diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 691241a..be18252 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -7,12 +7,10 @@ jobs:
       matrix:
         ruby-version:
           - 2.0
-          - 2.5
-          - 2.6
           - 2.7
           - 3.0
+          - 3.4
           - ruby-head
-          - jruby-9.1
           - jruby-head
     name: Ruby ${{ matrix.ruby-version }} sample
     steps:
diff --git a/detect_language.gemspec b/detect_language.gemspec
index 47d2552..ccdcdea 100644
--- a/detect_language.gemspec
+++ b/detect_language.gemspec
@@ -8,7 +8,9 @@ Gem::Specification.new do |gem|
   gem.summary       = %q{Detects language of given text. Returns detected language codes and scores.}
   gem.homepage      = "https://github.com/detectlanguage/detectlanguage-ruby"
 
-  gem.files         = `git ls-files`.split($\)
+  gem.files         = %w(LICENSE README.md detect_language.gemspec)
+  gem.files         += Dir.glob('lib/**/*.{rb}')
+
   gem.executables   = gem.files.grep(%r{^bin/}).map{ |f| File.basename(f) }
   gem.test_files    = gem.files.grep(%r{^(test|spec|features)/})
   gem.name          = "detect_language"
diff --git a/mise.toml b/mise.toml
new file mode 100644
index 0000000..c85867a
--- /dev/null
+++ b/mise.toml
@@ -0,0 +1,2 @@
+[tools]
+ruby = "3.4.5"