diff --git a/package-lock.json b/package-lock.json
index dddfa52..c9fb09d 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "pa11y-webservice-client-node",
-  "version": "3.0.0",
+  "version": "4.0.0",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "pa11y-webservice-client-node",
-      "version": "3.0.0",
+      "version": "4.0.0",
       "license": "LGPL-3.0-only",
       "dependencies": {
         "request": "~2.88.2"
diff --git a/package.json b/package.json
index cb0606d..534c95d 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "pa11y-webservice-client-node",
-  "version": "3.0.0",
+  "version": "4.0.0",
   "engines": {
     "node": ">=18"
   },