diff --git a/.gitignore b/.gitignore
index e47bde0..7b32200 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,3 +8,5 @@
 /spec/reports/
 /tmp/
 spec/examples.txt
+# simplecov
+coverage/
diff --git a/.govuk_dependabot_merger.yml b/.govuk_dependabot_merger.yml
index 8f574a4..b182701 100644
--- a/.govuk_dependabot_merger.yml
+++ b/.govuk_dependabot_merger.yml
@@ -1,10 +1,4 @@
-api_version: 1
-auto_merge:
-  - dependency: rubocop-govuk
-    allowed_semver_bumps:
-      - patch
-      - minor
-  - dependency: plek
-    allowed_semver_bumps:
-      - patch
-      - minor
+api_version: 2
+defaults:
+  auto_merge: true
+  update_external_dependencies: true
diff --git a/govuk_app_config.gemspec b/govuk_app_config.gemspec
index e39daf9..b3a0a35 100644
--- a/govuk_app_config.gemspec
+++ b/govuk_app_config.gemspec
@@ -40,5 +40,6 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "rspec", "~> 3.10"
   spec.add_development_dependency "rspec-its", "~> 1.3"
   spec.add_development_dependency "rubocop-govuk", "4.16.1"
+  spec.add_development_dependency "simplecov"
   spec.add_development_dependency "webmock"
 end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index d20b8f5..3bed01b 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -3,7 +3,9 @@
 require "byebug"
 require "climate_control"
 require "rspec/its"
+require "simplecov"
 require "webmock/rspec"
+SimpleCov.start
 
 RSpec.configure do |config|
   config.include(ActiveSupport::Testing::TimeHelpers)