diff --git a/Changelog.md b/Changelog.md
index c8bc0f4..9dc153d 100644
--- a/Changelog.md
+++ b/Changelog.md
@@ -4,9 +4,22 @@ The change log describes what is "Added", "Removed", "Changed" or "Fixed" betwee
 
 ## UNRELEASED
 
+## 0.4.0
+
 ### Added
 
 * Support for the new `TaggableCacheItemPoolInterface`. 
+* Support for PSR-16 SimpleCache
+
+### Changed
+
+* The behavior of `CacheItem::getTags()` has changed. It will not return the tags stored in the cache storage. 
+
+### Removed
+
+* `CacheItem::getExpirationDate()`. Use `CacheItem::getExpirationTimestamp()`
+* `CacheItem::getTags()`. Use `CacheItem::getPreviousTags()`
+* `CacheItem::addTag()`. Use `CacheItem::setTags()`
 
 ## 0.3.3
 
diff --git a/composer.json b/composer.json
index 3c51e34..13a3d0c 100644
--- a/composer.json
+++ b/composer.json
@@ -50,7 +50,7 @@
     },
     "extra": {
         "branch-alias": {
-            "dev-master": "0.4-dev"
+            "dev-master": "0.5-dev"
         }
     }
 }