diff --git a/jekyll-seo-tag.gemspec b/jekyll-seo-tag.gemspec
index 75abd13..5d06090 100644
--- a/jekyll-seo-tag.gemspec
+++ b/jekyll-seo-tag.gemspec
@@ -27,9 +27,9 @@ Gem::Specification.new do |spec|
   spec.require_paths = ["lib"]
 
   spec.add_dependency "jekyll", "~> 3.3"
-  spec.add_development_dependency "bundler", "~> 1.10"
-  spec.add_development_dependency "rake", "~> 10.0"
-  spec.add_development_dependency "rspec", "~> 3.3"
-  spec.add_development_dependency "html-proofer", "~> 2.5"
+  spec.add_development_dependency "bundler", "~> 1.14"
+  spec.add_development_dependency "rake", "~> 12.0"
+  spec.add_development_dependency "rspec", "~> 3.5"
+  spec.add_development_dependency "html-proofer", "~> 3.6"
   spec.add_development_dependency "rubocop", "~> 0.48"
 end