diff --git a/ransack.gemspec b/ransack.gemspec
index be177a9..cd63cac 100644
--- a/ransack.gemspec
+++ b/ransack.gemspec
@@ -19,12 +19,12 @@ Gem::Specification.new do |s|
   s.add_dependency 'activerecord', '>= 3.0'
   s.add_dependency 'activesupport', '>= 3.0'
   s.add_dependency 'i18n'
-  s.add_dependency 'polyamorous', '~> 1.1.0'
+  s.add_dependency 'polyamorous', '~> 1.1'
   s.add_development_dependency 'rspec', '~> 2.14.0'
   s.add_development_dependency 'machinist', '~> 1.0.6'
   s.add_development_dependency 'faker', '~> 0.9.5'
   s.add_development_dependency 'sqlite3', '~> 1.3.3'
-  s.add_development_dependency 'pg', '0.17.0'
+  s.add_development_dependency 'pg'
   s.add_development_dependency 'mysql2', '0.3.14'
   s.add_development_dependency 'pry', '0.9.12.2'