diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4ac42a2..136910c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,9 +1,9 @@
-## 3.1.0
- - add _cefparsefailure tag on failed decode
+## 4.0.0
+ - Implements the dictionary translation for abbreviated CEF field names from chapter Chapter 2: ArcSight Extension Dictionary    page 3 of 39 [CEF specification](https://protect724.hp.com/docs/DOC-1072).
+ - add `_cefparsefailure` tag on failed decode
 
 ## 3.0.0
  - breaking: Updated plugin to use new Java Event APIs
- - Implements the dictionary translation for abbreviated CEF field names from chapter Chapter 2: ArcSight Extension Dictionary page 3 of 39 [CEF specification](https://protect724.hp.com/docs/DOC-1072). 
 
 ## 2.1.3
  - Switch in-place sub! to sub when extracting `cef_version`. new Logstash Java Event does not support in-place String changes.
diff --git a/logstash-codec-cef.gemspec b/logstash-codec-cef.gemspec
index 193b8bc..341b8c8 100644
--- a/logstash-codec-cef.gemspec
+++ b/logstash-codec-cef.gemspec
@@ -1,7 +1,7 @@
 Gem::Specification.new do |s|
 
   s.name            = 'logstash-codec-cef'
-  s.version         = '3.1.0'
+  s.version         = '4.0.0'
   s.platform        = 'java'
   s.licenses        = ['Apache License (2.0)']
   s.summary         = "CEF codec to parse and encode CEF formated logs"