diff --git a/README.md b/README.md
index a0c33fa..94171e2 100644
--- a/README.md
+++ b/README.md
@@ -140,6 +140,7 @@ Use the `column_defaults` method to specify the value to set when the correspond
 - `column_defaults 0 => 0.0, 1 => 0.0, 3 => "UNKNOWN"`
 - `column_defaults [0.0, 0.0, "UNKNOWN"]`
 - `column_defaults 0.0, 0.0, "UNKNOWN"`
+
 The `column_defaults` macro overwrite the read/validate `:force_nil` option.
 
 Aside from define the columns settings, into block you define the validation rules. 
diff --git a/goodsheet.gemspec b/goodsheet.gemspec
index b274536..e8b2286 100644
--- a/goodsheet.gemspec
+++ b/goodsheet.gemspec
@@ -23,7 +23,8 @@ Gem::Specification.new do |spec|
   # spec.add_development_dependency "bundler", "~> 1.4"
   spec.add_development_dependency "rake"
 
-  spec.add_dependency('roo', '>= 1.12.1') # https://github.com/Empact/roo
+  spec.add_dependency('roo', '~> 1.12.1') # https://github.com/Empact/roo
+  spec.add_dependency('spreadsheet', '~> 0.9.6') # https://github.com/Empact/roo
   spec.add_dependency('activemodel', '~> 3.2')
   spec.add_dependency('google_drive')
 end
diff --git a/lib/goodsheet/version.rb b/lib/goodsheet/version.rb
index dd2bda1..2378f15 100644
--- a/lib/goodsheet/version.rb
+++ b/lib/goodsheet/version.rb
@@ -1,3 +1,3 @@
 module Goodsheet
-  VERSION = "0.4.0"
+  VERSION = "0.4.1"
 end