diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 2ed1388c..151889ec 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -13,15 +13,15 @@ jobs:
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: '3.0'
+          ruby-version: '3.3'
           bundler-cache: true
       - name: Rubocop
         run: bundle exec rubocop
   build:
     strategy:
       matrix:
-        ruby: [ 'jruby-9.2', '2.5', '3.1' ]
-        python: [ '3.6', '3.11' ]
+        ruby: [ 'jruby-9.3', 'jruby-9.4', '2.6', '3.3' ]
+        python: [ '3.6', '3.112' ]
         platform: [ ubuntu-20.04, macos-latest, windows-2019 ]
     runs-on: ${{ matrix.platform }}
     steps:
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index cfa8799f..83418237 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -10,12 +10,12 @@ jobs:
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: '3.1'
+          ruby-version: '3.3'
           bundler-cache: true
       - name: Setup Python
         uses: actions/setup-python@v5
         with:
-          python-version: '3.11'
+          python-version: '3.12'
       - name: Build
         run: bundle exec rake build
       - name: Publish to RubyGems.org
diff --git a/CHANGELOG.adoc b/CHANGELOG.adoc
index c26bb3c8..e5169bf6 100644
--- a/CHANGELOG.adoc
+++ b/CHANGELOG.adoc
@@ -5,7 +5,11 @@
 This document provides a high-level view of the changes to the {project-name} by release.
 For a detailed view of what has changed, refer to the {uri-repo}/commits/master[commit history] on GitHub.
 
-== 2.4.1
+== Unreleased
+
+* Drop support for Ruby 2.5
+
+== 2.4.1 (2023-11-13) - @slonopotamus
 
 * Fix handling of Python virtual environments on Windows ({uri-repo})/issues/256[#256])
 
diff --git a/README.adoc b/README.adoc
index 28098838..f71e25eb 100644
--- a/README.adoc
+++ b/README.adoc
@@ -23,7 +23,7 @@ If a Python process dies, a new one will be spawned on the next pygments.rb requ
 == System Requirements
 
 - Python >= 3.6
-- Ruby >= 2.5
+- Ruby >= 2.6
 
 == Installation