diff --git a/.travis.yml b/.travis.yml
index 368278f..69a8f8f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,3 +2,8 @@ rvm:
   - 1.9.2
   - 1.9.3
   - 2.0.0
+  - 2.1
+  - 2.2
+  - 2.3
+  - 2.4
+  - 2.5
diff --git a/Gemfile b/Gemfile
index e25372a..d226e6b 100644
--- a/Gemfile
+++ b/Gemfile
@@ -3,5 +3,6 @@ source "https://rubygems.org"
 gemspec
 
 gem "coveralls", "~> 0.6", require: false
-gem "rake", ">= 0.8.7"
+# Rake 11.0.1 removes the last_comment method which Rails 2.3 rspec-core (< 3.4.4)
+gem "rake", ">= 0.8.7", "< 11.0"
 gem "rspec", "~> 2.4"