diff --git a/Gemfile b/Gemfile
index af47e28..09e387d 100644
--- a/Gemfile
+++ b/Gemfile
@@ -3,7 +3,7 @@ source "https://rubygems.org/"
 gemspec
 
 group :benchmark do
-  gem "benchmark-ips", "~> 2.3.0"
+  gem "benchmark-ips", "~> 2.7.2"
   gem "bluecloth", "~> 2.2.0"
-  gem "kramdown", "~> 1.8.0"
+  gem "kramdown", "~> 1.13.2"
 end
diff --git a/redcarpet.gemspec b/redcarpet.gemspec
index 01cb998..22891d3 100644
--- a/redcarpet.gemspec
+++ b/redcarpet.gemspec
@@ -65,7 +65,7 @@ Gem::Specification.new do |s|
   s.executables = ["redcarpet"]
   s.require_paths = ["lib"]
 
-  s.add_development_dependency "rake", "~> 10.5"
-  s.add_development_dependency "rake-compiler", "~> 0.9.5"
-  s.add_development_dependency "test-unit", "~> 3.1.3"
+  s.add_development_dependency "rake", "~> 12.0"
+  s.add_development_dependency "rake-compiler", "~> 1.0.3"
+  s.add_development_dependency "test-unit", "~> 3.2.3"
 end