diff --git a/.travis.yml b/.travis.yml
index e5d92b9..2af8ec1 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,7 +4,6 @@ before_install:
   - gem install bundler
 
 rvm:
-  - 1.9.3
   - 2.0.0
   - 2.1.8
   - 2.2.4
diff --git a/README.md b/README.md
index a6b8ef7..9c2b6d9 100644
--- a/README.md
+++ b/README.md
@@ -4,6 +4,8 @@ The easiest way to install Intercom in a rails app.
 
 For interacting with the Intercom REST API, use the `intercom` gem (https://github.com/intercom/intercom-ruby)
 
+Requires ruby 2.0 or higher for `intercom-rails  >= 4.0`
+
 ## Installation
 Add this to your Gemfile:
 
diff --git a/circle.yml b/circle.yml
index b708b92..bac1db3 100644
--- a/circle.yml
+++ b/circle.yml
@@ -1,3 +1,6 @@
 dependencies:
   pre:
     - gem install bundler --pre
+machine:
+  ruby:
+    version: 2.0.0