diff --git a/.travis.yml b/.travis.yml
index e84c255..45c7e68 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -12,7 +12,6 @@ rvm:
   - rbx-3
 
 gemfile:
-  - gemfiles/active_record_32.gemfile
   - gemfiles/active_record_40.gemfile
   - gemfiles/active_record_41.gemfile
   - gemfiles/active_record_42.gemfile
@@ -37,12 +36,6 @@ matrix:
       gemfile: gemfiles/active_record_edge.gemfile
     - rvm: 2.1.10
       gemfile: gemfiles/active_record_edge.gemfile
-    - rvm: 2.2.5
-      gemfile: gemfiles/active_record_32.gemfile
-    - rvm: 2.3.1
-      gemfile: gemfiles/active_record_32.gemfile
-    - rvm: ruby-head
-      gemfile: gemfiles/active_record_32.gemfile
     - rvm: ruby-head
       gemfile: gemfiles/active_record_40.gemfile
     - rvm: ruby-head
diff --git a/README.rdoc b/README.rdoc
index bdf4fc2..ca86d42 100644
--- a/README.rdoc
+++ b/README.rdoc
@@ -29,7 +29,7 @@ The pagination helper outputs the HTML5 <nav> tag by default. Plus, the helper s
 
 * Ruby 2.0.0, 2.1.x, 2.2.x, 2.3.x, 2.4
 
-* Rails 3.2, 4.0, 4.1, 4.2, 5.0, 5.1
+* Rails 4.0, 4.1, 4.2, 5.0, 5.1
 
 * Sinatra 1.4
 
diff --git a/Rakefile b/Rakefile
index 53e8822..ffce54a 100644
--- a/Rakefile
+++ b/Rakefile
@@ -19,7 +19,6 @@ namespace :spec do
     active_record_42
     active_record_41
     active_record_40
-    active_record_32
   )
 
   mappers.each do |gemfile|
diff --git a/gemfiles/active_record_32.gemfile b/gemfiles/active_record_32.gemfile
deleted file mode 100644
index 177cfc5..0000000
--- a/gemfiles/active_record_32.gemfile
+++ /dev/null
@@ -1,26 +0,0 @@
-source 'https://rubygems.org'
-
-gem 'railties', '~> 3.2.3'
-gem 'activerecord', '~> 3.2.3', :require => 'active_record'
-gem 'rspec-rails', '~> 2.14.1'
-gem 'test-unit'
-gem 'mime-types', '2.99' if RUBY_VERSION < '2.0.0'
-
-platforms :ruby do
-  if RUBY_VERSION > "2.1.0"
-    gem 'sqlite3'
-  else
-    gem 'sqlite3', '1.3.8'
-  end
-end
-platforms :jruby do
-  gem 'activerecord-jdbcsqlite3-adapter', '>= 1.3.0'
-end
-platforms :rbx do
-  gem 'rubysl', '~> 2.0'
-  gem 'racc'
-  gem 'rubysl-test-unit', github: 'rubysl/rubysl-test-unit', branch: '2.0'
-  gem 'rubinius-developer_tools'
-end
-
-gemspec :path => '../'
diff --git a/kaminari.gemspec b/kaminari.gemspec
index 70716f0..df3bf78 100644
--- a/kaminari.gemspec
+++ b/kaminari.gemspec
@@ -10,7 +10,7 @@ Gem::Specification.new do |s|
   s.email       = ['ronnie@dio.jp']
   s.homepage    = 'https://github.com/amatsuda/kaminari'
   s.summary     = 'A pagination engine plugin for Rails 3+ and other modern frameworks'
-  s.description = 'Kaminari is a Scope & Engine based, clean, powerful, agnostic, customizable and sophisticated paginator for Rails 3+'
+  s.description = 'Kaminari is a Scope & Engine based, clean, powerful, agnostic, customizable and sophisticated paginator for Rails 4+'
 
   s.files         = `git ls-files`.split("\n")
   s.test_files    = `git ls-files -- {test,spec,features}/*`.split("\n")
@@ -19,7 +19,7 @@ Gem::Specification.new do |s|
 
   s.licenses = ['MIT']
 
-  s.add_dependency 'activesupport', '>= 3.0.0'
+  s.add_dependency 'activesupport', '>= 4.0.0'
   s.add_dependency 'kaminari-actionview'
   s.add_dependency 'kaminari-activerecord'