diff --git a/iso8601.gemspec b/iso8601.gemspec
index a5a3cc5..03dd32d 100644
--- a/iso8601.gemspec
+++ b/iso8601.gemspec
@@ -23,7 +23,7 @@ Gem::Specification.new do |s|
   s.metadata["yard.run"] = "yri"
   s.required_ruby_version = '>= 2.4.0'
   s.add_development_dependency 'pry', '~> 0.13.1'
-  s.add_development_dependency 'pry-doc', '~> 1.1.0'
+  s.add_development_dependency 'pry-doc', '~> 1.3.0'
   s.add_development_dependency 'rake', '~> 13.0'
   s.add_development_dependency 'rspec', '~> 3.9'
   s.add_development_dependency 'rubocop', '~> 0.89'