diff --git a/Gemfile.lock b/Gemfile.lock
index 7f77642..fee2796 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -39,7 +39,7 @@ GEM
       sass (>= 3.3.0, < 3.5)
     compass-import-once (1.0.5)
       sass (>= 3.2, < 3.5)
-    concurrent-ruby (1.3.4)
+    concurrent-ruby (1.3.7)
     connection_pool (3.0.2)
     contracts (0.16.1)
     csv (3.3.5)
@@ -82,26 +82,25 @@ GEM
     google-protobuf (4.32.1-x86_64-linux-musl)
       bigdecimal
       rake (>= 13)
-    govuk_tech_docs (5.2.2)
-      autoprefixer-rails (~> 10.2)
-      base64
-      bigdecimal
-      chronic (~> 0.10.2)
-      concurrent-ruby (= 1.3.4)
+    govuk_tech_docs (6.3.0)
+      autoprefixer-rails
+      chronic
+      concurrent-ruby
       csv
-      haml (~> 6.0)
-      middleman (~> 4.6.1)
-      middleman-autoprefixer (~> 2.10)
-      middleman-compass (~> 4.0)
+      haml (>= 6, < 8)
+      middleman
+      middleman-autoprefixer
+      middleman-compass
       middleman-livereload
       middleman-search-gds
-      middleman-sprockets (~> 4.0.0)
-      middleman-syntax (~> 3.6)
+      middleman-sprockets (= 4.0.0)
+      middleman-syntax
       mutex_m
       nokogiri
-      openapi3_parser (~> 0.9.0)
-      redcarpet (~> 3.6)
-      sassc-embedded (~> 1.78.0)
+      openapi3_parser
+      redcarpet
+      sassc-embedded
+      schmooze (~> 0.2.0)
       terser (~> 1.2.3)
     haml (6.3.0)
       temple (>= 0.8.2)
@@ -236,6 +235,7 @@ GEM
       ffi (~> 1.9)
     sassc-embedded (1.78.0)
       sass-embedded (~> 1.78)
+    schmooze (0.2.0)
     securerandom (0.4.1)
     servolux (0.13.0)
     sprockets (4.2.2)