diff --git a/live_ast.gemspec b/live_ast.gemspec
index cbf58fb..9a05a35 100644
--- a/live_ast.gemspec
+++ b/live_ast.gemspec
@@ -38,7 +38,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "rake", "~> 13.0"
   spec.add_development_dependency "rake-manifest", "~> 0.2.0"
   spec.add_development_dependency "rubocop", "~> 1.51"
-  spec.add_development_dependency "rubocop-minitest", "~> 0.33.0"
+  spec.add_development_dependency "rubocop-minitest", "~> 0.34.2"
   spec.add_development_dependency "rubocop-packaging", "~> 0.5.2"
   spec.add_development_dependency "rubocop-performance", "~> 1.20"
   spec.add_development_dependency "rubocop-rake", "~> 0.6.0"
diff --git a/test/flush_cache_test.rb b/test/flush_cache_test.rb
index 9ced0ab..81fd9de 100644
--- a/test/flush_cache_test.rb
+++ b/test/flush_cache_test.rb
@@ -61,8 +61,7 @@ def g ; end
 
     LiveAST.flush_cache
 
-    assert_equal f_ast.object_id,
-                 klass.instance_method(:f).to_ast.object_id
+    assert_same f_ast, klass.instance_method(:f).to_ast
 
     assert_raises LiveAST::ASTNotFoundError do
       klass.instance_method(:g).to_ast
@@ -96,7 +95,7 @@ def flush_lambda
 
     LiveAST.flush_cache
 
-    assert_equal a_ast.object_id, a.to_ast.object_id
+    assert_same a_ast, a.to_ast
 
     assert_raises LiveAST::ASTNotFoundError do
       b.to_ast
diff --git a/test/test_helper.rb b/test/test_helper.rb
index b7b10ef..d926ec5 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -42,7 +42,7 @@ def assert_nothing_raised
     empty equal in_delta in_epsilon includes instance_of
     kind_of match nil operator respond_to same
   ).each { |name|
-    alias_method :"assert_not_#{name}", "refute_#{name}"
+    alias_method :"assert_not_#{name}", :"refute_#{name}"
   }
 end