diff --git a/Gemfile b/Gemfile
index df0784173b5..0d92f2c2c1c 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,7 +1,7 @@
 source "https://rubygems.org"
 
 gem "jekyll", "3.9.3"
-gem "html-proofer", "3.19.4"
+gem "html-proofer", "5.0.10"
 gem "jekyll-remote-theme"
 gem "deep_merge"
 gem 'jekyll-open-sdg-plugins', "2.3.0"
diff --git a/Gemfile.lock b/Gemfile.lock
index d7afbe23f6d..05dd3cf9326 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,10 +1,23 @@
 GEM
   remote: https://rubygems.org/
   specs:
+    Ascii85 (2.0.1)
     addressable (2.8.7)
       public_suffix (>= 2.0.2, < 7.0)
+    afm (0.2.2)
+    async (2.23.1)
+      console (~> 1.29)
+      fiber-annotation
+      io-event (~> 1.9)
+      metrics (~> 0.12)
+      traces (~> 0.15)
+    bigdecimal (3.1.9)
     colorator (1.1.0)
     concurrent-ruby (1.3.4)
+    console (1.30.2)
+      fiber-annotation
+      fiber-local (~> 1.1)
+      json
     deep_merge (1.2.2)
     ecma-re-validator (0.4.0)
       regexp_parser (~> 2.2)
@@ -14,22 +27,29 @@ GEM
     ethon (0.16.0)
       ffi (>= 1.15.0)
     eventmachine (1.2.7)
-    ffi (1.17.0-arm64-darwin)
-    ffi (1.17.0-x86_64-darwin)
-    ffi (1.17.0-x86_64-linux-gnu)
+    ffi (1.17.1-arm64-darwin)
+    ffi (1.17.1-x86_64-darwin)
+    ffi (1.17.1-x86_64-linux-gnu)
+    fiber-annotation (0.2.0)
+    fiber-local (1.1.0)
+      fiber-storage
+    fiber-storage (1.0.0)
     forwardable-extended (2.6.0)
     hana (1.3.7)
-    html-proofer (3.19.4)
+    hashery (2.1.2)
+    html-proofer (5.0.10)
       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 (1.14.6)
       concurrent-ruby (~> 1.0)
+    io-event (1.10.0)
     jekyll (3.9.3)
       addressable (~> 2.4)
       colorator (~> 1.0)
@@ -56,6 +76,7 @@ GEM
       sass (~> 3.4)
     jekyll-watch (2.2.1)
       listen (~> 3.0)
+    json (2.10.2)
     json_schemer (0.2.25)
       ecma-re-validator (~> 0.3)
       hana (~> 1.3)
@@ -71,15 +92,21 @@ GEM
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
     mercenary (0.3.6)
-    nokogiri (1.16.7-arm64-darwin)
+    metrics (0.12.2)
+    nokogiri (1.18.4-arm64-darwin)
       racc (~> 1.4)
-    nokogiri (1.16.7-x86_64-darwin)
+    nokogiri (1.18.4-x86_64-darwin)
       racc (~> 1.4)
-    nokogiri (1.16.7-x86_64-linux)
+    nokogiri (1.18.4-x86_64-linux-gnu)
       racc (~> 1.4)
-    parallel (1.26.3)
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
+    pdf-reader (2.14.1)
+      Ascii85 (>= 1.0, < 3.0, != 2.0.0)
+      afm (~> 0.2.1)
+      hashery (~> 2.0)
+      ruby-rc4
+      ttfunk
     public_suffix (6.0.1)
     racc (1.8.1)
     rainbow (3.1.1)
@@ -89,6 +116,7 @@ GEM
     regexp_parser (2.9.2)
     rexml (3.3.9)
     rouge (3.30.0)
+    ruby-rc4 (0.1.5)
     rubyzip (2.3.2)
     safe_yaml (1.0.5)
     sass (3.7.4)
@@ -97,11 +125,15 @@ GEM
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
     simpleidn (0.2.3)
+    traces (0.15.2)
+    ttfunk (1.8.0)
+      bigdecimal (~> 3.1)
     typhoeus (1.4.1)
       ethon (>= 0.9.0)
     uri_template (0.7.0)
     webrick (1.8.2)
     yell (2.2.2)
+    zeitwerk (2.7.2)
 
 PLATFORMS
   arm64-darwin-23
@@ -111,7 +143,7 @@ PLATFORMS
 
 DEPENDENCIES
   deep_merge
-  html-proofer (= 3.19.4)
+  html-proofer (= 5.0.10)
   jekyll (= 3.9.3)
   jekyll-open-sdg-plugins (= 2.3.0)
   jekyll-remote-theme