diff --git a/CHANGELOG.md b/CHANGELOG.md
index d7b8605..e1427e0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 4.0.0
+
+  - Added support for RFC6759 decoding of application_id. **This is a breaking change to the way application_id is decoded. The format changes from e.g. 0:40567 to 0..12356..40567**
+
 ## 3.14.1
 
   - Fixes exception when receiving Netflow 9 from H3C devices
diff --git a/CONTRIBUTORS b/CONTRIBUTORS
index 44ddd06..be4b623 100644
--- a/CONTRIBUTORS
+++ b/CONTRIBUTORS
@@ -36,6 +36,7 @@ Contributors:
 * Will Rigby (wrigby)
 * Yehonatan Devorkin (Devorkin)
 * Rojuinex
+* Sjaak01
 * debadair
 * HenryTheSir
 * hkshirish
diff --git a/logstash-codec-netflow.gemspec b/logstash-codec-netflow.gemspec
index 7ca751a..6a6f6af 100644
--- a/logstash-codec-netflow.gemspec
+++ b/logstash-codec-netflow.gemspec
@@ -1,7 +1,7 @@
 Gem::Specification.new do |s|
 
   s.name            = 'logstash-codec-netflow'
-  s.version         = '3.14.1'
+  s.version         = '4.0.0'
   s.licenses        = ['Apache License (2.0)']
   s.summary         = "Reads Netflow v5, Netflow v9 and IPFIX data"
   s.description     = "This gem is a Logstash plugin required to be installed on top of the Logstash core pipeline using $LS_HOME/bin/logstash-plugin install gemname. This gem is not a stand-alone program"