diff --git a/html5up-readonly.gemspec b/html5up-readonly.gemspec
index f68a48b..a88d5ef 100644
--- a/html5up-readonly.gemspec
+++ b/html5up-readonly.gemspec
@@ -16,6 +16,6 @@ Gem::Specification.new do |spec|
   spec.add_runtime_dependency "jekyll-feed", "~> 0.9"
   spec.add_runtime_dependency "jekyll-seo-tag", "~> 2.1"
 
-  spec.add_development_dependency "bundler", "~> 1.16"
+  spec.add_development_dependency "bundler", "~> 2.0"
   spec.add_development_dependency "rake", "~> 12.0"
 end