diff --git a/Gemfile b/Gemfile
index 303e6b6b..f43276a6 100644
--- a/Gemfile
+++ b/Gemfile
@@ -120,8 +120,7 @@ group :test do
   gem 'rspec-retry'
   gem 'selenium-webdriver'
   gem 'shoulda-matchers', '~> 8.0'
-  gem 'simplecov', '~> 0.22.0', require: false
-  gem 'simplecov_json_formatter'
+  gem 'simplecov', '~> 1.0.1', require: false
   gem 'timecop'
   gem 'webmock'
 end
diff --git a/Gemfile.lock b/Gemfile.lock
index 29f2523a..7b1191c5 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -174,7 +174,6 @@ GEM
       irb (~> 1.10)
       reline (>= 0.3.8)
     diff-lcs (1.6.2)
-    docile (1.4.1)
     domain_name (0.6.20240107)
     dotenv (3.2.0)
     dotenv-rails (3.2.0)
@@ -539,12 +538,7 @@ GEM
     shellany (0.0.1)
     shoulda-matchers (8.0.1)
       activesupport (>= 7.2)
-    simplecov (0.22.0)
-      docile (~> 1.1)
-      simplecov-html (~> 0.11)
-      simplecov_json_formatter (~> 0.1)
-    simplecov-html (0.13.2)
-    simplecov_json_formatter (0.1.4)
+    simplecov (1.0.1)
     simpleidn (0.2.3)
     snaky_hash (2.0.3)
       hashie (>= 0.1.0, < 6)
@@ -663,8 +657,7 @@ DEPENDENCIES
   sentry-rails
   sentry-ruby
   shoulda-matchers (~> 8.0)
-  simplecov (~> 0.22.0)
-  simplecov_json_formatter
+  simplecov (~> 1.0.1)
   sprockets-rails
   stimulus-rails
   strong_migrations
diff --git a/config/simplecov.rb b/config/simplecov.rb
new file mode 100644
index 00000000..9272e8fc
--- /dev/null
+++ b/config/simplecov.rb
@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+
+# Shared SimpleCov configuration used by both test suites so their coverage
+# setup never drifts:
+#   * RSpec    -> required from spec/spec_helper.rb
+#   * Cucumber -> required from features/support/env.rb
+#
+# This must be required before any application code loads so SimpleCov can hook
+# into Coverage. As of SimpleCov 1.0 the JSON formatter is bundled with the gem
+# (the standalone simplecov_json_formatter gem is no longer needed), and calling
+# SimpleCov.start more than once in a process is a no-op rather than an error.
+require 'simplecov'
+
+SimpleCov.start 'rails' do
+  formatter SimpleCov::Formatter::MultiFormatter.new(
+    [
+      SimpleCov::Formatter::HTMLFormatter,
+      SimpleCov::Formatter::JSONFormatter
+    ]
+  )
+end
diff --git a/features/support/env.rb b/features/support/env.rb
index d15cf509..c6b820b4 100644
--- a/features/support/env.rb
+++ b/features/support/env.rb
@@ -3,20 +3,9 @@
 
 # Database Cleaner configuration is loaded in features/support/database_cleaner.rb
 
-# Configure SimpleCov before requiring other files
-require 'simplecov'
-require 'simplecov_json_formatter'
-
-# Only start SimpleCov if it hasn't been started
-unless SimpleCov.running
-  SimpleCov.start 'rails' do
-    track_files 'app/**/*.rb'
-    formatter SimpleCov::Formatter::MultiFormatter.new([
-                                                         SimpleCov::Formatter::HTMLFormatter,
-                                                         SimpleCov::Formatter::JSONFormatter
-                                                       ])
-  end
-end
+# Start SimpleCov coverage reporting before requiring any application code.
+# The configuration is shared with the RSpec suite (see config/simplecov.rb).
+require_relative '../../config/simplecov'
 
 require 'cucumber/rails'
 require 'rspec/mocks'
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 21fc7fed..2e403a42 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -17,17 +17,10 @@
 # See https://rubydoc.info/gems/rspec-core/RSpec/Core/Configuration
 
 # require 'codeclimate-test-reporter'
-require 'simplecov'
-require 'simplecov_json_formatter'
-SimpleCov.formatter = SimpleCov::Formatter::MultiFormatter.new([
-                                                                 SimpleCov::Formatter::HTMLFormatter,
-                                                                 SimpleCov::Formatter::JSONFormatter
-                                                               ])
-
-SimpleCov.start 'rails' do
-  # add_filter '/app/controllers/api'
-  # add_filter '/app/controllers/bcourses_controller.rb'
-end
+# Shared SimpleCov configuration (see config/simplecov.rb) so the RSpec and
+# Cucumber suites stay in sync. Add project-wide coverage filters there, e.g.:
+#   skip '/app/controllers/api'
+require_relative '../config/simplecov'
 
 # load libraries from lib
 $LOAD_PATH.unshift(File.expand_path('../lib', __dir__))