### 4.1.3 (2016-04-22)
* Use data URIs for the image preview in the back end.
* Use DIRECTORY_SEPARATOR to convert kernel.cache_dir into a relative path (see #464).
* Always trigger the "isVisibleElement" hook (see contao/core#8312).
* Do not change all sessions when switching users (see contao/core#8158).
* Do not allow to close fieldsets with empty required fields (see contao/core#8300).
* Make the path related properties of the File class binary-safe (see contao/core#8295).
* Correctly validate and decode IDNA e-mail addresses (see contao/core#8306).
* Skip forward pages entirely in the book navigation module (see contao/core#5074).
* Do not add the X-Priority header in the Email class (see contao/core#8298).
* Determine the search index checksum in a more reliable way (see contao/core#7652).
### 4.1.2 (2016-03-22)
* Handle derived classes in the exception converter (see #462).
* Prevent the autofocus attribute from being added multiple times (see contao/core#8281).
* Respect the SSL settings of the root page when generating sitemaps (see contao/core#8270).
* Read from the temporary file if it has not been closed yet (see contao/core#8269).
* Always use HTTPS if the target server supports SSL connections (see contao/core#8183).
* Adjust the meta wizard field length to the column length (see contao/core#8277).
* Correctly handle custom mime icon paths (see contao/core#8275).
* Show the 404 error page if an unpublished article is requested (see contao/core#8264).
* Correctly count the URLs when rebuilding the search index (see contao/core#8262).
* Ensure that every image has a width and height attribute (see contao/core#8162).
* Set the correct mime type when embedding SVG images (see contao/core#8245).
* Handle the "float_left" and "float_right" classes in the back end (see contao/core#8239).
* Consider the fallback language if a page alias is ambiguous (see contao/core#8142).
* Fix the error 403/404 redirect (see contao/website#74).
### 4.1.1 (2015-03-03)
* Remove the "disable IP check" field from the back end settings (see #436).
* Do not quote the search string in `FIND_IN_SET()` (see #424).
* Always fix the domain and language when generating URLs (see contao/core#8238).
* Fix two issues with the flexible back end theme (see contao/core#8227).
* Correctly toggle custom page type icons (see contao/core#8236).
* Correctly render the links in the monthly/yearly event list menu (see contao/core#8140).
* Skip the registration related fields if a user is duplicated (see contao/core#8185).
* Correctly show the form field type help text (see contao/core#8200).
* Correctly create the initial version of a record (see contao/core#8141).
* Correctly show the "expand preview" buttons (see contao/core#8146).
* Correctly check that a password does not match the username (see contao/core#8209).
* Check if a directory exists before executing `mkdir()` (see contao/core#8150).
* Do not link to the maintenance module if the user cannot access it (see contao/core#8151).
* Show the "new folder" button in the template manager (see contao/core#8138).
Contao 4.1 is second minor release of Contao 4, which has incompatible API
from Contao 3.
* Now Contao is Symfony bundle.
* Contao 4 dose not use .htaccess files for protexting directory.
* DocumentRoot is "web" subdirecotry.
* XHTML support has gone, HTML5 only.
* Schema.org markup support.
Currently, no extension repository support yet.
