diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1082324..2390de3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,8 +1,12 @@
 # Changelog
 
+## 4.0.1
+
+* update development libraries
+
 ## 4.0.0
 
-* Dropped support for older EOL Node JS versions, minimum supported Node version is 14.0.0
+* dropped support for older EOL Node JS versions, minimum supported Node version is 14.0.0
 * updated axios to the version 1.6.2
 
 ## 3.11.0
diff --git a/package-lock.json b/package-lock.json
index 947bdb1..8fcfb37 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "postmark",
-  "version": "4.0.0",
+  "version": "4.0.1",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index abf2ee7..4af7739 100644
--- a/package.json
+++ b/package.json
@@ -9,7 +9,7 @@
     "sending",
     "transactional"
   ],
-  "version": "4.0.0",
+  "version": "4.0.1",
   "author": "Igor Balos",
   "contributors": [
     "Igor Balos",