diff --git a/README.md b/README.md
index dbe4e21..f2eecbc 100644
--- a/README.md
+++ b/README.md
@@ -244,7 +244,7 @@ Available options:
 
 - [json](https://rubygems.org/gems/json)
 - [extlz4](https://rubygems.org/gems/extlz4)
-- [extlzma](https://rubygems.org/gems/extlzma)
+- [extlzma2](https://rubygems.org/gems/extlzma2)
 - [bin_utils](https://rubygems.org/gems/bin_utils)
 - [chunky_png](https://rubygems.org/gems/chunky_png)
 
diff --git a/Rakefile b/Rakefile
index 959de4d..f01eaca 100644
--- a/Rakefile
+++ b/Rakefile
@@ -12,11 +12,9 @@ task build: :compile
 ext_dirs = %w[decoders/native decoders/crunch]
 
 ext_dirs.each do |dir|
-  Rake::ExtensionTask.new(dir) do |ext|
-    ext.lib_dir = 'lib/mikunyan'
-  end
+  Rake::ExtensionTask.new(dir)
 end
 
-task compile: ext_dirs.map{|e| "compile:#{e}".to_sym}
+task compile: ext_dirs.map {|e| "compile:#{e}".to_sym}
 
 task default: %i[clobber compile spec]
diff --git a/ext/decoders/crunch/extconf.rb b/ext/decoders/crunch/extconf.rb
index 8da9927..28934c3 100644
--- a/ext/decoders/crunch/extconf.rb
+++ b/ext/decoders/crunch/extconf.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'mkmf'
 
 have_library('stdc++')
@@ -6,4 +8,5 @@ append_cppflags('-O2')
 append_cppflags('-Wall')
 append_cppflags('-Wextra')
 append_cppflags('-Wvla')
-create_makefile('mikunyan/decoders/crunch')
+
+create_makefile('decoders/crunch')
diff --git a/ext/decoders/native/extconf.rb b/ext/decoders/native/extconf.rb
index 0a35626..5b4c04d 100644
--- a/ext/decoders/native/extconf.rb
+++ b/ext/decoders/native/extconf.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'mkmf'
 
 append_cppflags('-std=c11')
@@ -5,4 +7,5 @@ append_cppflags('-O2')
 append_cppflags('-Wall')
 append_cppflags('-Wextra')
 append_cppflags('-Wvla')
-create_makefile('mikunyan/decoders/native')
+
+create_makefile('decoders/native')
diff --git a/lib/mikunyan/asset_bundle.rb b/lib/mikunyan/asset_bundle.rb
index a372b82..21428d5 100644
--- a/lib/mikunyan/asset_bundle.rb
+++ b/lib/mikunyan/asset_bundle.rb
@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 require 'extlz4'
-require 'extlzma'
+require 'extlzma2'
 require 'mikunyan/asset'
 require 'mikunyan/binary_reader'
 
diff --git a/mikunyan.gemspec b/mikunyan.gemspec
index cbc6b15..57fba90 100644
--- a/mikunyan.gemspec
+++ b/mikunyan.gemspec
@@ -14,20 +14,20 @@ Gem::Specification.new do |spec|
   spec.description   = 'Library to deserialize Unity assetbundles and assets.'
   spec.homepage      = 'https://github.com/Ishotihadus/mikunyan'
   spec.license       = 'MIT'
+  spec.required_ruby_version = '>= 2.6.0'
 
-  spec.files         = `git ls-files -z`.split("\x0").reject do |f|
+  spec.files = `git ls-files -z`.split("\x0").reject do |f|
     f.match(%r{^(test|spec|features)/})
   end
   spec.bindir        = 'exe'
-  spec.executables   = spec.files.grep(%r{^exe/}){|f| File.basename(f)}
+  spec.executables   = spec.files.grep(%r{^exe/}) {|f| File.basename(f)}
   spec.require_paths = ['lib']
   spec.extensions    = ['ext/decoders/native/extconf.rb', 'ext/decoders/crunch/extconf.rb']
 
   spec.add_dependency 'bin_utils', '~> 0'
   spec.add_dependency 'chunky_png', '~> 1'
   spec.add_dependency 'extlz4', '~> 0'
-  spec.add_dependency 'extlzma', '~> 0'
-  spec.add_dependency 'json', '~> 2'
+  spec.add_dependency 'extlzma2', '~> 2'
 
   spec.add_development_dependency 'bundler', '~> 2'
   spec.add_development_dependency 'oily_png', '~> 1'