diff --git a/Dockerfiles/Dockerfile.static_site b/Dockerfiles/Dockerfile.static_site
index 6271099f..d63e8c2d 100644
--- a/Dockerfiles/Dockerfile.static_site
+++ b/Dockerfiles/Dockerfile.static_site
@@ -1,4 +1,4 @@
-FROM jekyll/builder:4.2.0
+FROM jekyll/builder:4.2.2
 
 ENV BUNDLE_PATH=$GEM_HOME
 WORKDIR /dpc-site-static
diff --git a/Gemfile b/Gemfile
index c6383d6c..14ae16fb 100644
--- a/Gemfile
+++ b/Gemfile
@@ -32,4 +32,5 @@ gem "wdm", "~> 0.1.1", :install_if => Gem.win_platform?
 gem "json"
 
 # rexml 3.2.5 resolves a vulnerability
-gem "rexml", ">= 3.2.5"
\ No newline at end of file
+gem "rexml", ">= 3.2.5"
+gem "html-proofer", "~> 5.0"
diff --git a/Gemfile.lock b/Gemfile.lock
index b76222e8..a529b1b7 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,19 +1,44 @@
 GEM
   remote: https://rubygems.org/
   specs:
+    Ascii85 (1.1.0)
     addressable (2.8.0)
       public_suffix (>= 2.0.2, < 5.0)
+    afm (0.2.2)
+    async (2.6.3)
+      console (~> 1.10)
+      fiber-annotation
+      io-event (~> 1.1)
+      timers (~> 4.1)
     colorator (1.1.0)
     concurrent-ruby (1.1.9)
+    console (1.23.2)
+      fiber-annotation
+      fiber-local
     em-websocket (0.5.2)
       eventmachine (>= 0.12.9)
       http_parser.rb (~> 0.6.0)
+    ethon (0.16.0)
+      ffi (>= 1.15.0)
     eventmachine (1.2.7)
     ffi (1.15.3)
+    fiber-annotation (0.2.0)
+    fiber-local (1.0.0)
     forwardable-extended (2.6.0)
+    hashery (2.1.2)
+    html-proofer (5.0.8)
+      addressable (~> 2.3)
+      async (~> 2.1)
+      nokogiri (~> 1.13)
+      pdf-reader (~> 2.11)
+      rainbow (~> 3.0)
+      typhoeus (~> 1.3)
+      yell (~> 2.0)
+      zeitwerk (~> 2.5)
     http_parser.rb (0.6.0)
     i18n (1.8.10)
       concurrent-ruby (~> 1.0)
+    io-event (1.3.2)
     jekyll (4.0.1)
       addressable (~> 2.4)
       colorator (~> 1.0)
@@ -47,36 +72,58 @@ GEM
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
     mercenary (0.3.6)
+    mini_portile2 (2.8.4)
     minima (2.5.1)
       jekyll (>= 3.5, < 5.0)
       jekyll-feed (~> 0.9)
       jekyll-seo-tag (~> 2.1)
+    nokogiri (1.15.4)
+      mini_portile2 (~> 2.8.2)
+      racc (~> 1.4)
+    nokogiri (1.15.4-x86_64-linux)
+      racc (~> 1.4)
     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 (4.0.6)
+    racc (1.7.1)
+    rainbow (3.1.1)
     rb-fsevent (0.11.0)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
     rexml (3.2.5)
     rouge (3.26.0)
+    ruby-rc4 (0.1.5)
     safe_yaml (1.0.5)
     sassc (2.4.0)
       ffi (~> 1.9)
     terminal-table (1.8.0)
       unicode-display_width (~> 1.1, >= 1.1.1)
     thread_safe (0.3.6)
+    timers (4.3.5)
+    ttfunk (1.7.0)
+    typhoeus (1.4.0)
+      ethon (>= 0.9.0)
     tzinfo (1.2.10)
       thread_safe (~> 0.1)
     tzinfo-data (1.2022.1)
       tzinfo (>= 1.0.0)
     unicode-display_width (1.7.0)
     wdm (0.1.1)
+    yell (2.2.2)
+    zeitwerk (2.6.11)
 
 PLATFORMS
   ruby
   x86_64-linux-musl
 
 DEPENDENCIES
+  html-proofer (~> 5.0)
   jekyll (~> 4.0.0)
   jekyll-feed (~> 0.12)
   json