Gemfile in fast_excel-0.1.7 vs Gemfile in fast_excel-0.2.0

@@ -1,9 +1,15 @@
 source 'https://rubygems.org'
 
 gem 'ffi'
-gem 'ffi_gen'
-gem 'axlsx'
+gem 'ffi_gen', require: false
 
-gem 'roo'
+gem 'roo', '2.7.1', git: 'https://github.com/roo-rb/roo.git'
+
 gem 'minitest'
-gem 'minitest-reporters'
\ No newline at end of file
+gem 'minitest-reporters'
+
+# For benchmakrs
+gem 'axlsx', git: 'https://github.com/randym/axlsx.git'
+gem 'write_xlsx'
+gem 'benchmark-ips'
+gem 'process_memory', git: 'https://github.com/paxa/process_memory'