diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index bf48e4b9..8c975c17 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -8,11 +8,15 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, macos-latest]
-        ruby: ['3.1', '3.2', 'head']
+        ruby: ['3.1', '3.2', '3.3', 'head']
 
     name: >-
       ${{matrix.os}}, ${{matrix.ruby}}
 
+    concurrency:
+      group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}-${{matrix.os}}-${{matrix.ruby}}-libev
+      cancel-in-progress: true
+
     runs-on: ${{matrix.os}}
 
     env:
@@ -20,7 +24,7 @@ jobs:
 
     steps:
     - name: Setup machine
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
     - name: Setup Ruby
       uses: ruby/setup-ruby@v1
       with:
diff --git a/.github/workflows/test_io_uring.yml b/.github/workflows/test_io_uring.yml
index b7d3afcf..7b945d22 100644
--- a/.github/workflows/test_io_uring.yml
+++ b/.github/workflows/test_io_uring.yml
@@ -8,15 +8,20 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest]
-        ruby: ['3.1', '3.2', 'head']
+        ruby: ['3.1', '3.2', '3.3', 'head']
 
     name: >-
       ${{matrix.os}}, ${{matrix.ruby}}
 
+    concurrency:
+      group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}-${{matrix.os}}-${{matrix.ruby}}-io_uring
+      cancel-in-progress: true
+
     runs-on: ${{matrix.os}}
+
     steps:
     - name: Checkout repository and submodules
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         submodules: recursive
     - name: Setup Ruby
diff --git a/.rubocop.yml b/.rubocop.yml
index c27956f9..cfcc79f5 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -1,5 +1,5 @@
 AllCops:
-  TargetRubyVersion: 3.2
+  TargetRubyVersion: 3.3
   RubyInterpreters:
     - ruby
   Exclude:
@@ -9,6 +9,7 @@ AllCops:
     - 'Gemfile*'
     - 'ext/**/*.rb'
     - lib/polyphony/adapters/irb.rb
+  NewCops: enable
 
 Style/LambdaCall:
   Enabled: false
@@ -202,4 +203,4 @@ Style/SlicingWithRange:
 
 Style/RaiseArgs:
   Exclude:
-    - lib/polyphony/extensions/fiber.rb
\ No newline at end of file
+    - lib/polyphony/extensions/fiber.rb
diff --git a/README.md b/README.md
index 4a6af0e9..cc3b68de 100644
--- a/README.md
+++ b/README.md
@@ -23,7 +23,7 @@
 ## What is Polyphony?
 
 Polyphony is a library for building concurrent applications in Ruby. Polyphony
-harnesses the power of [Ruby fibers](https://rubyapi.org/3.2/o/fiber) to provide
+harnesses the power of [Ruby fibers](https://rubyapi.org/3.3/o/fiber) to provide
 a cooperative, sequential coroutine-based concurrency model. Under the hood,
 Polyphony uses [io_uring](https://unixism.net/loti/what_is_io_uring.html) or
 [libev](https://github.com/enki/libev) to maximize I/O performance.
diff --git a/docs/advanced-io.md b/docs/advanced-io.md
index 7de4d4d0..22919645 100644
--- a/docs/advanced-io.md
+++ b/docs/advanced-io.md
@@ -119,7 +119,7 @@ minimizing memory use and GC pressure.
 ## Compressing and decompressing in-flight data
 
 You might be familiar with Ruby's [zlib](https://github.com/ruby/zlib) gem (docs
-[here](https://rubyapi.org/3.2/o/zlib)), which can be used to compress and
+[here](https://rubyapi.org/3.3/o/zlib)), which can be used to compress and
 uncompress data using the popular gzip format. Imagine we want to implement an
 HTTP server that can serve files compressed using gzip:
 
@@ -318,4 +318,4 @@ provided by Polyphony, which lets us write less code, have it run faster, have
 it run concurrently, and minimize memory allocations and pressure on the Ruby
 GC. Feel free to browse the [IO
 examples](https://github.com/digital-fabric/polyphony/tree/master/examples/io)
-included in Polyphony.
\ No newline at end of file
+included in Polyphony.
diff --git a/docs/readme.md b/docs/readme.md
index ac8b8afb..47a6feb8 100644
--- a/docs/readme.md
+++ b/docs/readme.md
@@ -25,7 +25,7 @@
 ## What is Polyphony?
 
 Polyphony is a library for building concurrent applications in Ruby. Polyphony
-harnesses the power of [Ruby fibers](https://rubyapi.org/3.2/o/fiber) to provide
+harnesses the power of [Ruby fibers](https://rubyapi.org/3.3/o/fiber) to provide
 a cooperative, sequential coroutine-based concurrency model. Under the hood,
 Polyphony uses [io_uring](https://unixism.net/loti/what_is_io_uring.html) or
 [libev](https://github.com/enki/libev) to maximize I/O performance.
diff --git a/lib/polyphony/core/resource_pool.rb b/lib/polyphony/core/resource_pool.rb
index 4613f8bd..a1f997de 100644
--- a/lib/polyphony/core/resource_pool.rb
+++ b/lib/polyphony/core/resource_pool.rb
@@ -56,9 +56,10 @@ def acquire(&block)
     #
     # @param sym [Symbol] method name
     # @param args [Array<any>] method arguments
+    # @param kwargs [Hash] keyword arguments
     # @return [any] result of method call
-    def method_missing(sym, *args, &block)
-      acquire { |r| r.send(sym, *args, &block) }
+    def method_missing(sym, *args, **kwargs, &block)
+      acquire { |r| r.send(sym, *args, **kwargs, &block) }
     end
 
     # @!visibility private
diff --git a/lib/polyphony/extensions/io.rb b/lib/polyphony/extensions/io.rb
index dbf315fb..ab2b0570 100644
--- a/lib/polyphony/extensions/io.rb
+++ b/lib/polyphony/extensions/io.rb
@@ -27,20 +27,17 @@ def binwrite(name, string, offset = nil)
       end
     end
 
-    # @!visibility private
-    EMPTY_HASH = {}.freeze
-
     # @!visibility private
     alias_method :orig_foreach, :foreach
 
     # @!visibility private
-    def foreach(name, sep = $/, limit = nil, getline_args = EMPTY_HASH, &block)
+    def foreach(name, sep = $/, limit = nil, **kwargs, &block)
       if sep.is_a?(Integer)
         sep = $/
         limit = sep
       end
       File.open(name, 'r') do |f|
-        f.each_line(sep, limit, chomp: getline_args[:chomp], &block)
+        f.each_line(sep, limit, chomp: kwargs[:chomp], &block)
       end
     end
 
@@ -48,21 +45,21 @@ def foreach(name, sep = $/, limit = nil, getline_args = EMPTY_HASH, &block)
     alias_method :orig_read, :read
 
     # @!visibility private
-    def read(name, length = nil, offset = nil, opt = EMPTY_HASH)
+    def read(name, length = nil, offset = nil, **kwargs)
       if length.is_a?(Hash)
-        opt = length
+        kwargs = length
         length = nil
       end
-      File.open(name, opt[:mode] || 'r') do |f|
+      File.open(name, kwargs[:mode] || 'r') do |f|
         f.seek(offset) if offset
         length ? f.read(length) : f.read
       end
     end
 
     alias_method :orig_readlines, :readlines
-    def readlines(name, sep = $/, limit = nil, getline_args = EMPTY_HASH)
+    def readlines(name, sep = $/, limit = nil, **kwargs)
       File.open(name, 'r') do |f|
-        f.readlines(sep, **getline_args)
+        f.readlines(sep, **kwargs)
       end
     end
 
@@ -70,8 +67,8 @@ def readlines(name, sep = $/, limit = nil, getline_args = EMPTY_HASH)
     alias_method :orig_write, :write
 
     # @!visibility private
-    def write(name, string, offset = nil, opt = EMPTY_HASH)
-      File.open(name, opt[:mode] || 'w') do |f|
+    def write(name, string, offset = nil, **kwargs)
+      File.open(name, kwargs[:mode] || 'w') do |f|
         f.seek(offset) if offset
         f.write(string)
       end
diff --git a/polyphony.gemspec b/polyphony.gemspec
index 2a27afce..2c851b4b 100644
--- a/polyphony.gemspec
+++ b/polyphony.gemspec
@@ -20,15 +20,21 @@ Gem::Specification.new do |s|
   s.require_paths = ["lib"]
   s.required_ruby_version = '>= 3.1'
 
-  s.add_development_dependency  'rake-compiler',        '1.2.1'
-  s.add_development_dependency  'minitest',             '5.17.0'
+  s.add_development_dependency  'rake-compiler',        '1.2.7'
+  s.add_development_dependency  'minitest',             '5.22.3'
   s.add_development_dependency  'simplecov',            '0.22.0'
-  s.add_development_dependency  'rubocop',              '1.45.1'
+  s.add_development_dependency  'rubocop',              '1.62.1'
   s.add_development_dependency  'pry',                  '0.14.2'
 
-  s.add_development_dependency  'msgpack',              '1.6.0'
+  s.add_development_dependency  'msgpack',              '1.7.2'
   s.add_development_dependency  'httparty',             '0.21.0'
-  s.add_development_dependency  'localhost',            '1.1.10'
-  s.add_development_dependency  'debug',                '1.8.0'
-  s.add_development_dependency  'benchmark-ips',        '2.10.0'
+  s.add_development_dependency  'localhost',            '1.2.0'
+  s.add_development_dependency  'debug',                '1.9.1'
+  s.add_development_dependency  'benchmark-ips',        '2.13.0'
+
+  # FIXME: remove gems when all other dependencies have bundled them (not part of stdlib since Ruby 3.4)
+  s.add_development_dependency  'base64',               '0.2.0'
+  s.add_development_dependency  'bigdecimal',           '3.1.7'
+  s.add_development_dependency  'csv',                  '3.3.0'
+  s.add_development_dependency  'mutex_m',              '0.2.0'
 end
diff --git a/test/helper.rb b/test/helper.rb
index 6d6ae3a8..008b9f67 100644
--- a/test/helper.rb
+++ b/test/helper.rb
@@ -11,6 +11,7 @@
 require_relative './eg'
 
 require 'minitest/autorun'
+require 'minitest/unit'
 
 ::Exception.__disable_sanitized_backtrace__ = true
 
@@ -44,6 +45,14 @@ def format_trace(args)
   def monotonic_clock
     ::Process.clock_gettime(::Process::CLOCK_MONOTONIC)
   end
+
+  def inspect_method_name_for(klass_name, method_name)
+    if RUBY_VERSION < '3.4.0'
+      "`#{method_name}'"
+    else
+      "'#{klass_name}##{method_name}'"
+    end
+  end
 end
 
 class MiniTest::Test
diff --git a/test/test_fiber.rb b/test/test_fiber.rb
index 3657ea4d..e4c85479 100644
--- a/test/test_fiber.rb
+++ b/test/test_fiber.rb
@@ -619,7 +619,7 @@ def test_inspect
     f = spin(:baz) { :foo }
 
     expected = format(
-      '#<Fiber baz:%s %s:%d:in `test_inspect\' (runnable)>',
+      "#<Fiber baz:%s %s:%d:in #{inspect_method_name_for(self.class.name, __method__.to_s)} (runnable)>",
       f.object_id,
       __FILE__,
       spin_line_no
@@ -627,8 +627,9 @@ def test_inspect
     assert_equal expected, f.inspect
 
     f.await
+
     expected = format(
-      '#<Fiber baz:%s %s:%d:in `test_inspect\' (dead)>',
+      "#<Fiber baz:%s %s:%d:in #{inspect_method_name_for(self.class.name, __method__.to_s)} (dead)>",
       f.object_id,
       __FILE__,
       spin_line_no
diff --git a/test/test_thread.rb b/test/test_thread.rb
index 21b434c1..72d9649f 100644
--- a/test/test_thread.rb
+++ b/test/test_thread.rb
@@ -133,7 +133,7 @@ def test_that_suspend_returns_immediately_if_no_watchers
     Thread.backend.trace_proc = proc {|*r| records << r }
     suspend
     assert_equal [
-      [:block, Fiber.current, ["#{__FILE__}:#{__LINE__ - 2}:in `test_that_suspend_returns_immediately_if_no_watchers'"] + caller]
+      [:block, Fiber.current, ["#{__FILE__}:#{__LINE__ - 2}:in #{inspect_method_name_for(self.class.name, __method__.to_s)}"] + caller]
     ], records
   ensure
     Thread.backend.trace_proc = nil