diff --git a/.ruby-version b/.ruby-version
index 7921bd0c89..c4e41f9459 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-3.4.8
+4.0.3
diff --git a/Dockerfile b/Dockerfile
index aff0ae395a..b432477fd9 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM ruby:3.4.7
+FROM ruby:4.0.3
 ENV LANG=C.UTF-8
 ENV ENABLE_SERVICE_WORKER=true
 
diff --git a/Dockerfile-alpine b/Dockerfile-alpine
index b82d4dc49a..c353a1167f 100644
--- a/Dockerfile-alpine
+++ b/Dockerfile-alpine
@@ -1,4 +1,4 @@
-FROM ruby:3.4.7-alpine
+FROM ruby:4.0.3-alpine
 
 ENV LANG=C.UTF-8
 ENV ENABLE_SERVICE_WORKER=true
diff --git a/Gemfile b/Gemfile
index 985263f1f4..6494f3c989 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,8 +1,9 @@
 source 'https://rubygems.org'
-ruby '3.4.8'
+ruby '4.0.3'
 
 gem 'activesupport', require: false
-gem 'html-pipeline'
+gem 'html-pipeline', '~> 2.14'
+gem 'ostruct'
 gem 'nokogiri'
 gem 'pry-byebug'
 gem 'rake'
@@ -55,3 +56,5 @@ if ENV['SELENIUM'] == '1'
   gem 'capybara'
   gem 'selenium-webdriver'
 end
+
+gem "webrick", "~> 1.9"
diff --git a/Gemfile.lock b/Gemfile.lock
index 81cecfff1e..8067a53408 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,52 +1,49 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    actionpack (7.2.3)
-      actionview (= 7.2.3)
-      activesupport (= 7.2.3)
-      cgi
+    actionpack (8.1.3)
+      actionview (= 8.1.3)
+      activesupport (= 8.1.3)
       nokogiri (>= 1.8.5)
-      racc
-      rack (>= 2.2.4, < 3.3)
+      rack (>= 2.2.4)
       rack-session (>= 1.0.1)
       rack-test (>= 0.6.3)
       rails-dom-testing (~> 2.2)
       rails-html-sanitizer (~> 1.6)
       useragent (~> 0.16)
-    actionview (7.2.3)
-      activesupport (= 7.2.3)
+    actionview (8.1.3)
+      activesupport (= 8.1.3)
       builder (~> 3.1)
-      cgi
       erubi (~> 1.11)
       rails-dom-testing (~> 2.2)
       rails-html-sanitizer (~> 1.6)
-    activesupport (7.2.3)
+    activesupport (8.1.3)
       base64
-      benchmark (>= 0.3)
       bigdecimal
       concurrent-ruby (~> 1.0, >= 1.3.1)
       connection_pool (>= 2.2.5)
       drb
       i18n (>= 1.6, < 2)
+      json
       logger (>= 1.4.2)
       minitest (>= 5.1)
       securerandom (>= 0.3)
       tzinfo (~> 2.0, >= 2.0.5)
-    base64 (0.2.0)
-    benchmark (0.3.0)
+      uri (>= 0.13.1)
+    base64 (0.3.0)
     better_errors (2.10.1)
       erubi (>= 1.0.0)
       rack (>= 0.9.0)
       rouge (>= 1.0.0)
-    bigdecimal (3.1.9)
-    browser (5.3.1)
+    bigdecimal (4.1.2)
+    browser (6.2.0)
     builder (3.3.0)
-    byebug (12.0.0)
-    cgi (0.5.1)
+    byebug (13.0.0)
+      reline (>= 0.6.0)
     chunky_png (1.4.0)
     coderay (1.1.3)
-    concurrent-ruby (1.3.5)
-    connection_pool (2.4.1)
+    concurrent-ruby (1.3.6)
+    connection_pool (3.0.2)
     crass (1.0.6)
     daemons (1.4.1)
     dartsass-sprockets (3.2.1)
@@ -58,59 +55,120 @@ GEM
     date (3.5.1)
     docile (1.4.1)
     drb (2.2.3)
-    erb (6.0.1)
+    erb (6.0.4)
     erubi (1.13.1)
     ethon (0.18.0)
       ffi (>= 1.15.0)
       logger
     eventmachine (1.2.7)
-    execjs (2.9.1)
-    exifr (1.4.0)
-    ffi (1.17.3)
+    execjs (2.10.1)
+    exifr (1.5.1)
+    ffi (1.17.4-aarch64-linux-gnu)
+    ffi (1.17.4-aarch64-linux-musl)
+    ffi (1.17.4-arm-linux-gnu)
+    ffi (1.17.4-arm-linux-musl)
+    ffi (1.17.4-arm64-darwin)
+    ffi (1.17.4-x86_64-darwin)
+    ffi (1.17.4-x86_64-linux-gnu)
+    ffi (1.17.4-x86_64-linux-musl)
     fspath (3.1.2)
-    google-protobuf (4.33.4)
+    google-protobuf (4.34.1)
       bigdecimal
-      rake (>= 13)
+      rake (~> 13.3)
+    google-protobuf (4.34.1-aarch64-linux-gnu)
+      bigdecimal
+      rake (~> 13.3)
+    google-protobuf (4.34.1-aarch64-linux-musl)
+      bigdecimal
+      rake (~> 13.3)
+    google-protobuf (4.34.1-arm64-darwin)
+      bigdecimal
+      rake (~> 13.3)
+    google-protobuf (4.34.1-x86_64-darwin)
+      bigdecimal
+      rake (~> 13.3)
+    google-protobuf (4.34.1-x86_64-linux-gnu)
+      bigdecimal
+      rake (~> 13.3)
+    google-protobuf (4.34.1-x86_64-linux-musl)
+      bigdecimal
+      rake (~> 13.3)
     highline (3.1.2)
       reline
     html-pipeline (2.14.3)
       activesupport (>= 2)
       nokogiri (>= 1.4)
-    i18n (1.14.7)
+    i18n (1.14.8)
       concurrent-ruby (~> 1.0)
-    image_optim (0.31.3)
+    image_optim (0.31.4)
       exifr (~> 1.2, >= 1.2.2)
       fspath (~> 3.0)
       image_size (>= 1.5, < 4)
       in_threads (~> 1.3)
       progress (~> 3.0, >= 3.0.1)
-    image_optim_pack (0.10.1)
+    image_optim_pack (0.13.1.20260418)
+      fspath (>= 2.1, < 4)
+      image_optim (~> 0.19)
+    image_optim_pack (0.13.1.20260418-aarch64-linux)
+      fspath (>= 2.1, < 4)
+      image_optim (~> 0.19)
+    image_optim_pack (0.13.1.20260418-aarch64-linux-gnu)
+      fspath (>= 2.1, < 4)
+      image_optim (~> 0.19)
+    image_optim_pack (0.13.1.20260418-aarch64-linux-musl)
+      fspath (>= 2.1, < 4)
+      image_optim (~> 0.19)
+    image_optim_pack (0.13.1.20260418-arm64-darwin)
+      fspath (>= 2.1, < 4)
+      image_optim (~> 0.19)
+    image_optim_pack (0.13.1.20260418-x86_64-darwin)
+      fspath (>= 2.1, < 4)
+      image_optim (~> 0.19)
+    image_optim_pack (0.13.1.20260418-x86_64-linux-gnu)
+      fspath (>= 2.1, < 4)
+      image_optim (~> 0.19)
+    image_optim_pack (0.13.1.20260418-x86_64-linux-musl)
       fspath (>= 2.1, < 4)
       image_optim (~> 0.19)
-    image_size (3.3.0)
+    image_size (3.4.0)
     in_threads (1.6.0)
-    io-console (0.8.0)
-    irb (1.16.0)
+    io-console (0.8.2)
+    irb (1.18.0)
       pp (>= 0.6.0)
+      prism (>= 1.3.0)
       rdoc (>= 4.0.0)
       reline (>= 0.4.2)
-    logger (1.6.6)
-    loofah (2.25.0)
+    json (2.19.4)
+    logger (1.7.0)
+    loofah (2.25.1)
       crass (~> 1.0.2)
       nokogiri (>= 1.12.0)
     method_source (1.1.0)
-    mini_portile2 (2.8.9)
-    minitest (6.0.2)
+    minitest (6.0.5)
       drb (~> 2.0)
       prism (~> 1.5)
-    multi_json (1.15.0)
-    mustermann (3.0.3)
-      ruby2_keywords (~> 0.0.1)
-    newrelic_rpm (8.16.0)
-    nokogiri (1.19.1)
-      mini_portile2 (~> 2.8.2)
+    multi_json (1.20.1)
+    mustermann (3.1.1)
+    newrelic_rpm (10.4.0)
+      logger
+    nokogiri (1.19.2-aarch64-linux-gnu)
+      racc (~> 1.4)
+    nokogiri (1.19.2-aarch64-linux-musl)
+      racc (~> 1.4)
+    nokogiri (1.19.2-arm-linux-gnu)
+      racc (~> 1.4)
+    nokogiri (1.19.2-arm-linux-musl)
+      racc (~> 1.4)
+    nokogiri (1.19.2-arm64-darwin)
+      racc (~> 1.4)
+    nokogiri (1.19.2-x86_64-darwin)
+      racc (~> 1.4)
+    nokogiri (1.19.2-x86_64-linux-gnu)
+      racc (~> 1.4)
+    nokogiri (1.19.2-x86_64-linux-musl)
       racc (~> 1.4)
     options (2.3.2)
+    ostruct (0.6.3)
     pp (0.6.3)
       prettyprint
     prettyprint (0.2.0)
@@ -119,81 +177,96 @@ GEM
     progress_bar (1.3.4)
       highline (>= 1.6)
       options (~> 2.3.0)
-    pry (0.15.2)
+    pry (0.16.0)
       coderay (~> 1.1)
       method_source (~> 1.0)
-    pry-byebug (3.11.0)
-      byebug (~> 12.0)
-      pry (>= 0.13, < 0.16)
+      reline (>= 0.6.0)
+    pry-byebug (3.12.0)
+      byebug (~> 13.0)
+      pry (>= 0.13, < 0.17)
     psych (5.3.1)
       date
       stringio
     racc (1.8.1)
-    rack (2.2.22)
-    rack-protection (3.2.0)
+    rack (3.2.6)
+    rack-protection (4.2.1)
+      base64 (>= 0.1.0)
+      logger (>= 1.6.0)
+      rack (>= 3.0.0, < 4)
+    rack-session (2.1.2)
       base64 (>= 0.1.0)
-      rack (~> 2.2, >= 2.2.4)
-    rack-session (1.0.2)
-      rack (< 3)
+      rack (>= 3.0.0)
     rack-ssl-enforcer (0.2.9)
     rack-test (2.2.0)
       rack (>= 1.3)
-    rackup (1.0.1)
-      rack (< 3)
-      webrick
+    rackup (2.3.1)
+      rack (>= 3)
     rails-dom-testing (2.3.0)
       activesupport (>= 5.0.0)
       minitest
       nokogiri (>= 1.6)
-    rails-html-sanitizer (1.6.2)
-      loofah (~> 2.21)
+    rails-html-sanitizer (1.7.0)
+      loofah (~> 2.25)
       nokogiri (>= 1.15.7, != 1.16.7, != 1.16.6, != 1.16.5, != 1.16.4, != 1.16.3, != 1.16.2, != 1.16.1, != 1.16.0.rc1, != 1.16.0)
-    railties (7.2.3)
-      actionpack (= 7.2.3)
-      activesupport (= 7.2.3)
-      cgi
+    railties (8.1.3)
+      actionpack (= 8.1.3)
+      activesupport (= 8.1.3)
       irb (~> 1.13)
       rackup (>= 1.0.0)
       rake (>= 12.2)
       thor (~> 1.0, >= 1.2.2)
       tsort (>= 0.2)
       zeitwerk (~> 2.6)
-    rake (13.3.1)
-    rdoc (7.1.0)
+    rake (13.4.2)
+    rdoc (7.2.0)
       erb
       psych (>= 4.0.0)
       tsort
     redcarpet (3.6.1)
-    reline (0.6.0)
+    reline (0.6.3)
       io-console (~> 0.5)
-    rexml (3.3.9)
-    rouge (1.11.1)
+    rexml (3.4.4)
+    rouge (4.7.0)
     rr (3.1.2)
-    rss (0.3.1)
+    rss (0.3.2)
       rexml
-    ruby2_keywords (0.0.5)
-    sass-embedded (1.97.3)
+    sass-embedded (1.99.0-aarch64-linux-gnu)
+      google-protobuf (~> 4.31)
+    sass-embedded (1.99.0-aarch64-linux-musl)
+      google-protobuf (~> 4.31)
+    sass-embedded (1.99.0-arm-linux-gnueabihf)
+      google-protobuf (~> 4.31)
+    sass-embedded (1.99.0-arm-linux-musleabihf)
+      google-protobuf (~> 4.31)
+    sass-embedded (1.99.0-arm64-darwin)
+      google-protobuf (~> 4.31)
+    sass-embedded (1.99.0-x86_64-darwin)
+      google-protobuf (~> 4.31)
+    sass-embedded (1.99.0-x86_64-linux-gnu)
+      google-protobuf (~> 4.31)
+    sass-embedded (1.99.0-x86_64-linux-musl)
       google-protobuf (~> 4.31)
-      rake (>= 13)
     sassc-embedded (1.80.8)
       sass-embedded (~> 1.80)
-    securerandom (0.3.2)
+    securerandom (0.4.1)
     simplecov (0.22.0)
       docile (~> 1.1)
       simplecov-html (~> 0.11)
       simplecov_json_formatter (~> 0.1)
     simplecov-html (0.13.2)
     simplecov_json_formatter (0.1.4)
-    sinatra (3.2.0)
+    sinatra (4.2.1)
+      logger (>= 1.6.0)
       mustermann (~> 3.0)
-      rack (~> 2.2, >= 2.2.4)
-      rack-protection (= 3.2.0)
+      rack (>= 3.0.0, < 4)
+      rack-protection (= 4.2.1)
+      rack-session (>= 2.0.0, < 3)
       tilt (~> 2.0)
-    sinatra-contrib (3.2.0)
+    sinatra-contrib (4.2.1)
       multi_json (>= 0.0.2)
       mustermann (~> 3.0)
-      rack-protection (= 3.2.0)
-      sinatra (= 3.2.0)
+      rack-protection (= 4.2.1)
+      sinatra (= 4.2.1)
       tilt (~> 2.0)
     sprockets (4.2.2)
       concurrent-ruby (~> 1.0)
@@ -211,35 +284,47 @@ GEM
       unicode-display_width (>= 1.5, < 3.0)
       unicode_utils (~> 1.4)
     strings-ansi (0.2.0)
-    terminal-table (3.0.2)
-      unicode-display_width (>= 1.1.1, < 3)
-    terser (1.2.6)
+    terminal-table (4.0.0)
+      unicode-display_width (>= 1.1.1, < 4)
+    terser (1.2.7)
       execjs (>= 0.3.0, < 3)
-    thin (1.8.2)
+    thin (2.0.1)
       daemons (~> 1.0, >= 1.0.9)
       eventmachine (~> 1.0, >= 1.0.4)
-      rack (>= 1, < 3)
-    thor (1.4.0)
-    tilt (2.6.0)
+      logger
+      rack (>= 1, < 4)
+    thor (1.5.0)
+    tilt (2.7.0)
     tsort (0.2.0)
     tty-pager (0.14.0)
       strings (~> 0.2.0)
       tty-screen (~> 0.8)
-    tty-screen (0.8.1)
+    tty-screen (0.8.2)
     typhoeus (1.6.0)
       ethon (>= 0.18.0)
     tzinfo (2.0.6)
       concurrent-ruby (~> 1.0)
-    unicode-display_width (2.3.0)
+    unicode-display_width (2.6.0)
     unicode_utils (1.4.0)
     unix_utils (0.0.15)
+    uri (1.1.1)
     useragent (0.16.11)
     webrick (1.9.2)
     yajl-ruby (1.4.3)
-    zeitwerk (2.7.4)
+    zeitwerk (2.7.5)
 
 PLATFORMS
-  ruby
+  aarch64-linux
+  aarch64-linux-gnu
+  aarch64-linux-musl
+  arm-linux-gnu
+  arm-linux-gnueabihf
+  arm-linux-musl
+  arm-linux-musleabihf
+  arm64-darwin
+  x86_64-darwin
+  x86_64-linux-gnu
+  x86_64-linux-musl
 
 DEPENDENCIES
   activesupport
@@ -248,12 +333,13 @@ DEPENDENCIES
   chunky_png
   dartsass-sprockets
   erubi
-  html-pipeline
+  html-pipeline (~> 2.14)
   image_optim
   image_optim_pack
   minitest
   newrelic_rpm
   nokogiri
+  ostruct
   progress_bar
   pry-byebug
   rack
@@ -275,10 +361,153 @@ DEPENDENCIES
   tty-pager
   typhoeus
   unix_utils
+  webrick (~> 1.9)
   yajl-ruby
 
+CHECKSUMS
+  actionpack (8.1.3) sha256=af998cae4d47c5d581a2cc363b5c77eb718b7c4b45748d81b1887b25621c29a3
+  actionview (8.1.3) sha256=1347c88c7f3edb38100c5ce0e9fb5e62d7755f3edc1b61cce2eb0b2c6ea2fd5d
+  activesupport (8.1.3) sha256=21a5e0dfbd4c3ddd9e1317ec6a4d782fa226e7867dc70b0743acda81a1dca20e
+  base64 (0.3.0) sha256=27337aeabad6ffae05c265c450490628ef3ebd4b67be58257393227588f5a97b
+  better_errors (2.10.1) sha256=f798f1bac93f3e775925b7fcb24cffbcf0bb62ee2210f5350f161a6b75fc0a73
+  bigdecimal (4.1.2) sha256=53d217666027eab4280346fba98e7d5b66baaae1b9c3c1c0ffe89d48188a3fbd
+  browser (6.2.0) sha256=281d5295788825c9396427c292c2d2be0a5c91875c93c390fde6e5d61a5ace2d
+  builder (3.3.0) sha256=497918d2f9dca528fdca4b88d84e4ef4387256d984b8154e9d5d3fe5a9c8835f
+  byebug (13.0.0) sha256=d2263efe751941ca520fa29744b71972d39cbc41839496706f5d9b22e92ae05d
+  chunky_png (1.4.0) sha256=89d5b31b55c0cf4da3cf89a2b4ebc3178d8abe8cbaf116a1dba95668502fdcfe
+  coderay (1.1.3) sha256=dc530018a4684512f8f38143cd2a096c9f02a1fc2459edcfe534787a7fc77d4b
+  concurrent-ruby (1.3.6) sha256=6b56837e1e7e5292f9864f34b69c5a2cbc75c0cf5338f1ce9903d10fa762d5ab
+  connection_pool (3.0.2) sha256=33fff5ba71a12d2aa26cb72b1db8bba2a1a01823559fb01d29eb74c286e62e0a
+  crass (1.0.6) sha256=dc516022a56e7b3b156099abc81b6d2b08ea1ed12676ac7a5657617f012bd45d
+  daemons (1.4.1) sha256=8fc76d76faec669feb5e455d72f35bd4c46dc6735e28c420afb822fac1fa9a1d
+  dartsass-sprockets (3.2.1) sha256=5163c59d155bfb834e2554bec00e2ff9ab97ad3ea82545cbacf650cf0469f3c3
+  date (3.5.1) sha256=750d06384d7b9c15d562c76291407d89e368dda4d4fff957eb94962d325a0dc0
+  docile (1.4.1) sha256=96159be799bfa73cdb721b840e9802126e4e03dfc26863db73647204c727f21e
+  drb (2.2.3) sha256=0b00d6fdb50995fe4a45dea13663493c841112e4068656854646f418fda13373
+  erb (6.0.4) sha256=38e3803694be357fe2bfe312487c74beaf9fb4e5beb3e22498952fe1645b95d9
+  erubi (1.13.1) sha256=a082103b0885dbc5ecf1172fede897f9ebdb745a4b97a5e8dc63953db1ee4ad9
+  ethon (0.18.0) sha256=b598afc9f30448cb068b850714b7d6948e941476095d04f90a4ac65b8d6efcb2
+  eventmachine (1.2.7) sha256=994016e42aa041477ba9cff45cbe50de2047f25dd418eba003e84f0d16560972
+  execjs (2.10.1) sha256=abe0ae028467eb8e30c10814eb934d07876a691aae7e803d813b7ce5a75e73f1
+  exifr (1.5.1) sha256=ad87a5dbc92946fbf1d8ccd178d557d95d9168e8b3c5c5f381ea2bffcc312521
+  ffi (1.17.4-aarch64-linux-gnu) sha256=b208f06f91ffd8f5e1193da3cae3d2ccfc27fc36fba577baf698d26d91c080df
+  ffi (1.17.4-aarch64-linux-musl) sha256=9286b7a615f2676245283aef0a0a3b475ae3aae2bb5448baace630bb77b91f39
+  ffi (1.17.4-arm-linux-gnu) sha256=d6dbddf7cb77bf955411af5f187a65b8cd378cb003c15c05697f5feee1cb1564
+  ffi (1.17.4-arm-linux-musl) sha256=9d4838ded0465bef6e2426935f6bcc93134b6616785a84ffd2a3d82bc3cf6f95
+  ffi (1.17.4-arm64-darwin) sha256=19071aaf1419251b0a46852abf960e77330a3b334d13a4ab51d58b31a937001b
+  ffi (1.17.4-x86_64-darwin) sha256=aa70390523cf3235096cf64962b709b4cfbd5c082a2cb2ae714eb0fe2ccda496
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+
 RUBY VERSION
-   ruby 3.4.8p72
+  ruby 4.0.3
 
 BUNDLED WITH
-   2.4.6
+  4.0.10
diff --git a/test/lib/docs/filters/core/images_test.rb b/test/lib/docs/filters/core/images_test.rb
index 6a8522c881..2763b18cfe 100644
--- a/test/lib/docs/filters/core/images_test.rb
+++ b/test/lib/docs/filters/core/images_test.rb
@@ -1,5 +1,6 @@
 require_relative '../../../../test_helper'
 require_relative '../../../../../lib/docs'
+require 'ostruct'
 
 class ImagesFilterTest < Minitest::Spec
   include FilterTestHelper