diff --git a/.travis.yml b/.travis.yml
index 82cf996..8ea176f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,33 +5,12 @@ before_install:
   - gem update --system
 
 rvm:
-  - 2.2
-  - 2.3
-  - 2.4
   - 2.5
   - 2.6
 
 env:
-  - RAILS_VERSION=4.2
-  - RAILS_VERSION=5.0
   - RAILS_VERSION=5.1
   - RAILS_VERSION=5.2
-
-matrix:
-  exclude:
-    - rvm: 2.2
-      env: RAILS_VERSION=5.0
-    - rvm: 2.2
-      env: RAILS_VERSION=5.1
-    - rvm: 2.2
-      env: RAILS_VERSION=5.2
-    - rvm: 2.5
-      env: RAILS_VERSION=4.2
-    - rvm: 2.5
-      env: RAILS_VERSION=5.0
-    - rvm: 2.6
-      env: RAILS_VERSION=4.2
-    - rvm: 2.6
-      env: RAILS_VERSION=5.0
+  - RAILS_VERSION=6.0
 
 sudo: false
diff --git a/Gemfile b/Gemfile
index 45fa91c..18475e4 100644
--- a/Gemfile
+++ b/Gemfile
@@ -5,6 +5,6 @@ source "http://rubygems.org"
 # development dependencies will be added by default to the :development group.
 gemspec
 
-version = ENV['RAILS_VERSION'] || "4.0"
+version = ENV['RAILS_VERSION'] || "6.0"
 
 eval_gemfile File.expand_path("../gemfiles/#{version}.gemfile", __FILE__)
diff --git a/gemfiles/4.2.gemfile b/gemfiles/6.0.gemfile
similarity index 72%
rename from gemfiles/4.2.gemfile
rename to gemfiles/6.0.gemfile
index 9c5192a..8420e22 100644
--- a/gemfiles/4.2.gemfile
+++ b/gemfiles/6.0.gemfile
@@ -2,11 +2,11 @@ gem 'puma'
 gem 'jquery-rails'
 gem 'jquery-ui-rails'
 gem 'ancestry'
-gem 'sqlite3', '~> 1.3.6'
+gem 'sqlite3'
 
 gem 'activeadmin'
 gem 'devise'
-gem 'rails', '~> 4.2.0'
+gem 'rails', '~> 6.0.0'
 gem 'sass-rails'
 
 # vim: ft=ruby