diff --git a/Gemfile.lock b/Gemfile.lock
index 6ca2ace7f..8fb72e806 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -110,7 +110,7 @@ GEM
       activesupport (>= 4.2.0)
     govuk-content-schema-test-helpers (1.6.1)
       json-schema (~> 2.8.0)
-    govuk_app_config (2.8.4)
+    govuk_app_config (2.9.1)
       logstasher (>= 1.2.2, < 2.2.0)
       sentry-raven (~> 3.1.1)
       statsd-ruby (~> 1.5.0)