diff --git a/Gemfile b/Gemfile
index 27fb0fc2b..60bc43381 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,7 +4,7 @@ ruby File.read(".ruby-version").strip
 
 gem 'gds-api-adapters', '~> 51.4'
 gem 'govuk_ab_testing', '~> 2.4.1'
-gem 'govuk_app_config', '~> 1.3.2'
+gem 'govuk_app_config', '~> 1.4.0'
 gem 'govuk_frontend_toolkit', '~> 7.4.1'
 gem 'govuk_navigation_helpers', '9.0.0'
 gem 'govuk_publishing_components', '~> 5.2.2'
diff --git a/Gemfile.lock b/Gemfile.lock
index 36a7b3dd7..94e5f5737 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -127,7 +127,7 @@ GEM
       rubocop-rspec (~> 1.19.0)
       scss_lint
     govuk_ab_testing (2.4.1)
-    govuk_app_config (1.3.2)
+    govuk_app_config (1.4.0)
       logstasher (~> 1.2.2)
       sentry-raven (~> 2.7.1)
       statsd-ruby (~> 1.4.0)
@@ -350,7 +350,7 @@ DEPENDENCIES
   govuk-content-schema-test-helpers
   govuk-lint
   govuk_ab_testing (~> 2.4.1)
-  govuk_app_config (~> 1.3.2)
+  govuk_app_config (~> 1.4.0)
   govuk_frontend_toolkit (~> 7.4.1)
   govuk_navigation_helpers (= 9.0.0)
   govuk_publishing_components (~> 5.2.2)