diff --git a/Gemfile b/Gemfile
index 34e6d83ea9..e5f77cc69a 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,4 +2,4 @@
 
 source "https://rubygems.org"
 
-gem "html-proofer", '<4.4'
\ No newline at end of file
+gem "html-proofer", '<5.1'
\ No newline at end of file
diff --git a/Gemfile.lock b/Gemfile.lock
index c1a7312f67..26dbdf4fdd 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,41 +1,70 @@
 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 (2.23.0)
+      console (~> 1.29)
+      fiber-annotation
+      io-event (~> 1.9)
+      metrics (~> 0.12)
+      traces (~> 0.15)
+    bigdecimal (3.1.9)
+    console (1.29.3)
+      fiber-annotation
+      fiber-local (~> 1.1)
+      json
     ethon (0.16.0)
       ffi (>= 1.15.0)
     ffi (1.17.1-aarch64-linux-gnu)
     ffi (1.17.1-x86_64-linux-gnu)
-    html-proofer (4.3.2)
+    fiber-annotation (0.2.0)
+    fiber-local (1.1.0)
+      fiber-storage
+    fiber-storage (1.0.0)
+    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)
-    mercenary (0.4.0)
-    nokogiri (1.18.1-aarch64-linux-gnu)
+    io-event (1.9.0)
+    json (2.10.1)
+    metrics (0.12.1)
+    nokogiri (1.18.3-aarch64-linux-gnu)
       racc (~> 1.4)
-    nokogiri (1.18.1-x86_64-linux-gnu)
+    nokogiri (1.18.3-x86_64-linux-gnu)
       racc (~> 1.4)
-    parallel (1.26.3)
+    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)
+    ruby-rc4 (0.1.5)
+    traces (0.15.2)
+    ttfunk (1.8.0)
+      bigdecimal (~> 3.1)
     typhoeus (1.4.1)
       ethon (>= 0.9.0)
     yell (2.2.2)
-    zeitwerk (2.7.1)
+    zeitwerk (2.7.2)
 
 PLATFORMS
   aarch64-linux-gnu
   x86_64-linux
 
 DEPENDENCIES
-  html-proofer (< 4.4)
+  html-proofer (< 5.1)
 
 BUNDLED WITH
    2.6.2