diff --git a/Gemfile b/Gemfile
index 393825d..5672305 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,9 +1,7 @@
 source 'https://rubygems.org'
+gem 'jekyll'
 gem 'jekyll-paginate'
 gem 'kramdown'
-gem 'redcarpet'
 gem 'rouge'
-gem 'pygments.rb'
 gem 'text-hyphen'
-gem 'nokogiri'
-gem 'rdiscount'
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+gem 'nokogiri'
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diff --git a/_config.yml b/_config.yml
index 8f80816..28edc04 100644
--- a/_config.yml
+++ b/_config.yml
@@ -36,15 +36,13 @@ defaults:
 
 # other
 gems: [jekyll-paginate]
-markdown: rdiscount
+markdown: kramdown
 excerpt_separator: <a name="more"></a>
 photo_sizes:
   - [1920, 1080]
   - [640, 0]
   - [200, 200]
   - [96, 96]
-rdiscount:
-    extensions: [smart]
 exclude:
 - LICENSE
 - README
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