diff --git a/naver_map.gemspec b/naver_map.gemspec
index 77aa2b9..5e9d8f3 100644
--- a/naver_map.gemspec
+++ b/naver_map.gemspec
@@ -35,6 +35,7 @@ Gem::Specification.new do |spec|
   spec.add_dependency "rest-client", "~> 2.0", ">= 2.0.0"
 
   spec.add_development_dependency "bundler", "~> 1.13"
+  spec.add_development_dependency "dotenv", "~> 2.1.1"
   spec.add_development_dependency "minitest", "~> 5.8", ">= 5.8.3"
   spec.add_development_dependency "rake", "~> 11.2", ">= 11.2.2"
 end
diff --git a/test/naver_map_test.rb b/test/naver_map_test.rb
index 9a287de..b064bde 100644
--- a/test/naver_map_test.rb
+++ b/test/naver_map_test.rb
@@ -4,7 +4,8 @@
 
 class TestNaverMap < Minitest::Test
   def setup
-    @naver_map = NaverMap.new('9t01a7LRijYCbU1PEOlR', 'VY9dCKWgEa')
+    @naver_map = NaverMap.new(ENV['NAVER_MAP_CLIENT_ID'],
+                              ENV['NAVER_MAP_CLIENT_SECRET'])
   end
 
   def test_address_to_coordinates