diff --git a/.travis.yml b/.travis.yml
index 1d462076..e4be3a4f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,16 +3,14 @@ language:
 
 rvm:
   - '2.0'
-  - '2.1'
-  - '2.2'
+  - '2.1.10'
+  - '2.2.5'
   - '2.3.0'
 
 matrix:
   fast_finish:
     true
 
-install: true
-
 before_install:
   - sudo apt-get update -qq
   - sudo apt-get install ruby gcc ruby-dev rake make -y
@@ -20,3 +18,4 @@ before_install:
 script:
   - gem build numo-narray.gemspec
   - gem install numo-narray-0.9.0.1.gem
+  - rspec spec
diff --git a/spec/bit_spec.rb b/spec/bit_spec.rb
index bc368635..4319d61c 100644
--- a/spec/bit_spec.rb
+++ b/spec/bit_spec.rb
@@ -1,4 +1,4 @@
-require File.join(File.dirname(__FILE__), "../ext/numo/narray/narray")
+require "numo/narray"
 #Numo::NArray.debug = true
 
 RSpec.configure do |config|
diff --git a/spec/narray_spec.rb b/spec/narray_spec.rb
index 93e70480..9e63174a 100644
--- a/spec/narray_spec.rb
+++ b/spec/narray_spec.rb
@@ -1,4 +1,4 @@
-require File.join(File.dirname(__FILE__), "../ext/numo/narray/narray")
+require "numo/narray"
 #Numo::NArray.debug = true
 
 RSpec.configure do |config|