diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 47709bd..16502c3 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1 +1 @@
-{".":"3.1.0"}
+{".":"4.0.0"}
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 21128a1..fe1d2ec 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,16 @@
 # Changelog
 
+## [4.0.0](https://github.com/MapColonies/openapi-helpers/compare/v3.1.0...v4.0.0) (2025-08-24)
+
+
+### ⚠ BREAKING CHANGES
+
+* unified CLI  generating TypeScript types and error classes from OpenAPI specifications (MAPCO-8469) ([#49](https://github.com/MapColonies/openapi-helpers/issues/49))
+
+### Features
+
+* unified CLI  generating TypeScript types and error classes from OpenAPI specifications (MAPCO-8469) ([#49](https://github.com/MapColonies/openapi-helpers/issues/49)) ([effbcca](https://github.com/MapColonies/openapi-helpers/commit/effbcca5354baffcd227720c7b6d0d1c45234d77))
+
 ## [3.1.0](https://github.com/MapColonies/openapi-helpers/compare/v3.0.0...v3.1.0) (2025-08-07)
 
 
diff --git a/package-lock.json b/package-lock.json
index e2b5ce0..4732842 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "@map-colonies/openapi-helpers",
-  "version": "3.1.0",
+  "version": "4.0.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@map-colonies/openapi-helpers",
-      "version": "3.1.0",
+      "version": "4.0.0",
       "license": "ISC",
       "dependencies": {
         "@apidevtools/json-schema-ref-parser": "^14.1.1",
diff --git a/package.json b/package.json
index 4915801..72012b4 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@map-colonies/openapi-helpers",
-  "version": "3.1.0",
+  "version": "4.0.0",
   "description": "A package that provides utilities for working with openapi files",
   "exports": {
     "./requestSender": {