diff --git a/email_address.gemspec b/email_address.gemspec
index 0a9ee0c..25789b7 100644
--- a/email_address.gemspec
+++ b/email_address.gemspec
@@ -31,5 +31,5 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "codeclimate-test-reporter"
 
   spec.add_dependency "simpleidn"
-  spec.add_dependency "netaddr"
+  spec.add_dependency "netaddr", "~> 1.5.1"
 end
diff --git a/lib/email_address/version.rb b/lib/email_address/version.rb
index 9e3c468..32b80ab 100644
--- a/lib/email_address/version.rb
+++ b/lib/email_address/version.rb
@@ -1,3 +1,3 @@
 module EmailAddress
-  VERSION = "0.1.7"
+  VERSION = "0.1.8"
 end