diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index d6f5405..e6f8775 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "3.0.1"
+  ".": "4.0.0"
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index fde5fd5..0fb4915 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,16 @@
 # Changelog
 
+## [4.0.0](https://github.com/Speechify-AI/sdk-python/compare/3.0.1...4.0.0) (2026-08-18)
+
+
+### ⚠ BREAKING CHANGES
+
+* the default API version is now 2026-09-13.
+
+### Features
+
+* regenerate SDK for API 2026-09-13 with consent-challenge voice cloning ([#27](https://github.com/Speechify-AI/sdk-python/issues/27)) ([f3f323d](https://github.com/Speechify-AI/sdk-python/commit/f3f323dcba6f9aa9290be47ef8bbcaff06987d18))
+
 ## [3.0.1](https://github.com/SpeechifyInc/speechify-api-sdk-python/compare/3.0.0...3.0.1) (2026-07-10)