thodg/mpd_client

diff --git a/.travis.yml b/.travis.yml
index 7473163..f1a5a8f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,4 +1,10 @@
 language: ruby
+
+rvm:
+  - 3.0.0
+  - 2.7.2
+  - 2.6.6
+
 script:
   - rspec
   - rubocop
diff --git a/mpd_client.gemspec b/mpd_client.gemspec
index 7cee0d3..195c492 100644
--- a/mpd_client.gemspec
+++ b/mpd_client.gemspec
@@ -14,7 +14,7 @@ Gem::Specification.new do |gem|
   gem.files         = `git ls-files`.split($OUTPUT_RECORD_SEPARATOR)
   gem.executables   = gem.files.grep(%r{^bin/}).map { |f| File.basename(f) }
   gem.test_files    = gem.files.grep(%r{^(test|spec|features)/})
-  gem.required_ruby_version = '>= 2.6.0'
+  gem.required_ruby_version = '>= 2.6.6'
   gem.name          = 'mpd_client'
   gem.require_paths = ['lib']
   gem.version       = MPD::Client::VERSION