diff --git a/Gemfile b/Gemfile
index d1e1dd3..45ab5d2 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,4 +1,6 @@
 source "https://rubygems.org"
 
+gem "utensils", github: "cookpad/utensils"
+
 # Specify your gem's dependencies in streamy.gemspec
 gemspec
diff --git a/lib/streamy/helpers/have_hash_matcher.rb b/lib/streamy/helpers/have_hash_matcher.rb
deleted file mode 100644
index d09e59a..0000000
--- a/lib/streamy/helpers/have_hash_matcher.rb
+++ /dev/null
@@ -1,55 +0,0 @@
-RSpec::Matchers.define :have_hash do |expected|
-  match do |array|
-    synchronize do
-      hash = find_hash(array, expected)
-
-      expect(hash).to include(expected)
-      expect(hash).to_not include(@unexpected_keys)
-    end
-  end
-
-  chain :without do |*unexpected_keys|
-    @unexpected_keys = unexpected_keys
-  end
-
-  failure_message do
-    @failure_message
-  end
-
-  private
-
-    def find_hash(array, expected)
-      hash = array.reverse.find do |item|
-        find_with_inclusion(item, expected)
-      end
-
-      hash || better_diff(array)
-    end
-
-    def find_with_inclusion(hash, expected)
-      expect(hash).to include(expected)
-    rescue RSpec::Expectations::ExpectationNotMetError
-    end
-
-    def better_diff(array)
-      return array if array.size > 1
-
-      array.first
-    end
-
-    # mimicking has_text/css? matchers, https://git.io/vMSo9
-    def synchronize(&block)
-      start_time = Time.current
-
-      begin
-        yield
-      rescue ::RSpec::Expectations::ExpectationNotMetError => e
-        @failure_message = e.message
-        raise(e) unless Capybara.current_driver == Capybara.javascript_driver
-
-        return false if (Time.current - start_time) >= Capybara.default_max_wait_time
-        sleep 0.05
-        retry
-      end
-    end
-end
diff --git a/lib/streamy/helpers/rspec_helper.rb b/lib/streamy/helpers/rspec_helper.rb
index 39b8df0..4b43617 100644
--- a/lib/streamy/helpers/rspec_helper.rb
+++ b/lib/streamy/helpers/rspec_helper.rb
@@ -1,4 +1,4 @@
-require "streamy/helpers/have_hash_matcher"
+require "utensils/have_hash_matcher"
 require "streamy/test_dispatcher"
 
 module Streamy
diff --git a/streamy.gemspec b/streamy.gemspec
index 2e5fc17..dd7bff7 100644
--- a/streamy.gemspec
+++ b/streamy.gemspec
@@ -40,6 +40,7 @@ Gem::Specification.new do |spec| # rubocop:disable Metrics/BlockLength
   spec.add_development_dependency "rake", ">= 12.3.3"
   spec.add_development_dependency "rspec"
   spec.add_development_dependency "sinatra"
+  spec.add_development_dependency "utensils"
 
   spec.add_dependency "activesupport", ">= 5.2"
   spec.add_dependency "avro_turf", "~> 1.3.0"