diff --git a/package.json b/package.json
index 74fc13f..d669806 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "@observablehq/database-proxy",
   "description": "A local proxy to connect private Observable notebooks to private databases",
-  "version": "3.4.0",
+  "version": "4.0.0",
   "type": "module",
   "engines": {
     "node": ">=16"