diff --git a/Gemfile b/Gemfile
index 83931b2..a4f0716 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,7 +1,7 @@
 source "https://rubygems.org"
 
 # use an older version of Jekyll
-gem "jekyll", "~> 2.5.3"
+gem "jekyll", "~> 3.6.3"
 gem "i18n"
 
 group :jekyll_plugins do
diff --git a/Gemfile.lock b/Gemfile.lock
index f036c58..0e3f9c5 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,44 +1,25 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    addressable (2.5.2)
-      public_suffix (>= 2.0.2, < 4.0)
-    blankslate (2.1.2.4)
-    classifier-reborn (2.2.0)
-      fast-stemmer (~> 1.0)
-    coffee-script (2.4.1)
-      coffee-script-source
-      execjs
-    coffee-script-source (1.11.1)
-    colorator (0.1)
+    addressable (2.7.0)
+      public_suffix (>= 2.0.2, < 5.0)
+    colorator (1.1.0)
     concurrent-ruby (1.0.5)
-    execjs (2.7.0)
-    faraday (0.15.2)
-      multipart-post (>= 1.2, < 3)
-    fast-stemmer (1.0.2)
-    ffi (1.9.25)
+    ffi (1.12.2)
+    forwardable-extended (2.6.0)
     i18n (1.0.1)
       concurrent-ruby (~> 1.0)
-    jekyll (2.5.3)
-      classifier-reborn (~> 2.0)
-      colorator (~> 0.1)
-      jekyll-coffeescript (~> 1.0)
-      jekyll-gist (~> 1.0)
-      jekyll-paginate (~> 1.0)
+    jekyll (3.6.3)
+      addressable (~> 2.4)
+      colorator (~> 1.0)
       jekyll-sass-converter (~> 1.0)
       jekyll-watch (~> 1.1)
-      kramdown (~> 1.3)
-      liquid (~> 2.6.1)
+      kramdown (~> 1.14)
+      liquid (~> 4.0)
       mercenary (~> 0.3.3)
-      pygments.rb (~> 0.6.0)
-      redcarpet (~> 3.1)
+      pathutil (~> 0.9)
+      rouge (>= 1.7, < 3)
       safe_yaml (~> 1.0)
-      toml (~> 0.1.0)
-    jekyll-coffeescript (1.1.1)
-      coffee-script (~> 2.2)
-      coffee-script-source (~> 1.11.1)
-    jekyll-gist (1.5.0)
-      octokit (~> 4.2)
     jekyll-multiple-languages-plugin (1.2.7)
     jekyll-paginate (1.1.0)
     jekyll-sass-converter (1.5.2)
@@ -46,46 +27,31 @@ GEM
     jekyll-watch (1.5.1)
       listen (~> 3.0)
     kramdown (1.17.0)
-    liquid (2.6.3)
-    listen (3.1.5)
-      rb-fsevent (~> 0.9, >= 0.9.4)
-      rb-inotify (~> 0.9, >= 0.9.7)
-      ruby_dep (~> 1.2)
+    liquid (4.0.3)
+    listen (3.2.1)
+      rb-fsevent (~> 0.10, >= 0.10.3)
+      rb-inotify (~> 0.9, >= 0.9.10)
     mercenary (0.3.6)
-    multipart-post (2.0.0)
-    octokit (4.9.0)
-      sawyer (~> 0.8.0, >= 0.5.3)
-    parslet (1.5.0)
-      blankslate (~> 2.0)
-    posix-spawn (0.3.13)
-    public_suffix (3.0.2)
-    pygments.rb (0.6.3)
-      posix-spawn (~> 0.3.6)
-      yajl-ruby (~> 1.2.0)
+    pathutil (0.16.2)
+      forwardable-extended (~> 2.6)
+    public_suffix (4.0.3)
     rb-fsevent (0.10.3)
-    rb-inotify (0.9.10)
-      ffi (>= 0.5.0, < 2)
-    redcarpet (3.4.0)
-    ruby_dep (1.5.0)
-    safe_yaml (1.0.4)
-    sass (3.5.6)
+    rb-inotify (0.10.1)
+      ffi (~> 1.0)
+    rouge (2.2.1)
+    safe_yaml (1.0.5)
+    sass (3.7.4)
       sass-listen (~> 4.0.0)
     sass-listen (4.0.0)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
-    sawyer (0.8.1)
-      addressable (>= 2.3.5, < 2.6)
-      faraday (~> 0.8, < 1.0)
-    toml (0.1.2)
-      parslet (~> 1.5.0)
-    yajl-ruby (1.2.3)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
   i18n
-  jekyll (~> 2.5.3)
+  jekyll (~> 3.6.3)
   jekyll-multiple-languages-plugin (= 1.2.7)
   jekyll-paginate