diff --git a/.travis.yml b/.travis.yml
index b100a600..157e917a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,9 +2,9 @@ language: ruby
 env:
   global:
     - RUBY_GC_MALLOC_LIMIT=90000000
-    - RUBY_GC_HEAP_FREE_SLOTS=200000
+    - RUBY_FREE_MIN=200000
 rvm:
-  - 2.1.0
+  - 2.0.0
 addons:
   postgresql: 9.3
 before_script:
diff --git a/Gemfile b/Gemfile
index 4a51ca28..58bc4852 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,4 +1,4 @@
-ruby '2.1.0'
+ruby '2.0.0'
 
 source 'https://rubygems.org'
 gemspec