diff --git a/CHANGELOG.md b/CHANGELOG.md
index 79f6111..ce8c7eb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,17 @@
+### 0.4.0
+
+Features:
+
+ * Added option to output YAML 1.1
+ * Added benchmark for processing YAML input
+ * Serialization for OrderedMap
+ * Use !nim:field for object field names (#12)
+
+Bugfixes:
+
+ * Code refactoring (#9, #10, #11, #13)
+ * Some small improvements parsing and presenting
+
 ### 0.3.0
 
 Features:
diff --git a/README.md b/README.md
index f594945..f7fdbe8 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # NimYAML - YAML implementation for Nim
 
-NimYAML is currently being developed. The current release 0.3.0 is not
+NimYAML is currently being developed. The current release 0.4.0 is not
 considered stable. See [the documentation](http://flyx.github.io/NimYAML/) for
 an overview of already available features.
 
diff --git a/nimyaml.nimble b/nimyaml.nimble
index c3cebf8..e1815fe 100644
--- a/nimyaml.nimble
+++ b/nimyaml.nimble
@@ -1,6 +1,6 @@
 # Package
 
-version       = "0.3.0"
+version       = "0.4.0"
 author        = "Felix Krause"
 description   = "YAML 1.2 implementation for Nim"
 license       = "MIT"