diff --git a/changelog/new_support_ruby_3_4_parser.md b/changelog/new_support_ruby_3_4_parser.md
new file mode 100644
index 000000000..f29e785e9
--- /dev/null
+++ b/changelog/new_support_ruby_3_4_parser.md
@@ -0,0 +1 @@
+* [#276](https://github.com/rubocop-hq/rubocop-ast/pull/276): Support `Parser::Ruby34` for Ruby 3.4 parser (experimental). ([@koic][])
diff --git a/lib/rubocop/ast/processed_source.rb b/lib/rubocop/ast/processed_source.rb
index c79a98aec..9a9a5bd29 100644
--- a/lib/rubocop/ast/processed_source.rb
+++ b/lib/rubocop/ast/processed_source.rb
@@ -268,6 +268,9 @@ def parser_class(ruby_version)
         when 3.3
           require 'parser/ruby33'
           Parser::Ruby33
+        when 3.4
+          require 'parser/ruby34'
+          Parser::Ruby34
         else
           raise ArgumentError,
                 "RuboCop found unknown Ruby version: #{ruby_version.inspect}"
diff --git a/rubocop-ast.gemspec b/rubocop-ast.gemspec
index 44f6054ef..4f820ade2 100644
--- a/rubocop-ast.gemspec
+++ b/rubocop-ast.gemspec
@@ -33,7 +33,7 @@ Gem::Specification.new do |s|
     'rubygems_mfa_required' => 'true'
   }
 
-  s.add_runtime_dependency('parser', '>= 3.2.1.0')
+  s.add_runtime_dependency('parser', '>= 3.3.0.4')
 
   ##### Do NOT add `rubocop` (or anything depending on `rubocop`) here. See Gemfile
 end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 06f0e1e16..b4bb88634 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -55,6 +55,10 @@
   let(:ruby_version) { 3.3 }
 end
 
+RSpec.shared_context 'ruby 3.4', :ruby34 do
+  let(:ruby_version) { 3.4 }
+end
+
 # ...
 module DefaultRubyVersion
   extend RSpec::SharedContext