diff --git a/Appraisals b/Appraisals
index 8dc04dbd6..b34a43f43 100644
--- a/Appraisals
+++ b/Appraisals
@@ -1,27 +1,20 @@
-appraise "rails-3.1" do
-  gem 'rails', '~> 3.1'
-  # Buggy sprockets can break tests under Ruby 2.0. Use a decent version.
-  # See https://github.com/sstephenson/sprockets/issues/352
-  gem 'sprockets', '>= 2.2.2'
-end
-
 appraise "rails-3.2" do
-  gem 'rails', '~> 3.2'
+  gem 'rails', '~> 3.2.21'
 end
 
 appraise "rails-4.0" do
-  gem 'rails', '~> 4.0'
+  gem 'rails', '~> 4.0.13'
 end
 
 appraise "rails-4.0-with-therubyracer" do
-  gem 'rails', '~> 4.0'
+  gem 'rails', '~> 4.0.13'
   gem 'therubyracer', '0.12.0', :platform => :mri
 end
 
 appraise "rails-4.1" do
-  gem 'rails', '~> 4.1'
+  gem 'rails', '~> 4.1.10'
 end
 
 appraise "rails-4.2" do
-  gem 'rails', '~> 4.2'
+  gem 'rails', '~> 4.2.1'
 end
diff --git a/README.md b/README.md
index d57b2adbe..56d284a04 100644
--- a/README.md
+++ b/README.md
@@ -8,7 +8,7 @@
 # react-rails
 
 
-`react-rails` makes it easy to use [React](http://facebook.github.io/react/) and [JSX](http://facebook.github.io/react/docs/jsx-in-depth.html) in your Ruby on Rails (3.1+) application. `react-rails` can:
+`react-rails` makes it easy to use [React](http://facebook.github.io/react/) and [JSX](http://facebook.github.io/react/docs/jsx-in-depth.html) in your Ruby on Rails (3.2+) application. `react-rails` can:
 
 - Provide [various `react` builds](#reactjs-builds) to your asset bundle
 - Transform [`.jsx` in the asset pipeline](#jsx)
diff --git a/gemfiles/rails_3.1.gemfile b/gemfiles/rails_3.1.gemfile
deleted file mode 100644
index c49049f55..000000000
--- a/gemfiles/rails_3.1.gemfile
+++ /dev/null
@@ -1,8 +0,0 @@
-# This file was generated by Appraisal
-
-source "http://rubygems.org"
-
-gem "rails", "~> 3.1"
-gem "sprockets", ">= 2.2.2"
-
-gemspec :path => "../"
diff --git a/gemfiles/rails_3.2.gemfile b/gemfiles/rails_3.2.gemfile
index 0b2047cf5..d9f2db1f8 100644
--- a/gemfiles/rails_3.2.gemfile
+++ b/gemfiles/rails_3.2.gemfile
@@ -2,6 +2,6 @@
 
 source "http://rubygems.org"
 
-gem "rails", "~> 3.2"
+gem "rails", "~> 3.2.21"
 
 gemspec :path => "../"
diff --git a/gemfiles/rails_4.0.gemfile b/gemfiles/rails_4.0.gemfile
index a3fdee2c0..8417b9d48 100644
--- a/gemfiles/rails_4.0.gemfile
+++ b/gemfiles/rails_4.0.gemfile
@@ -2,6 +2,6 @@
 
 source "http://rubygems.org"
 
-gem "rails", "~> 4.0"
+gem "rails", "~> 4.0.13"
 
 gemspec :path => "../"
diff --git a/gemfiles/rails_4.0_with_therubyracer.gemfile b/gemfiles/rails_4.0_with_therubyracer.gemfile
index a8f5be006..7a40d4bac 100644
--- a/gemfiles/rails_4.0_with_therubyracer.gemfile
+++ b/gemfiles/rails_4.0_with_therubyracer.gemfile
@@ -2,7 +2,7 @@
 
 source "http://rubygems.org"
 
-gem "rails", "~> 4.0"
+gem "rails", "~> 4.0.13"
 gem "therubyracer", "0.12.0", :platform => :mri
 
 gemspec :path => "../"
diff --git a/gemfiles/rails_4.1.gemfile b/gemfiles/rails_4.1.gemfile
index 1bb928d7b..8f55cb90e 100644
--- a/gemfiles/rails_4.1.gemfile
+++ b/gemfiles/rails_4.1.gemfile
@@ -2,6 +2,6 @@
 
 source "http://rubygems.org"
 
-gem "rails", "~> 4.1"
+gem "rails", "~> 4.1.10"
 
 gemspec :path => "../"
diff --git a/gemfiles/rails_4.2.gemfile b/gemfiles/rails_4.2.gemfile
index 23fe64d2b..2364ae718 100644
--- a/gemfiles/rails_4.2.gemfile
+++ b/gemfiles/rails_4.2.gemfile
@@ -2,6 +2,6 @@
 
 source "http://rubygems.org"
 
-gem "rails", "~> 4.2"
+gem "rails", "~> 4.2.1"
 
 gemspec :path => "../"
diff --git a/react-rails.gemspec b/react-rails.gemspec
index 0e98a5cf3..6ea18ede3 100644
--- a/react-rails.gemspec
+++ b/react-rails.gemspec
@@ -28,7 +28,7 @@ Gem::Specification.new do |s|
   s.add_dependency 'coffee-script-source', '~>1.8'
   s.add_dependency 'connection_pool'
   s.add_dependency 'execjs'
-  s.add_dependency 'rails', '>= 3.1'
+  s.add_dependency 'rails', '>= 3.2'
   s.add_dependency 'tilt'
 
   s.files = Dir[
diff --git a/test/dummy/config/initializers/secret_token.rb b/test/dummy/config/initializers/secret_token.rb
index bbb0cf04a..5dea6d691 100644
--- a/test/dummy/config/initializers/secret_token.rb
+++ b/test/dummy/config/initializers/secret_token.rb
@@ -11,5 +11,5 @@
 # if you're sharing your code publicly.
 Dummy::Application.config.secret_key_base = '43fa5672451bbd0a171668e625edc433eb00eeeb14c2606546e262e499ab853cfb532998d4809abe5019bf13888863e3a2c7d5cf7757de7a2b1fb50826d9874e'
 
-# for rails 3.1 & 3.2
+# For Rails 3.2.
 Dummy::Application.config.secret_token = Dummy::Application.config.secret_key_base