diff --git a/.github/workflows/nightly-unit-tests.yaml b/.github/workflows/nightly-unit-tests.yaml
index 002c4a35..25d40456 100644
--- a/.github/workflows/nightly-unit-tests.yaml
+++ b/.github/workflows/nightly-unit-tests.yaml
@@ -11,6 +11,7 @@ jobs:
       max-parallel: 4
       matrix:
         # Run acceptance tests all supported combinations of Ruby and ActiveRecord.
+        ruby: ["3.1", "3.2", "3.3"]
         ar: ["~> 6.1.0", "~> 7.0.0", "~> 7.1.0", "~> 7.2.0", "~> 8.0.0"]
         # Exclude combinations that are not supported.
         exclude:
diff --git a/Gemfile b/Gemfile
index 607c61ac..d2adedf6 100644
--- a/Gemfile
+++ b/Gemfile
@@ -3,7 +3,7 @@ source "https://rubygems.org"
 # Specify your gem's dependencies in activerecord-spanner.gemspec
 gemspec
 
-ar_version = ENV.fetch("AR_VERSION", "~> 7.1.0")
+ar_version = ENV.fetch("AR_VERSION", "~> 7.2.0")
 gem "activerecord", ar_version
 gem "ostruct"
 gem "minitest", "~> 5.25.0"
@@ -17,6 +17,7 @@ gem 'sqlite3'
 install_if -> { ar_version.dup.to_s.sub("~>", "").strip < "7.1.0" && !ENV["SKIP_COMPOSITE_PK"] } do
   gem "composite_primary_keys"
 end
+gem 'simplecov', require: false, group: :test
 
 # Required for samples
 gem "docker-api"
diff --git a/acceptance/test_helper.rb b/acceptance/test_helper.rb
index de45dbbd..a0c2cae4 100644
--- a/acceptance/test_helper.rb
+++ b/acceptance/test_helper.rb
@@ -4,6 +4,14 @@
 # license that can be found in the LICENSE file or at
 # https://opensource.org/licenses/MIT.
 
+require 'simplecov'
+SimpleCov.start do
+  add_filter '/test/'
+  add_filter '/acceptance/'
+  add_filter '/benchmarks/'
+end
+
+# Previous content of test helper now starts here
 gem "minitest"
 require "minitest/autorun"
 require "minitest/focus"
diff --git a/test/test_helper.rb b/test/test_helper.rb
index 965b1106..913111d3 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -4,6 +4,13 @@
 # license that can be found in the LICENSE file or at
 # https://opensource.org/licenses/MIT.
 
+require 'simplecov'
+SimpleCov.start do
+  add_filter '/test/'
+  add_filter '/acceptance/'
+  add_filter '/benchmarks/'
+end
+
 require "minitest/autorun"
 require "minitest/focus"
 require "minitest/rg"