diff --git a/Gemfile.lock b/Gemfile.lock
index 189d6b31d..a70aa190f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -133,8 +133,9 @@ GEM
     globalid (0.5.2)
       activesupport (>= 5.0)
     govuk_ab_testing (2.4.2)
-    govuk_app_config (4.0.1)
+    govuk_app_config (4.1.0)
       logstasher (>= 1.2.2, < 2.2.0)
+      puma (~> 5.0)
       sentry-rails (~> 4.5.0)
       sentry-ruby (~> 4.5.0)
       statsd-ruby (~> 1.5.0)