diff --git a/Gemfile b/Gemfile
index c227021..93c6707 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,7 +2,7 @@ source 'https://rubygems.org'
 
 gem 'faraday', '~> 1.0.0'
 gem 'govuk-lint', '~> 4.0.1'
-gem 'govuk_tech_docs', '~> 2.2.2'
+gem 'govuk_tech_docs', '~> 2.4.2'
 gem 'mini_racer', '~> 0.3.1'
 
 group :test do
diff --git a/Gemfile.lock b/Gemfile.lock
index fb67034..53c7ba5 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,7 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    activesupport (5.2.4.5)
+    activesupport (5.2.6)
       concurrent-ruby (~> 1.0, >= 1.0.2)
       i18n (>= 0.7, < 2)
       minitest (~> 5.1)
@@ -9,17 +9,16 @@ GEM
     addressable (2.8.0)
       public_suffix (>= 2.0.2, < 5.0)
     ast (2.4.0)
-    autoprefixer-rails (9.8.6.5)
-      execjs
-    backports (3.20.2)
+    autoprefixer-rails (10.2.5.1)
+      execjs (> 0)
+    backports (3.21.0)
     chronic (0.10.2)
     chunky_png (1.4.0)
     coffee-script (2.4.1)
       coffee-script-source
       execjs
     coffee-script-source (1.12.2)
-    commonmarker (0.21.2)
-      ruby-enum (~> 0.5)
+    commonmarker (0.22.0)
     compass (1.0.3)
       chunky_png (~> 1.2)
       compass-core (~> 1.0.2)
@@ -32,7 +31,7 @@ GEM
       sass (>= 3.3.0, < 3.5)
     compass-import-once (1.0.5)
       sass (>= 3.2, < 3.5)
-    concurrent-ruby (1.1.8)
+    concurrent-ruby (1.1.9)
     contracts (0.13.0)
     crack (0.4.3)
       safe_yaml (~> 1.0.0)
@@ -43,18 +42,19 @@ GEM
       http_parser.rb (~> 0.6.0)
     erubis (2.7.0)
     eventmachine (1.2.7)
-    execjs (2.7.0)
+    execjs (2.8.1)
     faraday (1.0.0)
       multipart-post (>= 1.2, < 3)
     fast_blank (1.0.0)
-    fastimage (2.2.3)
-    ffi (1.15.0)
+    fastimage (2.2.4)
+    ffi (1.15.3)
     govuk-lint (4.0.1)
       rubocop (~> 0.72)
       rubocop-rails (~> 2)
       rubocop-rspec (~> 1.28)
       scss_lint
-    govuk_tech_docs (2.2.2)
+    govuk_tech_docs (2.4.2)
+      autoprefixer-rails (~> 10.2)
       chronic (~> 0.10.2)
       middleman (~> 4.0)
       middleman-autoprefixer (~> 2.10.0)
@@ -65,8 +65,8 @@ GEM
       middleman-syntax (~> 3.2.0)
       nokogiri
       openapi3_parser (~> 0.9.0)
-      redcarpet (~> 3.5.0)
-    haml (5.2.1)
+      redcarpet (~> 3.5.1)
+    haml (5.2.2)
       temple (>= 0.8.0)
       tilt
     hamster (3.0.0)
@@ -90,8 +90,8 @@ GEM
       kramdown (>= 2.3.0)
       middleman-cli (= 4.3.11)
       middleman-core (= 4.3.11)
-    middleman-autoprefixer (2.10.1)
-      autoprefixer-rails (~> 9.1)
+    middleman-autoprefixer (2.10.0)
+      autoprefixer-rails (>= 9.1.4)
       middleman-core (>= 3.3.3)
     middleman-cli (4.3.11)
       thor (>= 0.17.0, < 2.0)
@@ -121,7 +121,7 @@ GEM
       servolux
       tilt (~> 2.0.9)
       uglifier (~> 3.0)
-    middleman-livereload (3.4.6)
+    middleman-livereload (3.4.7)
       em-websocket (~> 0.5.1)
       middleman-core (>= 3.3)
       rack-livereload (~> 0.3.15)
@@ -135,13 +135,13 @@ GEM
     middleman-syntax (3.2.0)
       middleman-core (>= 3.2)
       rouge (~> 3.2)
-    mini_portile2 (2.5.1)
+    mini_portile2 (2.5.3)
     mini_racer (0.3.1)
       libv8 (~> 8.4.255)
     minitest (5.14.4)
     multi_json (1.15.0)
     multipart-post (2.1.1)
-    nokogiri (1.11.4)
+    nokogiri (1.11.7)
       mini_portile2 (~> 2.5.0)
       racc (~> 1.4)
     openapi3_parser (0.9.0)
@@ -156,7 +156,7 @@ GEM
     parallel (1.19.1)
     parser (2.6.5.0)
       ast (~> 2.4.0)
-    psych (3.3.1)
+    psych (3.3.2)
     public_suffix (4.0.6)
     racc (1.5.2)
     rack (2.2.3)
@@ -164,7 +164,7 @@ GEM
       rack
     rainbow (3.0.0)
     rake (12.3.3)
-    rb-fsevent (0.10.4)
+    rb-fsevent (0.11.0)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
     redcarpet (3.5.1)
@@ -195,8 +195,6 @@ GEM
       rubocop (>= 0.72.0)
     rubocop-rspec (1.36.0)
       rubocop (>= 0.68.1)
-    ruby-enum (0.9.0)
-      i18n
     ruby-progressbar (1.10.1)
     safe_yaml (1.0.5)
     sass (3.4.25)
@@ -229,7 +227,7 @@ PLATFORMS
 DEPENDENCIES
   faraday (~> 1.0.0)
   govuk-lint (~> 4.0.1)
-  govuk_tech_docs (~> 2.2.2)
+  govuk_tech_docs (~> 2.4.2)
   mini_racer (~> 0.3.1)
   rspec (~> 3.9.0)
   webmock (~> 3.8.2)
diff --git a/source/accessibility.html.md b/source/accessibility.html.md
index 473488e..c6b6316 100644
--- a/source/accessibility.html.md
+++ b/source/accessibility.html.md
@@ -1,6 +1,6 @@
 ---
 title: Accessibility statement for GOV.UK Notify’s documentation
-last_reviewed_on: 2021-07-02
+last_reviewed_on: 2021-07-29
 review_in: 6 months
 hide_in_navigation: true
 ---
@@ -82,6 +82,6 @@ We plan to look at the redundant links by the end of September 2021.
 
 ## Preparation of this accessibility statement
 
-This statement was prepared on 3 September 2020. It was last reviewed on 2 July 2021.
+This statement was prepared on 3 September 2020. It was last reviewed on 29 July 2021.
 
 This website was last tested in August 2020. The test was carried out by the technical writing team at GDS. We used the [WAVE Web Accessibility Evaluation Tool](https://wave.webaim.org/) and a checklist we created with the help of the GDS accessibility team. We tested a selection of the website’s pages.