diff --git a/CHANGELOG.md b/CHANGELOG.md
index e775deb..548b569 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,10 @@
 # Changelog
 
+## 4.0.3
+
+* updated models to support adding content disposition to attachments
+* update domain model
+
 ## 4.0.2
 
 * updated models to be more accurate mostly within webhook payloads area
diff --git a/package-lock.json b/package-lock.json
index 88744d9..c8ff4a5 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "postmark",
-  "version": "4.0.2",
+  "version": "4.0.3",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index 89fc362..649d088 100644
--- a/package.json
+++ b/package.json
@@ -9,7 +9,7 @@
     "sending",
     "transactional"
   ],
-  "version": "4.0.2",
+  "version": "4.0.3",
   "author": "Igor Balos",
   "contributors": [
     "Igor Balos",