diff --git a/lib/rubocop/ast/processed_source.rb b/lib/rubocop/ast/processed_source.rb
index 566e5d343..66656d71e 100644
--- a/lib/rubocop/ast/processed_source.rb
+++ b/lib/rubocop/ast/processed_source.rb
@@ -41,7 +41,7 @@ def initialize(source, ruby_version, path = nil)
       def ast_with_comments
         return if !ast || !comments
 
-        @ast_with_comments ||= Parser::Source::Comment.associate(ast, comments)
+        @ast_with_comments ||= Parser::Source::Comment.associate_by_identity(ast, comments)
       end
 
       # Returns the source lines, line break characters removed, excluding a
diff --git a/rubocop-ast.gemspec b/rubocop-ast.gemspec
index 607954c68..2151cf112 100644
--- a/rubocop-ast.gemspec
+++ b/rubocop-ast.gemspec
@@ -32,7 +32,7 @@ Gem::Specification.new do |s|
     'bug_tracker_uri' => 'https://github.com/rubocop-hq/rubocop-ast/issues'
   }
 
-  s.add_runtime_dependency('parser', '>= 2.7.1.5')
+  s.add_runtime_dependency('parser', '>= 3.0.1.1')
 
   s.add_development_dependency('bundler', '>= 1.15.0', '< 3.0')