diff --git a/Gemfile b/Gemfile
index 6409009..fc5dde3 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,16 +2,16 @@ source "https://rubygems.org"
 
 group :development do
   gem 'rake', '~> 12.3'
-  gem 'jekyll', '~> 2.0'
+  gem 'jekyll', '~> 4.3'
   gem 'octopress-hooks', '~> 2.2'
-  gem 'octopress-date-format', '~> 2.0'
+  gem 'octopress-date-format', '~> 3.0'
   gem 'jekyll-sitemap'
   gem 'rdiscount', '~> 2.0'
   gem 'RedCloth', '~> 4.3.0'
   gem 'haml', '~> 5.0'
   gem 'compass', '~> 1.0.1'
   gem 'sass-globbing', '~> 1.0.0'
-  gem 'rb-fsevent', '~> 0.9'
+  gem 'rb-fsevent', '~> 0.11'
   gem 'stringex', '~> 1.4.0'
 end
 
diff --git a/Gemfile.lock b/Gemfile.lock
index 2843ac1..194f791 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -2,17 +2,10 @@ GEM
   remote: https://rubygems.org/
   specs:
     RedCloth (4.3.0)
-    blankslate (2.1.2.4)
-    celluloid (0.16.0)
-      timers (~> 4.0.0)
+    addressable (2.8.4)
+      public_suffix (>= 2.0.2, < 6.0)
     chunky_png (1.3.4)
-    classifier-reborn (2.0.3)
-      fast-stemmer (~> 1.0)
-    coffee-script (2.4.1)
-      coffee-script-source
-      execjs
-    coffee-script-source (1.9.1.1)
-    colorator (0.1)
+    colorator (1.1.0)
     compass (1.0.3)
       chunky_png (~> 1.2)
       compass-core (~> 1.0.2)
@@ -25,70 +18,76 @@ GEM
       sass (>= 3.3.0, < 3.5)
     compass-import-once (1.0.5)
       sass (>= 3.2, < 3.5)
-    execjs (2.5.2)
-    fast-stemmer (1.0.2)
-    ffi (1.13.1)
+    concurrent-ruby (1.2.2)
+    em-websocket (0.5.3)
+      eventmachine (>= 0.12.9)
+      http_parser.rb (~> 0)
+    eventmachine (1.2.7)
+    ffi (1.15.5)
+    forwardable-extended (2.6.0)
+    google-protobuf (3.22.3)
     haml (5.0.0)
       temple (>= 0.8.0)
       tilt
-    hitimes (1.2.2)
-    jekyll (2.5.3)
-      classifier-reborn (~> 2.0)
-      colorator (~> 0.1)
-      jekyll-coffeescript (~> 1.0)
-      jekyll-gist (~> 1.0)
-      jekyll-paginate (~> 1.0)
-      jekyll-sass-converter (~> 1.0)
-      jekyll-watch (~> 1.1)
-      kramdown (~> 1.3)
-      liquid (~> 2.6.1)
-      mercenary (~> 0.3.3)
-      pygments.rb (~> 0.6.0)
-      redcarpet (~> 3.1)
+    http_parser.rb (0.8.0)
+    i18n (1.12.0)
+      concurrent-ruby (~> 1.0)
+    jekyll (4.3.2)
+      addressable (~> 2.4)
+      colorator (~> 1.0)
+      em-websocket (~> 0.5)
+      i18n (~> 1.0)
+      jekyll-sass-converter (>= 2.0, < 4.0)
+      jekyll-watch (~> 2.0)
+      kramdown (~> 2.3, >= 2.3.1)
+      kramdown-parser-gfm (~> 1.0)
+      liquid (~> 4.0)
+      mercenary (>= 0.3.6, < 0.5)
+      pathutil (~> 0.9)
+      rouge (>= 3.0, < 5.0)
       safe_yaml (~> 1.0)
-      toml (~> 0.1.0)
-    jekyll-coffeescript (1.0.1)
-      coffee-script (~> 2.2)
-    jekyll-gist (1.2.1)
-    jekyll-paginate (1.1.0)
-    jekyll-sass-converter (1.3.0)
-      sass (~> 3.2)
+      terminal-table (>= 1.8, < 4.0)
+      webrick (~> 1.7)
+    jekyll-sass-converter (3.0.0)
+      sass-embedded (~> 1.54)
     jekyll-sitemap (0.8.1)
-    jekyll-watch (1.2.1)
-      listen (~> 2.7)
-    kramdown (1.7.0)
-    liquid (2.6.2)
-    listen (2.10.0)
-      celluloid (~> 0.16.0)
-      rb-fsevent (>= 0.9.3)
-      rb-inotify (>= 0.9)
-    mercenary (0.3.5)
+    jekyll-watch (2.2.1)
+      listen (~> 3.0)
+    kramdown (2.4.0)
+      rexml
+    kramdown-parser-gfm (1.1.0)
+      kramdown (~> 2.0)
+    liquid (4.0.4)
+    listen (3.8.0)
+      rb-fsevent (~> 0.10, >= 0.10.3)
+      rb-inotify (~> 0.9, >= 0.9.10)
+    mercenary (0.4.0)
     multi_json (1.11.0)
     mustermann (1.1.1)
       ruby2_keywords (~> 0.0.1)
-    octopress-date-format (2.0.2)
-      jekyll (~> 2.0)
-      octopress-hooks (~> 2.0)
+    octopress-date-format (3.0.3)
+      jekyll (>= 2.0)
     octopress-hooks (2.6.1)
       jekyll (>= 2.0)
-    parslet (1.5.0)
-      blankslate (~> 2.0)
-    posix-spawn (0.3.11)
-    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 (5.0.1)
     rack (2.2.3)
     rack-protection (2.2.0)
       rack
     rake (12.3.3)
-    rb-fsevent (0.9.5)
-    rb-inotify (0.9.5)
-      ffi (>= 0.5.0)
+    rb-fsevent (0.11.2)
+    rb-inotify (0.10.1)
+      ffi (~> 1.0)
     rdiscount (2.1.8)
-    redcarpet (3.5.1)
+    rexml (3.2.5)
+    rouge (4.1.0)
     ruby2_keywords (0.0.5)
-    safe_yaml (1.0.4)
-    sass (3.4.14)
+    safe_yaml (1.0.5)
+    sass (3.4.25)
+    sass-embedded (1.62.0)
+      google-protobuf (~> 3.21)
+      rake (>= 10.0.0)
     sass-globbing (1.0.0)
       sass (>= 3.1)
     sinatra (2.2.0)
@@ -98,12 +97,11 @@ GEM
       tilt (~> 2.0)
     stringex (1.4.0)
     temple (0.8.2)
+    terminal-table (3.0.2)
+      unicode-display_width (>= 1.1.1, < 3)
     tilt (2.0.10)
-    timers (4.0.1)
-      hitimes
-    toml (0.1.2)
-      parslet (~> 1.5.0)
-    yajl-ruby (1.2.1)
+    unicode-display_width (2.4.2)
+    webrick (1.8.1)
 
 PLATFORMS
   ruby
@@ -112,12 +110,12 @@ DEPENDENCIES
   RedCloth (~> 4.3.0)
   compass (~> 1.0.1)
   haml (~> 5.0)
-  jekyll (~> 2.0)
+  jekyll (~> 4.3)
   jekyll-sitemap
-  octopress-date-format (~> 2.0)
+  octopress-date-format (~> 3.0)
   octopress-hooks (~> 2.2)
   rake (~> 12.3)
-  rb-fsevent (~> 0.9)
+  rb-fsevent (~> 0.11)
   rdiscount (~> 2.0)
   sass-globbing (~> 1.0.0)
   sinatra (~> 2.2.0)