diff --git a/.ruby-version b/.ruby-version
index 73462a5a..338a5b5d 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-2.5.1
+2.6.6
diff --git a/gman.gemspec b/gman.gemspec
index 8075c259..2e17e448 100644
--- a/gman.gemspec
+++ b/gman.gemspec
@@ -29,7 +29,7 @@ Gem::Specification.new do |s|
   s.add_dependency('colored', '~> 1.2')
   s.add_dependency('iso_country_codes', '~> 0.6')
   s.add_dependency('naughty_or_nice', '= 2.1.1')
-  s.add_dependency('public_suffix', '~> 3.0')
+  s.add_dependency('public_suffix', '>= 3.0')
 
   s.add_development_dependency('addressable', '~> 2.3')
   s.add_development_dependency('mechanize', '~> 2.7')