diff --git a/CHANGELOG.md b/CHANGELOG.md
index a6bfc5f..0bcd7da 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,7 @@
 -----
 
 - `zh-TW` translate file fixed.
+- Use xxx_url to fix bad captcha URL for `config.action_controller.asset_host` enabled case.
 
 0.1.2
 -----
diff --git a/README.md b/README.md
index 4d27482..6dc7014 100644
--- a/README.md
+++ b/README.md
@@ -78,3 +78,7 @@ describe 'sign up and login', type: :feature do
 end
 ```
 
+## TODO
+
+- Use [rtesseract](https://github.com/dannnylo/rtesseract) to test OCR.
+
diff --git a/lib/rucaptcha/version.rb b/lib/rucaptcha/version.rb
index 6826f02..a1bf176 100644
--- a/lib/rucaptcha/version.rb
+++ b/lib/rucaptcha/version.rb
@@ -1,4 +1,3 @@
 module RuCaptcha
-  VERSION = '0.1.2'
+  VERSION = '0.1.3'
 end
-
diff --git a/lib/rucaptcha/view_helpers.rb b/lib/rucaptcha/view_helpers.rb
index dae0627..0844a8a 100644
--- a/lib/rucaptcha/view_helpers.rb
+++ b/lib/rucaptcha/view_helpers.rb
@@ -7,7 +7,7 @@ module RuCaptcha
 
     def rucaptcha_image_tag(opts = {})
       opts[:class] = opts[:class] || 'rucaptcha-image'
-      image_tag(ru_captcha.root_path, opts)
+      image_tag(ru_captcha.root_url, opts)
     end
   end
 end