diff --git a/Gemfile.lock b/Gemfile.lock
index 5ee616c..4721e16 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,25 +1,23 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    activesupport (5.0.7.2)
+    activesupport (5.2.8.1)
       concurrent-ruby (~> 1.0, >= 1.0.2)
       i18n (>= 0.7, < 2)
       minitest (~> 5.1)
       tzinfo (~> 1.1)
-    addressable (2.6.0)
-      public_suffix (>= 2.0.2, < 4.0)
-    autoprefixer-rails (6.7.7.2)
-      execjs
-    backports (3.14.0)
+    addressable (2.8.1)
+      public_suffix (>= 2.0.2, < 6.0)
+    autoprefixer-rails (10.4.7.0)
+      execjs (~> 2)
+    backports (3.23.0)
     chronic (0.10.2)
-    chunky_png (1.3.11)
-    coderay (1.1.2)
+    chunky_png (1.4.0)
     coffee-script (2.4.1)
       coffee-script-source
       execjs
     coffee-script-source (1.12.2)
-    commonmarker (0.20.1)
-      ruby-enum (~> 0.5)
+    commonmarker (0.23.6)
     compass (1.0.3)
       chunky_png (~> 1.2)
       compass-core (~> 1.0.2)
@@ -32,63 +30,63 @@ GEM
       sass (>= 3.3.0, < 3.5)
     compass-import-once (1.0.5)
       sass (>= 3.2, < 3.5)
-    concurrent-ruby (1.1.5)
+    concurrent-ruby (1.1.10)
     contracts (0.13.0)
-    dotenv (2.7.2)
-    em-websocket (0.5.1)
+    dotenv (2.8.1)
+    em-websocket (0.5.3)
       eventmachine (>= 0.12.9)
-      http_parser.rb (~> 0.6.0)
+      http_parser.rb (~> 0)
     erubis (2.7.0)
     eventmachine (1.2.7)
-    execjs (2.7.0)
-    fast_blank (1.0.0)
-    fastimage (2.1.5)
-    ffi (1.10.0)
-    govuk_tech_docs (1.8.2)
-      activesupport
+    execjs (2.8.1)
+    fast_blank (1.0.1)
+    fastimage (2.2.6)
+    ffi (1.15.5)
+    govuk_tech_docs (2.4.3)
+      autoprefixer-rails (~> 10.2)
       chronic (~> 0.10.2)
       middleman (~> 4.0)
-      middleman-autoprefixer (~> 2.7.0)
+      middleman-autoprefixer (~> 2.10.0)
       middleman-compass (>= 4.0.0)
       middleman-livereload
       middleman-search-gds
       middleman-sprockets (~> 4.0.0)
-      middleman-syntax (~> 3.0.0)
+      middleman-syntax (~> 3.2.0)
       nokogiri
-      openapi3_parser
-      pry
-      redcarpet (~> 3.3.2)
-    haml (5.0.4)
-      temple (>= 0.8.0)
+      openapi3_parser (~> 0.9.0)
+      redcarpet (~> 3.5.1)
+    haml (6.1.1)
+      temple (>= 0.8.2)
+      thor
       tilt
     hamster (3.0.0)
       concurrent-ruby (~> 1.0)
     hashie (3.6.0)
-    http_parser.rb (0.6.0)
+    http_parser.rb (0.8.0)
     i18n (0.9.5)
       concurrent-ruby (~> 1.0)
-    kramdown (1.17.0)
+    kramdown (2.4.0)
+      rexml
     listen (3.0.8)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
-    memoist (0.16.0)
-    method_source (0.9.2)
-    middleman (4.3.3)
+    memoist (0.16.2)
+    middleman (4.3.11)
       coffee-script (~> 2.2)
       haml (>= 4.0.5)
-      kramdown (~> 1.2)
-      middleman-cli (= 4.3.3)
-      middleman-core (= 4.3.3)
-    middleman-autoprefixer (2.7.1)
-      autoprefixer-rails (>= 6.5.2, < 7.0.0)
+      kramdown (>= 2.3.0)
+      middleman-cli (= 4.3.11)
+      middleman-core (= 4.3.11)
+    middleman-autoprefixer (2.10.0)
+      autoprefixer-rails (>= 9.1.4)
       middleman-core (>= 3.3.3)
-    middleman-cli (4.3.3)
+    middleman-cli (4.3.11)
       thor (>= 0.17.0, < 2.0)
     middleman-compass (4.0.1)
       compass (>= 1.0.0, < 2.0.0)
       middleman-core (>= 4.0.0)
-    middleman-core (4.3.3)
-      activesupport (>= 4.2, < 5.1)
+    middleman-core (4.3.11)
+      activesupport (>= 4.2, < 6.0)
       addressable (~> 2.3)
       backports (~> 3.6)
       bundler
@@ -110,26 +108,27 @@ 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)
-    middleman-search-gds (0.11.0a)
+    middleman-search-gds (0.11.1)
       execjs (~> 2.6)
       middleman-core (>= 3.2)
       nokogiri (~> 1.6)
     middleman-sprockets (4.0.0)
       middleman-core (~> 4.0)
       sprockets (>= 3.0)
-    middleman-syntax (3.0.0)
+    middleman-syntax (3.2.0)
       middleman-core (>= 3.2)
-      rouge (~> 2.0)
-    mini_portile2 (2.4.0)
-    minitest (5.11.3)
-    multi_json (1.13.1)
-    nokogiri (1.10.5)
-      mini_portile2 (~> 2.4.0)
-    openapi3_parser (0.5.2)
+      rouge (~> 3.2)
+    mini_portile2 (2.8.1)
+    minitest (5.17.0)
+    multi_json (1.15.0)
+    nokogiri (1.14.0)
+      mini_portile2 (~> 2.8.0)
+      racc (~> 1.4)
+    openapi3_parser (0.9.2)
       commonmarker (~> 0.17)
     padrino-helpers (0.13.3.4)
       i18n (~> 0.6, >= 0.6.7)
@@ -137,35 +136,30 @@ GEM
       tilt (>= 1.4.1, < 3)
     padrino-support (0.13.3.4)
       activesupport (>= 3.1)
-    parallel (1.17.0)
-    pry (0.12.2)
-      coderay (~> 1.1.0)
-      method_source (~> 0.9.0)
-    public_suffix (3.0.3)
-    rack (2.0.7)
+    parallel (1.22.1)
+    public_suffix (5.0.1)
+    racc (1.6.2)
+    rack (2.2.6.2)
     rack-livereload (0.3.17)
       rack
-    rake (12.3.2)
-    rb-fsevent (0.10.3)
-    rb-inotify (0.10.0)
+    rb-fsevent (0.11.2)
+    rb-inotify (0.10.1)
       ffi (~> 1.0)
-    redcarpet (3.3.4)
-    rouge (2.2.1)
-    ruby-enum (0.7.2)
-      i18n
+    redcarpet (3.5.1)
+    rexml (3.2.5)
+    rouge (3.30.0)
     sass (3.4.25)
-    sassc (2.0.1)
+    sassc (2.4.0)
       ffi (~> 1.9)
-      rake
     servolux (0.13.0)
-    sprockets (3.7.2)
+    sprockets (4.2.0)
       concurrent-ruby (~> 1.0)
-      rack (> 1, < 3)
-    temple (0.8.1)
-    thor (0.20.3)
+      rack (>= 2.2.4, < 4)
+    temple (0.9.1)
+    thor (1.2.1)
     thread_safe (0.3.6)
-    tilt (2.0.9)
-    tzinfo (1.2.5)
+    tilt (2.0.11)
+    tzinfo (1.2.10)
       thread_safe (~> 0.1)
     uglifier (3.2.0)
       execjs (>= 0.3.0, < 3)
@@ -174,9 +168,7 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
-  govuk_tech_docs (~> 1.8.2)
-  tzinfo-data
-  wdm (~> 0.1.0)
+  govuk_tech_docs (~> 2.0, >= 2.0.11)
 
 BUNDLED WITH
    1.17.3