diff --git a/gepub.gemspec b/gepub.gemspec
index abdf8d0..da6fdc7 100644
--- a/gepub.gemspec
+++ b/gepub.gemspec
@@ -17,7 +17,7 @@ Gem::Specification.new do |s|
   s.require_paths = ["lib"]
 
   s.add_runtime_dependency "nokogiri", ">= 1.8.2", "< 2.0"
-  s.add_runtime_dependency "rubyzip", "> 1.1.1", "< 2.4"
+  s.add_runtime_dependency "rubyzip", "> 1.1.1", "< 2.5"
   s.add_development_dependency "epubcheck-ruby"
   s.add_development_dependency "rake"
   s.add_development_dependency "rspec"