diff --git a/CHANGELOG.md b/CHANGELOG.md
index 50a1b6a..2360209 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [1.9.0] - 2026-09-28
+
 ### Added
 - **GSA eBuy requests** (Tango API 5.1.0). Four methods over the `/api/ebuy/` resource: `list_ebuy_requests()`, `get_ebuy_request()`, `get_ebuy_attachment_url()` and `get_ebuy_access()`, plus `EbuyRequest` / `EbuyAttachment` schemas, an `EbuyAccess` result type, and the `EBUY_REQUESTS_MINIMAL` / `EBUY_REQUESTS_COMPREHENSIVE` defaults. These are the RFQs, RFPs and RFIs posted to GSA eBuy. All fourteen of the API's filters are explicit named parameters, including `search` (which also matches attachment text), `reference_number`, `sin`, `agency` and `contract_number`.
 
diff --git a/pyproject.toml b/pyproject.toml
index fbc6723..c675e80 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "tango-python"
-version = "1.8.0"
+version = "1.9.0"
 description = "Python SDK for the Tango API"
 readme = "README.md"
 requires-python = ">=3.12"
diff --git a/tango/__init__.py b/tango/__init__.py
index 987cf34..1212796 100644
--- a/tango/__init__.py
+++ b/tango/__init__.py
@@ -59,7 +59,7 @@
 )
 from .webhooks.receiver import Delivery, WebhookReceiver
 
-__version__ = "1.8.0"
+__version__ = "1.9.0"
 __all__ = [
     "TangoClient",
     "TangoAPIError",
diff --git a/uv.lock b/uv.lock
index ac6028c..cde6ddc 100644
--- a/uv.lock
+++ b/uv.lock
@@ -515,7 +515,7 @@ wheels = [
 
 [[package]]
 name = "tango-python"
-version = "1.8.0"
+version = "1.9.0"
 source = { editable = "." }
 dependencies = [
     { name = "httpx" },