diff --git a/twingly-url.gemspec b/twingly-url.gemspec
index 1f0bc9a..3b54760 100644
--- a/twingly-url.gemspec
+++ b/twingly-url.gemspec
@@ -12,8 +12,8 @@ Gem::Specification.new do |s|
   s.license     = "MIT"
   s.required_ruby_version = "~> 2.2"
 
-  s.add_dependency "addressable", "= 2.5.2"
-  s.add_dependency "public_suffix", "= 3.0.1"
+  s.add_dependency "addressable", "~> 2.5.2"
+  s.add_dependency "public_suffix", "~> 3.0.1"
 
   s.add_development_dependency "rake", "~> 10"
   s.add_development_dependency "rspec", "~> 3"