diff --git a/Gemfile b/Gemfile
index bf248e13..cbf126c6 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,11 +1,11 @@
 source "https://rubygems.org"
 
-gem 'jekyll', '3.9.2'
+gem 'jekyll', '4.3.1'
 # gem 'github-pages', '227' , group: :jekyll_plugins
 gem 'jekyll-sitemap', '1.4.0'
 gem 'jekyll-redirect-from', '0.16.0'
 gem 'jekyll-last-modified-at'
-gem 'jekyll-sass-converter',	'1.5.2'
+gem 'jekyll-sass-converter',	'2.2.0'
 gem 'redcarpet'
 gem 'rake'
 gem 'gemoji'
diff --git a/Gemfile.lock b/Gemfile.lock
index 5d33fd6e..1c9603f1 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -39,28 +39,31 @@ GEM
     http-cookie (1.0.5)
       domain_name (~> 0.5)
     http_parser.rb (0.8.0)
-    i18n (0.9.5)
+    i18n (1.12.0)
       concurrent-ruby (~> 1.0)
-    jekyll (3.9.2)
+    jekyll (4.3.1)
       addressable (~> 2.4)
       colorator (~> 1.0)
       em-websocket (~> 0.5)
-      i18n (~> 0.7)
-      jekyll-sass-converter (~> 1.0)
+      i18n (~> 1.0)
+      jekyll-sass-converter (>= 2.0, < 4.0)
       jekyll-watch (~> 2.0)
-      kramdown (>= 1.17, < 3)
+      kramdown (~> 2.3, >= 2.3.1)
+      kramdown-parser-gfm (~> 1.0)
       liquid (~> 4.0)
-      mercenary (~> 0.3.3)
+      mercenary (>= 0.3.6, < 0.5)
       pathutil (~> 0.9)
-      rouge (>= 1.7, < 4)
+      rouge (>= 3.0, < 5.0)
       safe_yaml (~> 1.0)
+      terminal-table (>= 1.8, < 4.0)
+      webrick (~> 1.7)
     jekyll-last-modified-at (1.3.0)
       jekyll (>= 3.7, < 5.0)
       posix-spawn (~> 0.3.9)
     jekyll-redirect-from (0.16.0)
       jekyll (>= 3.3, < 5.0)
-    jekyll-sass-converter (1.5.2)
-      sass (~> 3.4)
+    jekyll-sass-converter (2.2.0)
+      sassc (> 2.0.1, < 3.0)
     jekyll-sitemap (1.4.0)
       jekyll (>= 3.7, < 5.0)
     jekyll-watch (2.2.1)
@@ -75,7 +78,7 @@ GEM
     listen (3.7.1)
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
-    mercenary (0.3.6)
+    mercenary (0.4.0)
     metainspector (5.13.1)
       addressable (~> 2.8)
       faraday (~> 2.5)
@@ -98,7 +101,7 @@ GEM
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
     posix-spawn (0.3.15)
-    public_suffix (5.0.0)
+    public_suffix (5.0.1)
     racc (1.6.0)
     rake (13.0.6)
     rb-fsevent (0.11.2)
@@ -108,20 +111,21 @@ GEM
     redcarpet (3.5.1)
     ref (2.0.0)
     rexml (3.2.5)
-    rouge (3.30.0)
+    rouge (4.0.0)
     ruby2_keywords (0.0.5)
     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)
+    sassc (2.4.0)
+      ffi (~> 1.9)
+    terminal-table (3.0.2)
+      unicode-display_width (>= 1.1.1, < 3)
     therubyracer (0.12.3)
       libv8 (~> 3.16.14.15)
       ref
     unf (0.1.4)
       unf_ext
     unf_ext (0.0.8.2)
+    unicode-display_width (2.3.0)
+    webrick (1.7.0)
     zlib (2.1.1)
 
 PLATFORMS
@@ -131,10 +135,10 @@ PLATFORMS
 DEPENDENCIES
   gemoji
   git
-  jekyll (= 3.9.2)
+  jekyll (= 4.3.1)
   jekyll-last-modified-at
   jekyll-redirect-from (= 0.16.0)
-  jekyll-sass-converter (= 1.5.2)
+  jekyll-sass-converter (= 2.2.0)
   jekyll-sitemap (= 1.4.0)
   kramdown-parser-gfm (= 1.1.0)
   metainspector