diff --git a/.rubocop.yml b/.rubocop.yml
index 62416515..02b83353 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -5,7 +5,7 @@ AllCops:
     - '**/*.rake'
     - 'Gemfile'
     - 'Gemfile.triage'
-  TargetRubyVersion: 3.1
+  TargetRubyVersion: 3.2
   Exclude:
     - tmp/**/*
     - vendor/**/*
diff --git a/bin/corpus b/bin/corpus
index b7dc73f9..651572a4 100755
--- a/bin/corpus
+++ b/bin/corpus
@@ -197,8 +197,8 @@ module Unparser
 
     # Unparser corpus CLI implementation
     class CLI
-      def self.run(*arguments)
-        new(*arguments).exit_status
+      def self.run(*)
+        new(*).exit_status
       end
 
       def initialize(arguments)
diff --git a/lib/unparser.rb b/lib/unparser.rb
index 5616f888..9dba8d95 100644
--- a/lib/unparser.rb
+++ b/lib/unparser.rb
@@ -3,7 +3,6 @@
 require 'diff/lcs'
 require 'diff/lcs/hunk'
 require 'optparse'
-require 'set'
 
 require 'unparser/equalizer'
 require 'unparser/adamantium'
diff --git a/lib/unparser/ast/local_variable_scope.rb b/lib/unparser/ast/local_variable_scope.rb
index 8edaf10e..ca2782c2 100644
--- a/lib/unparser/ast/local_variable_scope.rb
+++ b/lib/unparser/ast/local_variable_scope.rb
@@ -107,8 +107,8 @@ def initialize(stack:)
       end
 
       # Enumerate each node with its local variable scope
-      def self.each(node:, stack:, &block)
-        new(stack: stack).each(node: node, &block)
+      def self.each(node:, stack:, &)
+        new(stack: stack).each(node: node, &)
       end
 
       # Enumerate local variable scope scope
@@ -121,8 +121,8 @@ def self.each(node:, stack:, &block)
       #
       # @api private
       #
-      def each(node:, &block)
-        visit(node, &block)
+      def each(node:, &)
+        visit(node, &)
       end
 
     private
diff --git a/lib/unparser/cli.rb b/lib/unparser/cli.rb
index 36402026..7a155990 100644
--- a/lib/unparser/cli.rb
+++ b/lib/unparser/cli.rb
@@ -63,8 +63,8 @@ def literal_validation
     # @api private
     #
     # mutant:disable
-    def self.run(*arguments)
-      new(*arguments).exit_status
+    def self.run(*)
+      new(*).exit_status
     end
 
     # Initialize object
diff --git a/lib/unparser/comments.rb b/lib/unparser/comments.rb
index 5a7696bd..9234b88c 100644
--- a/lib/unparser/comments.rb
+++ b/lib/unparser/comments.rb
@@ -15,8 +15,8 @@ class Comments
     #
     # @api private
     #
-    def source_range(*arguments)
-      self.class.source_range(*arguments)
+    def source_range(*)
+      self.class.source_range(*)
     end
 
     # Initialize object
diff --git a/spec/unit/unparser_spec.rb b/spec/unit/unparser_spec.rb
index a2499ee1..be2a082a 100644
--- a/spec/unit/unparser_spec.rb
+++ b/spec/unit/unparser_spec.rb
@@ -475,7 +475,7 @@ def foo(bar)
         )
       end
 
-      if RUBY_VERSION < '3.1.'
+      if RUBY_VERSION < '3.2.'
         excludes.concat(
           %w[
             test/corpus/literal/since/31.rb
diff --git a/unparser.gemspec b/unparser.gemspec
index 7c0ac193..3edbc02c 100644
--- a/unparser.gemspec
+++ b/unparser.gemspec
@@ -23,7 +23,7 @@ Gem::Specification.new do |gem|
   gem.extra_rdoc_files = %w[README.md]
   gem.executables      = %w[unparser]
 
-  gem.required_ruby_version = '>= 3.1'
+  gem.required_ruby_version = '>= 3.2'
 
   gem.add_dependency('diff-lcs', '~> 1.6')
   gem.add_dependency('parser',   '>= 3.3.0')