diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index 81c7841..521af05 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -15,7 +15,7 @@ jobs:
     - name: Set up Ruby
       uses: ruby/setup-ruby@v1
       with:
-        ruby-version: 3.0
+        ruby-version: 3.3
     - name: Install dependencies
       run: bundle install
     - name: Run RuboCop against BASE..HEAD changes
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 275b203..f98f3ba 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -15,25 +15,17 @@ jobs:
       fail-fast: false
       matrix:
         ruby-version:
-          - '3.0'
           - '3.1'
           - '3.2'
           - '3.3'
         gemfile:
-          - gemfiles/Gemfile.rails61
           - gemfiles/Gemfile.rails70
           - gemfiles/Gemfile.rails71
           - gemfiles/Gemfile.rails72
           - gemfiles/Gemfile.rails80
         exclude:
-          # rails 7.2 requires ruby >= 3.1
-          # https://www.fastruby.io/blog/ruby/rails/versions/compatibility-table.html
-          - ruby-version: '3.0'
-            gemfile: 'gemfiles/Gemfile.rails72'
           # rails 8.0 requires ruby >= 3.2
           # https://www.fastruby.io/blog/ruby/rails/versions/compatibility-table.html
-          - ruby-version: '3.0'
-            gemfile: 'gemfiles/Gemfile.rails80'
           - ruby-version: '3.1'
             gemfile: 'gemfiles/Gemfile.rails80'
 
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 07af2ea..9b85b2e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,6 @@
 ## [Unreleased]
-*no unreleased changes*
+### Fixed
+* Drop support for Ruby 3.0, Rails 6.1
 
 ### Added
 ## 11.4.0 / 2025-10-10
diff --git a/gemfiles/Gemfile.rails61 b/gemfiles/Gemfile.rails61
deleted file mode 100644
index 9892137..0000000
--- a/gemfiles/Gemfile.rails61
+++ /dev/null
@@ -1,8 +0,0 @@
-source 'https://rubygems.org'
-
-gemspec path: '..'
-
-gem 'activesupport', '~> 6.1.0'
-
-# Latest concurrent-ruby breaks Rails < 7.1. See https://github.com/rails/rails/issues/54260
-gem 'concurrent-ruby', '1.3.4'