diff --git a/README.md b/README.md
index ce3cced..3da20e1 100755
--- a/README.md
+++ b/README.md
@@ -25,11 +25,11 @@ require 'blake2b'
 input   = 'abc'
 
 # The main application of keyed BLAKE2 is as a message authentication code (MAC)
-# By default `Blake2::Key.none` is used.
+# By default `Blake2b::Key.none` is used.
 key = Blake2b::Key.none
-# key = Blake2::Key.from_string("foo bar baz")
-# key = Blake2::Key.from_hex('DEADBEAF')
-# key = Blake2::Key.from_bytes([222, 173, 190, 175])
+# key = Blake2b::Key.from_string("foo bar baz")
+# key = Blake2b::Key.from_hex('DEADBEAF')
+# key = Blake2b::Key.from_bytes([222, 173, 190, 175])
 
 # The output length in Bytes of the Hash, Max and Default is 32.
 out_len = 32
diff --git a/blake2b.gemspec b/blake2b.gemspec
index acfe0bd..bc96003 100755
--- a/blake2b.gemspec
+++ b/blake2b.gemspec
@@ -12,7 +12,7 @@ Gem::Specification.new do |spec|
   spec.description = "A cryptographic hash function faster than MD5, SHA-1, SHA-2, and SHA-3 for 64-bit systems."
   spec.files       = `git ls-files -z`.split("\x0").reject { |f| f.match(%r{^(test|spec|features)/}) }
 
-  spec.extensions << "ext/blake2_ext/extconf.rb"
+  spec.extensions << "ext/blake2b_ext/extconf.rb"
 
   spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
   spec.require_paths = ["lib"]
@@ -20,6 +20,5 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "rake-compiler", "~> 0.9"
   spec.add_development_dependency "bundler"      , "~> 1.5"
   spec.add_development_dependency "rake"         , "~> 11.1"
-  spec.add_development_dependency "minitest"     , "~> 5.8"
-  spec.add_development_dependency "pry"          , "~> 0.10"
+  spec.add_development_dependency "minitest"     , "~> 5.11"
 end
diff --git a/lib/blake2b.rb b/lib/blake2b.rb
index 907bc1a..772fcc4 100755
--- a/lib/blake2b.rb
+++ b/lib/blake2b.rb
@@ -2,12 +2,12 @@ require 'blake2b_ext'
 require 'blake2b/key'
 
 class Blake2b
-  def self.hex(input, key = Blake2::Key.none, out_len = 32)
+  def self.hex(input, key = Blake2b::Key.none, out_len = 32)
     check_if_valid!(input, key, out_len)
     Blake2b.new(out_len, key).digest(input, :to_hex)
   end
 
-  def self.bytes(input, key = Blake2::Key.none, out_len = 32)
+  def self.bytes(input, key = Blake2b::Key.none, out_len = 32)
     check_if_valid!(input, key, out_len)
     Blake2b.new(out_len, key).digest(input, :to_bytes)
   end
@@ -17,7 +17,7 @@ class Blake2b
       raise ArgumentError, 'input arg must be a String'
     end
 
-    unless key.is_a?(Blake2::Key)
+    unless key.is_a?(Blake2b::Key)
       raise ArgumentError, 'key arg must be a Blake2b::Key'
     end