diff --git a/lib/govuk_app_config/govuk_prometheus_exporter.rb b/lib/govuk_app_config/govuk_prometheus_exporter.rb
index a452561..0e2be64 100644
--- a/lib/govuk_app_config/govuk_prometheus_exporter.rb
+++ b/lib/govuk_app_config/govuk_prometheus_exporter.rb
@@ -11,13 +11,19 @@ def self.should_configure
     end
   end
 
-  def self.configure(collectors: [])
+  def self.configure(collectors: [], default_aggregation: Prometheus::Metric::Histogram)
     return unless should_configure
 
     require "prometheus_exporter"
     require "prometheus_exporter/server"
     require "prometheus_exporter/middleware"
 
+    # PrometheusExporter::Metric::Histogram.DEFAULT_BUCKETS tops out at 10 but
+    # we have a few controller actions which are slower than this, so we add a
+    # few extra buckets for slower requests
+    PrometheusExporter::Metric::Histogram.default_buckets = [0.005, 0.01, 0.025, 0.05, 0.1, 0.25, 0.5, 1, 2.5, 5, 10, 15, 25, 50].freeze
+    PrometheusExporter::Metric::Base.default_aggregation = default_aggregation
+
     if defined?(Sidekiq)
       Sidekiq.configure_server do |config|
         require "sidekiq/api"