diff --git a/CHANGELOG.md b/CHANGELOG.md
index d64351d..d5ec527 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,14 @@
 # Change Log
 
-## 0.4.0 - UNRELEASED
+## 1.0.0-rc1 - 2015-12-14
+
+### Added
+
+- CS check
+
+### Changed
+
+- RuntimeException is thrown when the StreamFactory cannot write to the underlying stream
 
 
 ## 0.3.0 - 2015-11-16
diff --git a/composer.json b/composer.json
index 51cc9c4..3b5e039 100644
--- a/composer.json
+++ b/composer.json
@@ -21,7 +21,7 @@
     },
     "extra": {
         "branch-alias": {
-            "dev-master": "0.4-dev"
+            "dev-master": "1.1-dev"
         }
     }
 }