diff --git a/Gemfile.lock b/Gemfile.lock
index 428a7bd..c4f5d6b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -9,6 +9,7 @@ GEM
   specs:
     domain_name (0.5.20161021)
       unf (>= 0.0.5, < 1.0.0)
+    dotenv (2.1.1)
     http-cookie (1.0.3)
       domain_name (~> 0.5)
     mime-types (3.1)
@@ -30,6 +31,7 @@ PLATFORMS
 
 DEPENDENCIES
   bundler (~> 1.13)
+  dotenv (~> 2.1.1)
   minitest (~> 5.8, >= 5.8.3)
   naver_map!
   rake (~> 11.2, >= 11.2.2)
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