diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 8602d98..def3940 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -15,7 +15,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: ruby/setup-ruby@v1
         with:
-          ruby-version: "3.1"
+          ruby-version: "3.2"
           bundler-cache: true
       - run: bundle exec standardrb --parallel --format github
   test:
@@ -23,12 +23,18 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: [3.1, 3.2, head, debug, jruby-head, truffleruby-head]
-    continue-on-error: ${{ endsWith(matrix.ruby, 'head') || matrix.ruby == 'debug' }}
+        ruby: ["3.2", "3.3", "3.4", "4.0", head]
+        gemfile: [rails-7.2, rails-8.0, rails-8.1]
+        include:
+          - { ruby: jruby-10.0, gemfile: rails-8.0 }
+          - { ruby: jruby-10.0, gemfile: rails-8.1 }
+    continue-on-error: ${{ endsWith(matrix.ruby, 'head') }}
     steps:
       - uses: actions/checkout@v4
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.ruby }}
-      - run: bundle install
-      - run: bundle exec rspec
+          bundler-cache: true
+      - run: bundle exec appraisal generate
+      - run: bundle exec appraisal ${{ matrix.gemfile }} bundle install
+      - run: bundle exec appraisal ${{ matrix.gemfile }} rspec
diff --git a/.gitignore b/.gitignore
index e087fe0..fb9677d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,6 @@
 /Gemfile.lock
+gemfiles/*.gemfile
+gemfiles/*.gemfile.lock
 /.DS_Store
 /.bundle/
 /.ruby-*
diff --git a/Appraisals b/Appraisals
new file mode 100644
index 0000000..e3b0920
--- /dev/null
+++ b/Appraisals
@@ -0,0 +1,16 @@
+# frozen_string_literal: true
+
+appraise "rails-7.2" do
+  gem "activemodel", "~> 7.2.0"
+  gem "activesupport", "~> 7.2.0"
+end
+
+appraise "rails-8.0" do
+  gem "activemodel", "~> 8.0.0"
+  gem "activesupport", "~> 8.0.0"
+end
+
+appraise "rails-8.1" do
+  gem "activemodel", "~> 8.1.0"
+  gem "activesupport", "~> 8.1.0"
+end
diff --git a/CHANGELOG.md b/CHANGELOG.md
index dbabdc8..e7c9251 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,8 +8,14 @@ since Active Remote depends on specific Rails versions.
 
 ## [Unreleased]
 
+### Added
+
+- Support ActiveModel/ActiveSupport 8.0 and 8.1 (now allows `>= 7.2, < 8.2`)
+- Test against Rails 7.2, 8.0, and 8.1 via Appraisal, including a JRuby 10.0 leg for the 8.x line
+
 ### Changed
 
+- Require Ruby 3.2 (to match Rails 8)
 - Fix Standard violations
 
 ## [7.2.0] – 2026-02-13
diff --git a/Gemfile b/Gemfile
index 02a4f2b..29d8a17 100644
--- a/Gemfile
+++ b/Gemfile
@@ -3,6 +3,8 @@ source "https://rubygems.org"
 # Specify your gem's dependencies in active_remote.gemspec
 gemspec
 
+gem "appraisal"
+
 gem "benchmark-ips"
 
 gem "protobuf-rspec", ">= 1.1.2"
diff --git a/active_remote.gemspec b/active_remote.gemspec
index 8344085..6b80620 100644
--- a/active_remote.gemspec
+++ b/active_remote.gemspec
@@ -12,7 +12,7 @@ Gem::Specification.new do |spec|
   spec.description = "Active Remote provides Active Record-like object-relational mapping over RPC. It was written for use with Google Protocol Buffers, but could be extended to use any RPC data format."
   spec.homepage = "https://github.com/liveh2o/active_remote"
   spec.license = "MIT"
-  spec.required_ruby_version = ">= 3.1.0"
+  spec.required_ruby_version = ">= 3.2.0"
 
   spec.metadata["homepage_uri"] = spec.homepage
   spec.metadata["source_code_uri"] = spec.homepage
@@ -34,7 +34,7 @@ Gem::Specification.new do |spec|
   ##
   # Dependencies
   #
-  spec.add_dependency "activemodel", "~> 7.2.0"
-  spec.add_dependency "activesupport", "~> 7.2.0"
+  spec.add_dependency "activemodel", ">= 7.2", "< 8.2"
+  spec.add_dependency "activesupport", ">= 7.2", "< 8.2"
   spec.add_dependency "protobuf", ">= 3.0"
 end
diff --git a/spec/lib/active_remote/association_spec.rb b/spec/lib/active_remote/association_spec.rb
index e092f49..6d7b3a2 100644
--- a/spec/lib/active_remote/association_spec.rb
+++ b/spec/lib/active_remote/association_spec.rb
@@ -48,7 +48,7 @@
         end
 
         context "when user_guid doesnt exist on model " do
-          before { allow(subject.class).to receive_message_chain(:public_instance_methods, :include?).with(:user_guid).and_return(false) }
+          before { allow(subject.class).to receive(:public_method_defined?).with(:user_guid).and_return(false) }
 
           it "raises an error" do
             expect { subject.user }.to raise_error(::RuntimeError, /Could not find attribute/)
@@ -56,7 +56,7 @@
         end
 
         context "when user_guid doesnt exist on associated model " do
-          before { allow(Author).to receive_message_chain(:public_instance_methods, :include?).with(:user_guid).and_return(false) }
+          before { allow(Author).to receive(:public_method_defined?).with(:user_guid).and_return(false) }
 
           it "raises an error" do
             expect { subject.user }.to raise_error(::RuntimeError, /Could not find attribute/)
@@ -158,7 +158,7 @@
       end
 
       context "when user_guid doesnt exist on associated model " do
-        before { allow(Post).to receive_message_chain(:public_instance_methods, :include?).with(:user_guid).and_return(false) }
+        before { allow(Post).to receive(:public_method_defined?).with(:user_guid).and_return(false) }
 
         it "raises an error" do
           expect { subject.user_posts }.to raise_error(::RuntimeError, /Could not find attribute/)
@@ -246,7 +246,7 @@
       end
 
       context "when user_guid doesnt exist on associated model " do
-        before { allow(Author).to receive_message_chain(:public_instance_methods, :include?).with(:user_guid).and_return(false) }
+        before { allow(Author).to receive(:public_method_defined?).with(:user_guid).and_return(false) }
 
         it "raises an error" do
           expect { subject.chief_editor }.to raise_error(::RuntimeError, /Could not find attribute/)