diff --git a/dnsruby.gemspec b/dnsruby.gemspec
index a618a06..df1bd20 100644
--- a/dnsruby.gemspec
+++ b/dnsruby.gemspec
@@ -15,7 +15,10 @@ SPEC = Gem::Specification.new do |s|
 stub resolver. It aims to comply with all DNS RFCs, including
 DNSSEC NSEC3 support.'
   s.license = "Apache License, Version 2.0"
-  
+
+  # Add explicit Ruby version requirement
+  s.required_ruby_version = '>= 2.8.0'
+
   s.files = `git ls-files -z`.split("\x0")
 
   s.post_install_message = \
diff --git a/lib/dnsruby/config.rb b/lib/dnsruby/config.rb
index 359a46d..6dce381 100644
--- a/lib/dnsruby/config.rb
+++ b/lib/dnsruby/config.rb
@@ -318,11 +318,6 @@ def Config.parse_resolv_conf(filename) #:nodoc: all
         f.each {|line|
           line.sub!(/[#;].*/, '')
           keyword, *args = line.split(/\s+/)
-            if Gem::Version.new(RUBY_VERSION) < Gem::Version.new("2.8")
-              args.each { |arg|
-                arg.untaint
-              }
-            end
           next unless keyword
           case keyword
           when 'port'
diff --git a/lib/dnsruby/hosts.rb b/lib/dnsruby/hosts.rb
index 9d1f11c..479327f 100644
--- a/lib/dnsruby/hosts.rb
+++ b/lib/dnsruby/hosts.rb
@@ -57,19 +57,12 @@ def lazy_initialize# :nodoc:
                 line.sub!(/#.*/, '')
                 addr, hostname, *aliases = line.split(/\s+/)
                 next unless addr
-                if Gem::Version.new(RUBY_VERSION) < Gem::Version.new("2.8")
-                  addr.untaint
-                  hostname.untaint
-                end
                 @addr2name[addr] = [] unless @addr2name.include? addr
                 @addr2name[addr] << hostname
                 @addr2name[addr] += aliases
                 @name2addr[hostname] = [] unless @name2addr.include? hostname
                 @name2addr[hostname] << addr
                 aliases.each {|n|
-                  if Gem::Version.new(RUBY_VERSION) < Gem::Version.new("2.8")
-                    n.untaint
-                  end
                   @name2addr[n] = [] unless @name2addr.include? n
                   @name2addr[n] << addr
                 }