diff --git a/Gemfile.lock b/Gemfile.lock
index 1c23f5258..dd527cf66 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -176,7 +176,7 @@ GEM
     googleapis-common-protos-types (1.16.0)
       google-protobuf (>= 3.18, < 5.a)
     govuk_ab_testing (3.0.0)
-    govuk_app_config (9.15.4)
+    govuk_app_config (9.15.5)
       logstasher (~> 2.1)
       opentelemetry-exporter-otlp (>= 0.25, < 0.30)
       opentelemetry-instrumentation-all (>= 0.39.1, < 0.70.0)