diff --git a/.github/workflows/ruby.yml b/.github/workflows/ruby.yml
index fa70970..1641af8 100644
--- a/.github/workflows/ruby.yml
+++ b/.github/workflows/ruby.yml
@@ -32,13 +32,12 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby-version: ['3.1', '3.2', '3.3', '3.4']
+        ruby-version: ['3.2', '3.3', '3.4']
         test: ['minitest', 'rspec']
         gemfile:
-          - Gemfile.rails70
-          - Gemfile.rails71
           - Gemfile.rails72
           - Gemfile.rails80
+          - Gemfile.rails81
           - Gemfile.railsmaster
           - Gemfile.mongo_mapper
         db:
@@ -48,11 +47,7 @@ jobs:
         exclude:
           - gemfile: Gemfile.mongo_mapper
             db: postgresql
-          - ruby-version: '3.1'
-            gemfile: Gemfile.mongo_mapper
-          - ruby-version: '3.1'
-            gemfile: Gemfile.rails80
-          - ruby-version: '3.1'
+          - ruby-version: '3.2'
             gemfile: Gemfile.railsmaster
     env:
       BUNDLE_GEMFILE: "${{ matrix.gemfile }}"
diff --git a/Gemfile.rails70 b/Gemfile.rails70
deleted file mode 100644
index 93f6029..0000000
--- a/Gemfile.rails70
+++ /dev/null
@@ -1,10 +0,0 @@
-eval_gemfile('Gemfile.global')
-
-gem 'minitest', '~> 5.8'
-gem 'rails',    github: 'rails/rails', branch: '7-0-stable', require: false
-
-gem 'mongoid',  github: 'mongodb/mongoid'
-
-# This Rails version has a pessimistic version constraint on sqlite3:
-# https://github.com/rails/rails/blob/7-0-stable/Gemfile#L148
-gem 'sqlite3', '~> 1.6', '>= 1.6.6', platforms: [:ruby, :mswin, :mingw]
diff --git a/Gemfile.rails71 b/Gemfile.rails81
similarity index 71%
rename from Gemfile.rails71
rename to Gemfile.rails81
index 448f83d..0e946ee 100644
--- a/Gemfile.rails71
+++ b/Gemfile.rails81
@@ -1,7 +1,7 @@
 eval_gemfile('Gemfile.global')
 
 gem 'minitest', '~> 5.8'
-gem 'rails',    github: 'rails/rails', branch: '7-1-stable', require: false
+gem 'rails',    github: 'rails/rails', branch: '8-1-stable', require: false
 
 gem 'mongoid',  github: 'mongodb/mongoid'
 
diff --git a/enumerize.gemspec b/enumerize.gemspec
index 5c1a977..6da4aee 100644
--- a/enumerize.gemspec
+++ b/enumerize.gemspec
@@ -22,7 +22,7 @@ Gem::Specification.new do |gem|
     "bug_tracker_uri"   => "https://github.com/brainspec/enumerize/issues",
     "wiki_uri"          => "https://github.com/brainspec/enumerize/wiki"
   }
-  gem.required_ruby_version = '>= 2.7'
+  gem.required_ruby_version = '>= 3.2'
 
   gem.add_dependency('activesupport', '>= 3.2')
 end