diff --git a/Gemfile b/Gemfile
index 55fd4eec..7a995502 100644
--- a/Gemfile
+++ b/Gemfile
@@ -9,4 +9,4 @@ gem 'wdm', '>= 0.1.1' if Gem.win_platform?
 
 gem "webrick", "~> 1.8"
 
-gem 'html-proofer', "~> 3.19.4"
+gem 'html-proofer', "~> 5.0.7"
diff --git a/Gemfile.lock b/Gemfile.lock
index 1d45ee01..93d5a166 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,13 +1,19 @@
 GEM
   remote: https://rubygems.org/
   specs:
+    Ascii85 (1.1.0)
     activesupport (7.0.4.2)
       concurrent-ruby (~> 1.0, >= 1.0.2)
       i18n (>= 1.6, < 2)
       minitest (>= 5.1)
       tzinfo (~> 2.0)
-    addressable (2.8.1)
+    addressable (2.8.4)
       public_suffix (>= 2.0.2, < 6.0)
+    afm (0.2.2)
+    async (2.5.0)
+      console (~> 1.10)
+      io-event (~> 1.1)
+      timers (~> 4.1)
     coffee-script (2.4.1)
       coffee-script-source
       execjs
@@ -15,6 +21,8 @@ GEM
     colorator (1.1.0)
     commonmarker (0.23.8)
     concurrent-ruby (1.2.0)
+    console (1.16.2)
+      fiber-local
     dnsruby (1.61.9)
       simpleidn (~> 0.1)
     em-websocket (0.5.3)
@@ -30,7 +38,7 @@ GEM
       ruby2_keywords (>= 0.0.4)
     faraday-net_http (3.0.2)
     ffi (1.15.5)
-    ffi (1.15.5-x64-mingw32)
+    fiber-local (1.0.0)
     forwardable-extended (2.6.0)
     gemoji (3.0.1)
     github-pages (228)
@@ -84,20 +92,23 @@ GEM
       octokit (~> 4.0)
       public_suffix (>= 3.0, < 5.0)
       typhoeus (~> 1.3)
+    hashery (2.1.2)
     html-pipeline (2.14.3)
       activesupport (>= 2)
       nokogiri (>= 1.4)
-    html-proofer (3.19.4)
+    html-proofer (5.0.7)
       addressable (~> 2.3)
-      mercenary (~> 0.3)
+      async (~> 2.1)
       nokogiri (~> 1.13)
-      parallel (~> 1.10)
+      pdf-reader (~> 2.11)
       rainbow (~> 3.0)
       typhoeus (~> 1.3)
       yell (~> 2.0)
+      zeitwerk (~> 2.5)
     http_parser.rb (0.8.0)
     i18n (1.12.0)
       concurrent-ruby (~> 1.0)
+    io-event (1.1.7)
     jekyll (3.9.3)
       addressable (~> 2.4)
       colorator (~> 1.0)
@@ -221,17 +232,20 @@ GEM
       jekyll-feed (~> 0.9)
       jekyll-seo-tag (~> 2.1)
     minitest (5.17.0)
-    nokogiri (1.14.1)
+    nokogiri (1.14.3)
       mini_portile2 (~> 2.8.0)
       racc (~> 1.4)
-    nokogiri (1.14.1-x64-mingw32)
-      racc (~> 1.4)
     octokit (4.25.1)
       faraday (>= 1, < 3)
       sawyer (~> 0.9)
-    parallel (1.22.1)
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
+    pdf-reader (2.11.0)
+      Ascii85 (~> 1.0)
+      afm (~> 0.2.1)
+      hashery (~> 2.0)
+      ruby-rc4
+      ttfunk
     public_suffix (4.0.7)
     racc (1.6.2)
     rainbow (3.1.1)
@@ -240,6 +254,7 @@ GEM
       ffi (~> 1.0)
     rexml (3.2.5)
     rouge (3.26.0)
+    ruby-rc4 (0.1.5)
     ruby2_keywords (0.0.5)
     rubyzip (2.3.2)
     safe_yaml (1.0.5)
@@ -255,6 +270,8 @@ GEM
       unf (~> 0.1.4)
     terminal-table (1.8.0)
       unicode-display_width (~> 1.1, >= 1.1.1)
+    timers (4.3.5)
+    ttfunk (1.7.0)
     typhoeus (1.4.0)
       ethon (>= 0.9.0)
     tzinfo (2.0.6)
@@ -266,6 +283,7 @@ GEM
     unicode-display_width (1.8.0)
     webrick (1.8.1)
     yell (2.2.2)
+    zeitwerk (2.6.7)
 
 PLATFORMS
   ruby
@@ -273,7 +291,7 @@ PLATFORMS
 
 DEPENDENCIES
   github-pages (= 228)
-  html-proofer (~> 3.19.4)
+  html-proofer (~> 5.0.7)
   webrick (~> 1.8)
 
 BUNDLED WITH