under the [MIT License](http://choosealicense.com/licenses/mit/),
+see [LICENSE](LICENSE) for details.
diff --git a/docile.gemspec b/docile.gemspec
index 4de5065..7a7ef86 100644
--- a/docile.gemspec
+++ b/docile.gemspec
@@ -23,8 +23,8 @@ Gem::Specification.new do |s|
   end
   s.require_paths = ["lib"]
 
-  # Specify oldest supported Ruby version
-  s.required_ruby_version = ">= 2.6.0"
+  # Specify oldest supported Ruby version (2.5 to support JRuby 9.2.17.0)
+  s.required_ruby_version = ">= 2.5.0"
 
   s.add_development_dependency "rake", "~> 12.3.3"
   s.add_development_dependency "rspec", "~> 3.9"
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 81f64f7..810699a 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -6,8 +6,8 @@
     add_filter "/vendor/"    # exclude gems which are vendored on Travis CI
   end
 
-  # On CI we publish simplecov results to codecov.io
-  if ENV["CI"] == "true"
+  # On CI we publish coverage to codecov.io, except on JRuby and TruffleRuby
+  if ENV["CI"] == "true" && RUBY_ENGINE == "ruby"
     require "codecov"
     SimpleCov.formatter = SimpleCov::Formatter::Codecov
   end