diff --git a/.travis.yml b/.travis.yml
index 8f74b9f..24b2885 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,21 +1,25 @@
 language: ruby
 
 env:
-  - "RAILS_VERSION=3.2.0"
-  - "RAILS_VERSION=4.0.0"
-  - "RAILS_VERSION=4.1.1"
-  - "RAILS_VERSION=4.2.4"
+  - "RAILS_VERSION=3.2"
+  - "RAILS_VERSION=4.0"
+  - "RAILS_VERSION=4.1"
+  - "RAILS_VERSION=4.2"
   - "RAILS_VERSION=master"
 
 rvm:
-  - 1.9.3
   - 2.0
   - 2.1
-  - 2.2
+  - 2.2.2
 
 matrix:
   allow_failures:
     - env: "RAILS_VERSION=master"
+  exclude:
+    - rvm: 2.0
+      env: RAILS_VERSION=master
+    - rvm: 2.1
+      env: RAILS_VERSION=master
 
 before_install:
   - gem update bundler
diff --git a/README.md b/README.md
index 7a981b6..046cb9d 100644
--- a/README.md
+++ b/README.md
@@ -24,6 +24,8 @@ Once that's done, run:
 
     bundle install
 
+Note that Ruby 2.0 or greater is required.
+
 ### Installation
 
 #### Automatic initial setup