diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 0619af20..9db361ec 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -11,12 +11,13 @@ jobs:
     runs-on: ubuntu-latest
 
     strategy:
+      fail-fast: false
       matrix:
         ruby-version:
-          - "3.0"
           - "3.1"
           - "3.2"
           - "3.3"
+          - "3.4"
 
     steps:
     - uses: actions/checkout@v4
@@ -30,12 +31,20 @@ jobs:
 
   integration-specs:
     runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        ruby-version:
+          - "3.1"
+          - "3.2"
+          - "3.3"
+          - "3.4"
     steps:
     - uses: actions/checkout@v4
     - name: Set up Ruby
       uses: ruby/setup-ruby@v1
       with:
-        ruby-version: "3.0"
+        ruby-version: ${{ matrix.ruby-version }}
         bundler-cache: true
     - name: Bring up docker-compose stack
       run: docker compose up -d
diff --git a/CHANGELOG.md b/CHANGELOG.md
index b467229b..7b85d2da 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,9 @@
 
 ## Unreleased
 
+* Add tests against Ruby 3.4
+* Drop support for Ruby 3.0
+
 ## 2.11.0
 
 * Allow the liveness probe command to skip loading config files
diff --git a/Gemfile b/Gemfile
index 8797293a..05d6e270 100644
--- a/Gemfile
+++ b/Gemfile
@@ -5,6 +5,4 @@ source 'https://rubygems.org'
 # Specify your gem's dependencies in racecar.gemspec
 gemspec
 
-# We actually support version 7.x (see gemspec); this extra restriction is added just for running the test suite also
-# on Ruby 2.6, which activesupport 7.0 does not support.
-gem 'activesupport', '~> 6.1.0'
+gem 'activesupport', '~> 7.2.0'
diff --git a/Gemfile.lock b/Gemfile.lock
index 1b0e3fd3..398f3a28 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -8,24 +8,36 @@ PATH
 GEM
   remote: https://rubygems.org/
   specs:
-    activesupport (6.1.7.3)
-      concurrent-ruby (~> 1.0, >= 1.0.2)
+    activesupport (7.2.2.1)
+      base64
+      benchmark (>= 0.3)
+      bigdecimal
+      concurrent-ruby (~> 1.0, >= 1.3.1)
+      connection_pool (>= 2.2.5)
+      drb
       i18n (>= 1.6, < 2)
+      logger (>= 1.4.2)
       minitest (>= 5.1)
-      tzinfo (~> 2.0)
-      zeitwerk (~> 2.3)
+      securerandom (>= 0.3)
+      tzinfo (~> 2.0, >= 2.0.5)
+    base64 (0.2.0)
+    benchmark (0.4.0)
+    bigdecimal (3.1.9)
     byebug (11.1.3)
     coderay (1.1.3)
-    concurrent-ruby (1.2.2)
+    concurrent-ruby (1.3.4)
+    connection_pool (2.4.1)
     diff-lcs (1.5.0)
     dogstatsd-ruby (5.5.0)
+    drb (2.2.1)
     ffi (1.16.3)
     i18n (1.12.0)
       concurrent-ruby (~> 1.0)
     king_konf (1.0.1)
+    logger (1.6.4)
     method_source (1.0.0)
     mini_portile2 (2.8.5)
-    minitest (5.18.0)
+    minitest (5.25.4)
     pry (0.14.2)
       coderay (~> 1.1)
       method_source (~> 1.0)
@@ -50,16 +62,16 @@ GEM
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.12.0)
     rspec-support (3.12.0)
+    securerandom (0.4.1)
     timecop (0.9.6)
     tzinfo (2.0.6)
       concurrent-ruby (~> 1.0)
-    zeitwerk (2.6.7)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
-  activesupport (~> 6.1.0)
+  activesupport (~> 7.2.0)
   bundler (>= 1.13, < 3)
   dogstatsd-ruby (>= 4.0.0, < 6.0.0)
   pry-byebug
@@ -69,4 +81,4 @@ DEPENDENCIES
   timecop
 
 BUNDLED WITH
-   2.4.9
+   2.6.2
diff --git a/racecar.gemspec b/racecar.gemspec
index ea26af12..a7933541 100644
--- a/racecar.gemspec
+++ b/racecar.gemspec
@@ -20,7 +20,7 @@ Gem::Specification.new do |spec|
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ["lib"]
 
-  spec.required_ruby_version = '>= 3.0'
+  spec.required_ruby_version = '>= 3.1'
 
   spec.add_runtime_dependency "king_konf", "~> 1.0.0"
   spec.add_runtime_dependency "rdkafka",   "~> 0.15.0"
diff --git a/spec/support/integration_helper.rb b/spec/support/integration_helper.rb
index ec2dc208..a4092f41 100644
--- a/spec/support/integration_helper.rb
+++ b/spec/support/integration_helper.rb
@@ -1,6 +1,7 @@
 # frozen_string_literal: true
 
 require "securerandom"
+require "active_support/isolated_execution_state"
 
 module IntegrationHelper
   def self.included(klass)