diff --git a/package-lock.json b/package-lock.json
index ed05866..087d9f8 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -7572,7 +7572,7 @@
     },
     "packages/azure-functions-durable": {
       "name": "durable-functions",
-      "version": "4.0.0",
+      "version": "4.0.0-beta.1",
       "license": "MIT",
       "dependencies": {
         "@azure/functions": "^4.16.1",
diff --git a/packages/azure-functions-durable/CHANGELOG.md b/packages/azure-functions-durable/CHANGELOG.md
index 00858ae..f2fc94e 100644
--- a/packages/azure-functions-durable/CHANGELOG.md
+++ b/packages/azure-functions-durable/CHANGELOG.md
@@ -1,5 +1,15 @@
-# Changelog
+## Upcoming
 
-## TBD
+### New
 
-- Details to be finalized at release time.
+### Fixes
+
+
+## v4.0.0-beta.1 (2026-07-31)
+
+### Changes
+
+- docs(release): changelog, README, and copilot-instructions updates ([#339](https://github.com/microsoft/durabletask-js/pull/339))
+- feat(durable-functions): restore worker-side callHttp ([#318](https://github.com/microsoft/durabletask-js/issues/318)) ([#333](https://github.com/microsoft/durabletask-js/pull/333))
+- fix(durable-functions): route sync single-arg orchestrators to core-native ([#321](https://github.com/microsoft/durabletask-js/pull/321)) (#323)
+- Add `durable-functions@4.0.0` — Azure Functions Durable provider on the gRPC core (+ core host helpers, E2E CI, and release pipeline) ([#282](https://github.com/microsoft/durabletask-js/pull/282))
diff --git a/packages/azure-functions-durable/package.json b/packages/azure-functions-durable/package.json
index 5a4206a..0d19018 100644
--- a/packages/azure-functions-durable/package.json
+++ b/packages/azure-functions-durable/package.json
@@ -1,6 +1,6 @@
 {
   "name": "durable-functions",
-  "version": "4.0.0",
+  "version": "4.0.0-beta.1",
   "description": "Azure Functions Durable provider for the Durable Task JavaScript SDK",
   "main": "./dist/index.js",
   "types": "./dist/index.d.ts",