diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index cfee892..772f701 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -14,15 +14,9 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: ['3.2', '3.3', '3.4']
-        rails: ['7.1.0', '7.2.0', '8.0.0', '8.1.0']
+        ruby: ['3.3', '3.4', '4.0']
+        rails: ['8.0.0', '8.1.0']
         activeadmin: ['3.2.0', '3.5.0']
-        exclude:
-          # Active Admin 3.2 predates Rails 8 support.
-          - rails: '8.0.0'
-            activeadmin: '3.2.0'
-          - rails: '8.1.0'
-            activeadmin: '3.2.0'
     env:
       RAILS: ${{ matrix.rails }}
       AA: ${{ matrix.activeadmin }}
diff --git a/Gemfile b/Gemfile
index 0955c81..d2ed288 100644
--- a/Gemfile
+++ b/Gemfile
@@ -3,7 +3,7 @@ source 'https://rubygems.org'
 # Specify your gem's dependencies in active_admin_date_range_preset.gemspec
 gemspec
 
-default_rails_version = '7.1.0'
+default_rails_version = '8.0.0'
 default_activeadmin_version = '3.5.0'
 
 gem 'rails', "~> #{ENV['RAILS'] || default_rails_version}"
diff --git a/README.md b/README.md
index dc2959d..8f0b7c8 100644
--- a/README.md
+++ b/README.md
@@ -19,9 +19,13 @@ This is how it looks like
 
 ## Compatibility
 
-Active Admin 3.2 or newer, in the 3.x series. Rails 7.1 or newer, Ruby 3.2 or
-newer. CI covers Active Admin 3.2 and 3.5 against the Rails versions in the
-matrix.
+Active Admin 3.2 or newer, in the 3.x series. Rails 8.0 or newer, Ruby 3.3 or
+newer. CI covers Active Admin 3.2 and 3.5 on Ruby 3.3, 3.4 and 4.0 against
+Rails 8.0 and 8.1 — every Rails series still supported upstream.
+
+Version 0.4.0 raised the Rails floor from 7.1 to 8.0. Every 7.x series is out
+of support — 7.1 since October 2025, 7.2 since August 2026 — and none of them
+is tested. Stay on 0.3.x if you are still on Rails 7.
 
 The Rails and Ruby floors are declared explicitly because Active Admin 3.2
 still allows `railties >= 6.1` and Ruby `>= 2.6`, both long past end of life
diff --git a/active_admin_date_range_preset.gemspec b/active_admin_date_range_preset.gemspec
index 689cb4a..9dada67 100644
--- a/active_admin_date_range_preset.gemspec
+++ b/active_admin_date_range_preset.gemspec
@@ -32,10 +32,11 @@ Gem::Specification.new do |spec|
   spec.add_dependency "activeadmin", "~> 3.2"
 
   # Active Admin 3.2 itself still allows railties >= 6.1 and Ruby >= 2.6,
-  # both of which reached end of life years ago and neither of which is
-  # tested here. Without these the gem would inherit that claim by silence.
-  spec.add_dependency "railties", ">= 7.1"
-  spec.required_ruby_version = ">= 3.2"
+  # both of which reached end of life years ago. Declare what CI covers, so
+  # the gem does not inherit that claim by silence. Every Rails 7.x series is
+  # out of support: 7.1 since October 2025, 7.2 since August 2026.
+  spec.add_dependency "railties", ">= 8.0"
+  spec.required_ruby_version = ">= 3.3"
 
   spec.add_development_dependency "rake"
 end
diff --git a/lib/active_admin_date_range_preset/version.rb b/lib/active_admin_date_range_preset/version.rb
index 2a65ec9..1c60b15 100644
--- a/lib/active_admin_date_range_preset/version.rb
+++ b/lib/active_admin_date_range_preset/version.rb
@@ -1,3 +1,3 @@
 module ActiveAdminDateRangePreset
-  VERSION = "0.3.1"
+  VERSION = "0.4.0"
 end
diff --git a/package.json b/package.json
index 4481cbd..7124a6e 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@activeadmin-plugins/active_admin_date_range_preset",
-  "version": "0.3.1",
+  "version": "0.4.0",
   "description": "Integrate useful fast links to set date ranges in to ActiveAdmin, for example today range, week range, month range",
   "main": "src/active_admin_date_range_preset.js",
   "style": "src/active_admin_date_range_preset.scss",