diff --git a/addressable.gemspec b/addressable.gemspec
index 2055121d..c395eb41 100644
--- a/addressable.gemspec
+++ b/addressable.gemspec
@@ -23,6 +23,6 @@ Gem::Specification.new do |s|
 
   s.specification_version = 4
 
-  s.add_runtime_dependency(%q<public_suffix>.freeze, [">= 2.0.2".freeze, "< 6.0".freeze])
+  s.add_runtime_dependency(%q<public_suffix>.freeze, [">= 2.0.2".freeze, "< 7.0".freeze])
   s.add_development_dependency(%q<bundler>.freeze, [">= 1.0".freeze, "< 3.0".freeze])
 end
diff --git a/tasks/gem.rake b/tasks/gem.rake
index e95115ad..664eb3ef 100644
--- a/tasks/gem.rake
+++ b/tasks/gem.rake
@@ -21,7 +21,7 @@ namespace :gem do
 
     s.required_ruby_version = ">= 2.2"
 
-    s.add_runtime_dependency "public_suffix", ">= 2.0.2", "< 6.0"
+    s.add_runtime_dependency "public_suffix", ">= 2.0.2", "< 7.0"
     s.add_development_dependency "bundler", ">= 1.0", "< 3.0"
 
     s.require_path = "lib"