ladder_drive.gemspec in ladder_drive-0.5.2 vs ladder_drive.gemspec in ladder_drive-0.6.0

@@ -14,10 +14,11 @@
   spec.homepage      = "https://github.com/ito-soft-design/ladder_drive"
   spec.license       = "MIT"
 
   spec.add_runtime_dependency 'thor', '~> 0'
   spec.add_runtime_dependency 'activesupport', '~> 4.2', '>= 4.2.7'
-  spec.add_runtime_dependency 'pi_piper'
+  spec.add_runtime_dependency 'ffi', '~> 1.9.24', '>= 1.9.24'
+  spec.add_runtime_dependency 'pi_piper', '~> 2.0', '>= 2.0.0'
 
   spec.files         = `git ls-files -z`.split("\x0").reject { |f| f.match(%r{^(test|spec|features)/}) }
   spec.bindir        = "exe"
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ["lib"]