diff --git a/Gemfile b/Gemfile
index 4748d74b..edba56f6 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,7 +1,7 @@
 source "https://rubygems.org"
 ruby RUBY_VERSION
 
-gem "jekyll", "3.4.3"
+gem "jekyll", "3.6.3"
 
 # to use GitHub Pages
 # gem "github-pages", group: :jekyll_plugins
diff --git a/Gemfile.lock b/Gemfile.lock
index 96cb989a..fa9ee398 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,8 +1,8 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    addressable (2.5.1)
-      public_suffix (~> 2.0, >= 2.0.2)
+    addressable (2.7.0)
+      public_suffix (>= 2.0.2, < 5.0)
     algolia_html_extractor (2.6.1)
       json (~> 2.0)
       nokogiri (~> 1.8.2)
@@ -10,20 +10,20 @@ GEM
       httpclient (~> 2.8, >= 2.8.3)
       json (>= 1.5.1)
     colorator (1.1.0)
-    ffi (1.9.18)
+    ffi (1.12.1)
     filesize (0.2.0)
     forwardable-extended (2.6.0)
     httpclient (2.8.3)
-    jekyll (3.4.3)
+    jekyll (3.6.3)
       addressable (~> 2.4)
       colorator (~> 1.0)
       jekyll-sass-converter (~> 1.0)
       jekyll-watch (~> 1.1)
-      kramdown (~> 1.3)
-      liquid (~> 3.0)
+      kramdown (~> 1.14)
+      liquid (~> 4.0)
       mercenary (~> 0.3.3)
       pathutil (~> 0.9)
-      rouge (~> 1.7)
+      rouge (>= 1.7, < 3)
       safe_yaml (~> 1.0)
     jekyll-algolia (1.4.7)
       algolia_html_extractor (~> 2.6)
@@ -38,41 +38,45 @@ GEM
       jekyll (~> 3.3)
     jekyll-redirect-from (0.12.1)
       jekyll (~> 3.3)
-    jekyll-sass-converter (1.5.0)
+    jekyll-sass-converter (1.5.2)
       sass (~> 3.4)
     jekyll-seo-tag (2.2.2)
       jekyll (~> 3.3)
     jekyll-sitemap (1.1.1)
       jekyll (~> 3.3)
-    jekyll-watch (1.5.0)
-      listen (~> 3.0, < 3.1)
+    jekyll-watch (1.5.1)
+      listen (~> 3.0)
     json (2.1.0)
-    kramdown (1.13.2)
-    liquid (3.0.6)
-    listen (3.0.8)
-      rb-fsevent (~> 0.9, >= 0.9.4)
-      rb-inotify (~> 0.9, >= 0.9.7)
+    kramdown (1.17.0)
+    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)
     mini_portile2 (2.3.0)
     nokogiri (1.8.5)
       mini_portile2 (~> 2.3.0)
-    pathutil (0.14.0)
+    pathutil (0.16.2)
       forwardable-extended (~> 2.6)
     progressbar (1.10.0)
-    public_suffix (2.0.5)
-    rb-fsevent (0.9.8)
-    rb-inotify (0.9.8)
-      ffi (>= 0.5.0)
-    rouge (1.11.1)
-    safe_yaml (1.0.4)
-    sass (3.4.23)
+    public_suffix (4.0.3)
+    rb-fsevent (0.10.3)
+    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)
     verbal_expressions (0.1.5)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
-  jekyll (= 3.4.3)
+  jekyll (= 3.6.3)
   jekyll-algolia (~> 1.0)
   jekyll-feed
   jekyll-redirect-from