diff --git a/Gemfile b/Gemfile
index 8ad35bcb6..454dc852d 100644
--- a/Gemfile
+++ b/Gemfile
@@ -40,11 +40,11 @@ group :development, :test do
 end
 
 gem 'plek', '1.11.0'
-gem 'govuk_frontend_toolkit', '~> 4.12.0'
+gem 'govuk_frontend_toolkit', '~> 4.18.3'
 
 if ENV['GOVUK_TEMPLATE_DEV']
   gem 'govuk_template', :path => "../govuk_template"
 else
-  gem 'govuk_template', '0.17.3'
+  gem 'govuk_template', '0.18.3'
 end
 gem 'gds-api-adapters', '26.7.0'
diff --git a/Gemfile.lock b/Gemfile.lock
index 3f9987f9e..46c386069 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -85,10 +85,10 @@ GEM
     govuk-lint (0.6.1)
       rubocop (~> 0.35.0)
       scss_lint (~> 0.44.0)
-    govuk_frontend_toolkit (4.12.0)
+    govuk_frontend_toolkit (4.18.3)
       rails (>= 3.1.0)
       sass (>= 3.2.0)
-    govuk_template (0.17.3)
+    govuk_template (0.18.3)
       rails (>= 3.1)
     http-cookie (1.0.2)
       domain_name (~> 0.5)
@@ -256,8 +256,8 @@ DEPENDENCIES
   gds-api-adapters (= 26.7.0)
   govuk-content-schema-test-helpers (~> 1.4)
   govuk-lint (~> 0.6.0)
-  govuk_frontend_toolkit (~> 4.12.0)
-  govuk_template (= 0.17.3)
+  govuk_frontend_toolkit (~> 4.18.3)
+  govuk_template (= 0.18.3)
   image_optim (= 0.17.1)
   jasmine-rails (~> 0.10.6)
   logstasher (= 0.4.8)