diff --git a/bcrypt_pbkdf.gemspec b/bcrypt_pbkdf.gemspec
index 6efad82..a6761bc 100644
--- a/bcrypt_pbkdf.gemspec
+++ b/bcrypt_pbkdf.gemspec
@@ -15,6 +15,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'openssl', '~> 3'
   s.add_development_dependency 'rdoc', '~> 6'
   s.add_development_dependency 'rake-compiler-dock', '~> 1.5.0'
+  s.add_development_dependency 'benchmark', '~> 0.4.0'
 
   s.rdoc_options += ['--title', 'bcrypt_pbkdf', '--line-numbers', '--inline-source', '--main', 'README.md']
   s.extra_rdoc_files += ['README.md', 'COPYING', 'CHANGELOG.md', *Dir['lib/**/*.rb']]
diff --git a/test/bcrypt_pnkdf/engine_test.rb b/test/bcrypt_pnkdf/engine_test.rb
index e14f591..837f74f 100644
--- a/test/bcrypt_pnkdf/engine_test.rb
+++ b/test/bcrypt_pnkdf/engine_test.rb
@@ -71,7 +71,15 @@ def table
     [
       ["pass2", "salt2", 12, 2, [214, 14, 48, 162, 131, 206, 121, 176, 50, 104, 231, 252]],
       ["\u0000\u0001foo", "\u0001\u0002fooo3", 14, 5, [46, 189, 32, 185, 94, 85, 232, 10, 84, 26, 44, 161, 49, 126]],
-      ["doozoasd", "fooo$AS!", 14, 22, [57, 62, 50, 107, 70, 155, 65, 5, 129, 211, 189, 169, 188, 65]]
+      ["doozoasd", "fooo$AS!", 14, 22, [57, 62, 50, 107, 70, 155, 65, 5, 129, 211, 189, 169, 188, 65]],
+      # vectors from jBCrypt (https://github.com/kruton/jbcrypt) by Kenny Root
+      ["password", "salt", 32, 4,  [0x5b, 0xbf, 0x0c, 0xc2, 0x93, 0x58, 0x7f, 0x1c, 0x36, 0x35, 0x55, 0x5c, 0x27, 0x79, 0x65, 0x98,
+                                    0xd4, 0x7e, 0x57, 0x90, 0x71, 0xbf, 0x42, 0x7e, 0x9d, 0x8f, 0xbe, 0x84, 0x2a, 0xba, 0x34, 0xd9]],
+      ["password", "salt", 64, 8,  [0xe1, 0x36, 0x7e, 0xc5, 0x15, 0x1a, 0x33, 0xfa, 0xac, 0x4c, 0xc1, 0xc1, 0x44, 0xcd, 0x23, 0xfa,
+                                    0x15, 0xd5, 0x54, 0x84, 0x93, 0xec, 0xc9, 0x9b, 0x9b, 0x5d, 0x9c, 0x0d, 0x3b, 0x27, 0xbe, 0xc7,
+                                    0x62, 0x27, 0xea, 0x66, 0x08, 0x8b, 0x84, 0x9b, 0x20, 0xab, 0x7a, 0xa4, 0x78, 0x01, 0x02, 0x46,
+                                    0xe7, 0x4b, 0xba, 0x51, 0x72, 0x3f, 0xef, 0xa9, 0xf9, 0x47, 0x4d, 0x65, 0x08, 0x84, 0x5e, 0x8d]],
+      ["password", "salt", 16, 42, [0x83, 0x3c, 0xf0, 0xdc, 0xf5, 0x6d, 0xb6, 0x56, 0x08, 0xe8, 0xf0, 0xdc, 0x0c, 0xe8, 0x82, 0xbd]],
     ]
   end
 end