diff --git a/CHANGELOG.md b/CHANGELOG.md
index eb6b242..cff056d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,6 +13,11 @@ Refactors, CI, and formatting land in the git history, not here.
 
 ## [Unreleased]
 
+## [3.0.0b3] — 2026-08-10
+
+Beta iteration: one shape for every cohort filter, and no request that silently answers with the
+whole archive instead of your cohort (both beta contract changes).
+
 ### Changed
 
 - **Breaking (beta): `POST /v3/cohort/counts` and `POST /v3/licenses` now take the filter under
@@ -104,6 +109,7 @@ served by a different backend and v3 lives only under `/v3/*`.
   (NCI security policy). Max-age is configurable via `IDC_API_HSTS_MAX_AGE` — default one year;
   dev/test deploys use 3600.
 
-[Unreleased]: https://github.com/ImagingDataCommons/IDC-REST-MCP/compare/v3.0.0b2...HEAD
+[Unreleased]: https://github.com/ImagingDataCommons/IDC-REST-MCP/compare/v3.0.0b3...HEAD
+[3.0.0b3]: https://github.com/ImagingDataCommons/IDC-REST-MCP/compare/v3.0.0b2...v3.0.0b3
 [3.0.0b2]: https://github.com/ImagingDataCommons/IDC-REST-MCP/compare/v3.0.0b1...v3.0.0b2
 [3.0.0b1]: https://github.com/ImagingDataCommons/IDC-REST-MCP/releases/tag/v3.0.0b1
diff --git a/pyproject.toml b/pyproject.toml
index 4a4d079..cdcde15 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "idc-api"
-version = "3.0.0b2"
+version = "3.0.0b3"
 description = "LLM-first REST API and MCP server for NCI Imaging Data Commons, backed by idc-index Parquet + DuckDB."
 readme = "README.md"
 requires-python = ">=3.11"
diff --git a/uv.lock b/uv.lock
index 94731a6..efc2434 100644
--- a/uv.lock
+++ b/uv.lock
@@ -513,7 +513,7 @@ wheels = [
 
 [[package]]
 name = "idc-api"
-version = "3.0.0b2"
+version = "3.0.0b3"
 source = { editable = "." }
 dependencies = [
     { name = "duckdb" },