diff --git a/CHANGELOG.md b/CHANGELOG.md
index 041f34d..3b87ca2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+# 8.1.1
+
+* Fix prometheus_exporter to method patching compatible with open telemetry.
+
 # 8.1.0
 
 * Add ability to enable Open Telemetry instrumentation for Rails applications.
diff --git a/lib/govuk_app_config/govuk_prometheus_exporter.rb b/lib/govuk_app_config/govuk_prometheus_exporter.rb
index aa3a271..d72321d 100644
--- a/lib/govuk_app_config/govuk_prometheus_exporter.rb
+++ b/lib/govuk_app_config/govuk_prometheus_exporter.rb
@@ -40,7 +40,7 @@ def self.configure
       server.start
 
       if defined?(Rails)
-        Rails.application.middleware.unshift PrometheusExporter::Middleware
+        Rails.application.middleware.unshift PrometheusExporter::Middleware, instrument: :prepend
       end
 
       if defined?(Sinatra)
diff --git a/lib/govuk_app_config/version.rb b/lib/govuk_app_config/version.rb
index 5cb54b3..b89202b 100644
--- a/lib/govuk_app_config/version.rb
+++ b/lib/govuk_app_config/version.rb
@@ -1,3 +1,3 @@
 module GovukAppConfig
-  VERSION = "8.1.0".freeze
+  VERSION = "8.1.1".freeze
 end