diff --git a/changelog/change_require_rubocop_ast_1_30.md b/changelog/change_require_rubocop_ast_1_30.md
new file mode 100644
index 0000000..3111b78
--- /dev/null
+++ b/changelog/change_require_rubocop_ast_1_30.md
@@ -0,0 +1 @@
+* [#274](https://github.com/rubocop/rubocop-minitest/pull/274): Require RuboCop AST 1.30.0+. ([@koic][])
diff --git a/lib/rubocop/cop/minitest/assert_empty.rb b/lib/rubocop/cop/minitest/assert_empty.rb
index d30828b..90b5914 100644
--- a/lib/rubocop/cop/minitest/assert_empty.rb
+++ b/lib/rubocop/cop/minitest/assert_empty.rb
@@ -22,8 +22,8 @@ class AssertEmpty < Base
         remove_method :on_send
         def on_send(node)
           return unless node.method?(:assert)
-          return unless node.arguments.first.respond_to?(:method?) && node.arguments.first.method?(:empty?)
-          return unless node.arguments.first.arguments.empty?
+          return unless node.first_argument.respond_to?(:method?) && node.first_argument.method?(:empty?)
+          return unless node.first_argument.arguments.empty?
 
           add_offense(node, message: offense_message(node.arguments)) do |corrector|
             autocorrect(corrector, node, node.arguments)
diff --git a/lib/rubocop/cop/minitest/empty_line_before_assertion_methods.rb b/lib/rubocop/cop/minitest/empty_line_before_assertion_methods.rb
index 061fe2e..d6f0297 100644
--- a/lib/rubocop/cop/minitest/empty_line_before_assertion_methods.rb
+++ b/lib/rubocop/cop/minitest/empty_line_before_assertion_methods.rb
@@ -30,7 +30,7 @@ def on_send(node)
           return if node.parent.resbody_type?
           return if accept_previous_line?(previous_line_node, assertion_method)
 
-          previous_line_node = previous_line_node.arguments.last if use_heredoc_argument?(previous_line_node)
+          previous_line_node = previous_line_node.last_argument if use_heredoc_argument?(previous_line_node)
           return if use_assertion_method_at_last_of_block?(previous_line_node)
           return unless no_empty_line?(previous_line_node, assertion_method)
 
@@ -57,7 +57,7 @@ def accept_previous_line?(previous_line_node, node)
         end
 
         def use_heredoc_argument?(node)
-          node.respond_to?(:arguments) && heredoc?(node.arguments.last)
+          node.respond_to?(:arguments) && heredoc?(node.last_argument)
         end
 
         def use_assertion_method_at_last_of_block?(node)
diff --git a/lib/rubocop/cop/minitest/refute_empty.rb b/lib/rubocop/cop/minitest/refute_empty.rb
index eb4bd22..1f864ad 100644
--- a/lib/rubocop/cop/minitest/refute_empty.rb
+++ b/lib/rubocop/cop/minitest/refute_empty.rb
@@ -22,8 +22,8 @@ class RefuteEmpty < Base
         remove_method :on_send
         def on_send(node)
           return unless node.method?(:refute)
-          return unless node.arguments.first.respond_to?(:method?) && node.arguments.first.method?(:empty?)
-          return unless node.arguments.first.arguments.empty?
+          return unless node.first_argument.respond_to?(:method?) && node.first_argument.method?(:empty?)
+          return unless node.first_argument.arguments.empty?
 
           add_offense(node, message: offense_message(node.arguments)) do |corrector|
             autocorrect(corrector, node, node.arguments)
diff --git a/lib/rubocop/cop/mixin/argument_range_helper.rb b/lib/rubocop/cop/mixin/argument_range_helper.rb
index 9593ace..e31e0d2 100644
--- a/lib/rubocop/cop/mixin/argument_range_helper.rb
+++ b/lib/rubocop/cop/mixin/argument_range_helper.rb
@@ -18,7 +18,7 @@ def first_and_second_arguments_range(node)
 
       def all_arguments_range(node)
         first_argument = node.first_argument
-        last_argument = node.arguments.last
+        last_argument = node.last_argument
 
         range_between(first_argument.source_range.begin_pos, last_argument.source_range.end_pos)
       end
diff --git a/rubocop-minitest.gemspec b/rubocop-minitest.gemspec
index ba925cb..c4642c5 100644
--- a/rubocop-minitest.gemspec
+++ b/rubocop-minitest.gemspec
@@ -33,4 +33,5 @@ Gem::Specification.new do |spec|
   spec.require_paths = ['lib']
 
   spec.add_runtime_dependency 'rubocop', '>= 1.39', '< 2.0'
+  spec.add_runtime_dependency 'rubocop-ast', '>= 1.30.0', '< 2.0'
 end