diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 72370ed..7380ff9 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -6,7 +6,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, macos-latest]
-        ruby: [3.0, 3.1, 3.2, 3.3, 3.4]
+        ruby: [3.2, 3.3, 3.4]
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v2
diff --git a/cfpropertylist.gemspec b/cfpropertylist.gemspec
index ba1d4f4..e219d55 100644
--- a/cfpropertylist.gemspec
+++ b/cfpropertylist.gemspec
@@ -13,15 +13,15 @@ Gem::Specification.new do |s|
   #s.autorequire = "name"
   #s.test_files = FileList["{test}/**/*test.rb"].to_a
   s.extra_rdoc_files = ["README.rdoc"]
-  if Gem::Version.new(RUBY_VERSION) >= Gem::Version.new('3.0.0')
-    s.add_runtime_dependency("rexml") # no longer bundled with Ruby 3
-  end
 
-  # Some gems will no longer bundled with Ruby >= 3.4
-  if Gem::Version::new(RUBY_VERSION) >= Gem::Version::new('3.3.0')
-    s.add_runtime_dependency("nkf") 
-    s.add_runtime_dependency("base64")
-  end
+  s.required_ruby_version = Gem::Requirement.new(">= 3.2")
+
+  # no longer bundled with Ruby 3
+  s.add_runtime_dependency("rexml")
+
+  # no longer bundled with Ruby >= 3.4
+  s.add_runtime_dependency("nkf")
+  s.add_runtime_dependency("base64")
 
   s.add_development_dependency("libxml-ruby")
   s.add_development_dependency("minitest")