diff --git a/package-lock.json b/package-lock.json
index 61fed5d..81e6a3e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "@ideal-postcodes/openapi",
-  "version": "4.2.1",
+  "version": "4.3.0-beta.1",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
diff --git a/package.json b/package.json
index d9bbb4c..0bb43c7 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "@ideal-postcodes/openapi",
   "description": "Ideal Postcodes OpenAPI v3 specifications",
-  "version": "4.2.1",
+  "version": "4.3.0-beta.1",
   "devDependencies": {
     "@cablanchard/semantic-release": "~1.3.4",
     "@cablanchard/tsconfig": "~2.0.0",