diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index a7623a8..7704685 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -40,18 +40,22 @@ jobs:
       fail-fast: false
       matrix:
         ruby:
+          - '3.3'
           - '3.2'
           - '3.1'
           - '3.0'
-          - '2.7'
         rails:
           - activerecord_7.1
           - activerecord_7.0
           - activerecord_6.1
+          - activerecord_edge
         adapter:
           - 'sqlite3:///:memory:'
           - mysql2://root:root@0/closure_tree_test
           - postgres://closure_tree:closure_tree@0/closure_tree_test
+        exclude:
+          - ruby: '3.0'
+            rails: activerecord_edge
 
     steps:
       - name: Checkout
diff --git a/.github/workflows/ci_jruby.yml b/.github/workflows/ci_jruby.yml
index 4e032a1..e48d00d 100644
--- a/.github/workflows/ci_jruby.yml
+++ b/.github/workflows/ci_jruby.yml
@@ -9,7 +9,7 @@ on:
     branches:
       - master
 concurrency:
-  group: ci-${{ github.head_ref }}
+  group: ci-${{ github.head_ref }}-jruby
   cancel-in-progress: true
 
 jobs:
diff --git a/.github/workflows/ci_truffleruby.yml b/.github/workflows/ci_truffleruby.yml
index 62ba4f1..c85e06a 100644
--- a/.github/workflows/ci_truffleruby.yml
+++ b/.github/workflows/ci_truffleruby.yml
@@ -9,7 +9,7 @@ on:
     branches:
       - master
 concurrency:
-  group: ci-${{ github.head_ref }}
+  group: ci-${{ github.head_ref }}-truffleruby
   cancel-in-progress: true
 
 jobs:
diff --git a/closure_tree.gemspec b/closure_tree.gemspec
index edb32f5..83bab80 100644
--- a/closure_tree.gemspec
+++ b/closure_tree.gemspec
@@ -18,7 +18,7 @@ Gem::Specification.new do |gem|
   end
 
   gem.test_files  = gem.files.grep(%r{^spec/})
-  gem.required_ruby_version = '>= 2.7.7'
+  gem.required_ruby_version = '>= 3.0.0'
 
   gem.add_runtime_dependency 'activerecord', '>= 6.1.0'
   gem.add_runtime_dependency 'with_advisory_lock', '>= 4.0.0'