diff --git a/daru-io.gemspec b/daru-io.gemspec
index 84388e5..b8eca59 100644
--- a/daru-io.gemspec
+++ b/daru-io.gemspec
@@ -20,7 +20,7 @@ Gem::Specification.new do |spec|
   spec.executables   = spec.files.grep(%r{^bin/}) { |f| File.basename(f) }
   spec.require_paths = ['lib']
 
-  spec.add_development_dependency 'daru', '~> 0.2.0'
+  spec.add_development_dependency 'daru', '>= 0.2.0'
 
   spec.add_development_dependency 'bundler', '~> 1.15'
   spec.add_development_dependency 'rake', '~> 10.0'
diff --git a/lib/daru/io/version.rb b/lib/daru/io/version.rb
index a59eb67..ca31dec 100644
--- a/lib/daru/io/version.rb
+++ b/lib/daru/io/version.rb
@@ -1,5 +1,5 @@
 module Daru
   module IO
-    VERSION = '0.1.0'.freeze
+    VERSION = '0.1.1'.freeze
   end
 end