diff --git a/spec/features/sessions_spec.rb b/spec/features/sessions_spec.rb
index 4188728..6c44840 100644
--- a/spec/features/sessions_spec.rb
+++ b/spec/features/sessions_spec.rb
@@ -1,5 +1,5 @@
 describe "sessions" do
-  let(:exists_user) { FactoryGirl.create(:user) }
+  let(:exists_user) { create(:user) }
 
   describe "the sign in process" do
     let(:submit_label) { I18n.t("terms.sign_in") }
@@ -20,7 +20,7 @@ describe "sessions" do
     end
 
     context "sign in with non-exists user" do
-      let(:user) { FactoryGirl.build(:user) }
+      let(:user) { build(:user) }
 
       it "current location is not root_path" do
         current_path.should_not == root_path
diff --git a/spec/features/users_spec.rb b/spec/features/users_spec.rb
index d6bb86e..68146de 100644
--- a/spec/features/users_spec.rb
+++ b/spec/features/users_spec.rb
@@ -1,5 +1,5 @@
 describe "users" do
-  let(:exists_user) { FactoryGirl.create(:user) }
+  let(:exists_user) { create(:user) }
 
   describe "edit" do
     let(:url) { user_path }
diff --git a/spec/models/fluentd_spec.rb b/spec/models/fluentd_spec.rb
index 5133ff7..f124e08 100644
--- a/spec/models/fluentd_spec.rb
+++ b/spec/models/fluentd_spec.rb
@@ -5,7 +5,7 @@ describe Fluentd do
     let(:path) { fluentd.send(column) }
 
     subject do
-      fluentd.check_permission(column) 
+      fluentd.check_permission(column)
       fluentd.errors
     end
 
@@ -55,7 +55,7 @@ describe Fluentd do
     end
   end
 
-  let(:fluentd) { FactoryGirl.build(:fluentd) }
+  let(:fluentd) { build(:fluentd) }
 
   describe "#valid?" do
     before do
diff --git a/spec/models/login_token_spec.rb b/spec/models/login_token_spec.rb
index 4481ecc..87c7c61 100644
--- a/spec/models/login_token_spec.rb
+++ b/spec/models/login_token_spec.rb
@@ -7,10 +7,10 @@ describe LoginToken do
 
     before do
       active.times do |n|
-        FactoryGirl.create(:login_token, expired_at: (n + 1).day.from_now)
+        create(:login_token, expired_at: (n + 1).day.from_now)
       end
       inactive.times do |n|
-        FactoryGirl.create(:login_token, expired_at: (n + 1).day.ago)
+        create(:login_token, expired_at: (n + 1).day.ago)
       end
     end
 
diff --git a/spec/models/plugin_spec.rb b/spec/models/plugin_spec.rb
index 02a2316..3f60678 100644
--- a/spec/models/plugin_spec.rb
+++ b/spec/models/plugin_spec.rb
@@ -1,7 +1,7 @@
 require 'spec_helper'
 
 describe Plugin do
-  let(:plugin) { FactoryGirl.build(:plugin) }
+  let(:plugin) { build(:plugin) }
 
   before do
     Plugin.stub(:gemfile_path).and_return { Rails.root + "tmp/fluentd-ui-test-gemfile.plugins" }
@@ -110,7 +110,7 @@ describe Plugin do
   end
 
   describe "#uninstall!" do
-    let(:installed_plugin) { FactoryGirl.build(:plugin, gem_name: "fluent-plugin-foobar") }
+    let(:installed_plugin) { build(:plugin, gem_name: "fluent-plugin-foobar") }
 
     before do
       installed_plugin.stub(:fluent_gem).and_return { true }
@@ -127,7 +127,7 @@ describe Plugin do
   end
 
   describe "#upgrade!" do
-    let(:installed_plugin) { FactoryGirl.build(:plugin, gem_name: "fluent-plugin-foobar", version: current_version) }
+    let(:installed_plugin) { build(:plugin, gem_name: "fluent-plugin-foobar", version: current_version) }
     let(:current_version) { "1.0.0" }
     let(:target_version) { "1.2.0" }
 
@@ -155,7 +155,7 @@ describe Plugin do
   end
 
   describe "#latest_version?" do
-    let(:plugin) { FactoryGirl.build(:plugin, version: gem_version.to_s) }
+    let(:plugin) { build(:plugin, version: gem_version.to_s) }
     let(:gem_version) { Gem::Version.new("1.0.0") }
 
     before do
diff --git a/spec/models/user_spec.rb b/spec/models/user_spec.rb
index 6206fa8..0ff9930 100644
--- a/spec/models/user_spec.rb
+++ b/spec/models/user_spec.rb
@@ -1,7 +1,7 @@
 require 'spec_helper'
 
 describe User do
-  let(:user) { FactoryGirl.build(:user) }
+  let(:user) { build(:user) }
 
   describe "#valid?" do
     it { user.should be_valid }
@@ -13,7 +13,7 @@ describe User do
       end
 
       it "taken name is invalid" do
-        another_user = FactoryGirl.create(:user)
+        another_user = create(:user)
         user.name = another_user.name
         user.should_not be_valid
       end