diff --git a/.changes/1.9.0-b1.md b/.changes/1.9.0-b1.md
new file mode 100644
index 00000000..9a06cee4
--- /dev/null
+++ b/.changes/1.9.0-b1.md
@@ -0,0 +1,31 @@
+## dbt-postgres 1.9.0-b1 - September 25, 2024
+
+### Features
+
+- Add tests for cross-database `cast` macro ([#76](https://github.com/dbt-labs/dbt-postgres/issues/76))
+- Cross-database `date` macro ([#82](https://github.com/dbt-labs/dbt-postgres/issues/82))
+- Add support for Python 3.12 ([#17](https://github.com/dbt-labs/dbt-postgres/issues/17))
+- Allow configuring snapshot column names ([#144](https://github.com/dbt-labs/dbt-postgres/issues/144))
+- Microbatch incremental strategy implementation: merge ([#149](https://github.com/dbt-labs/dbt-postgres/issues/149))
+
+### Fixes
+
+- Fix the semicolon semantics for indexes while respecting other bug fix ([#85](https://github.com/dbt-labs/dbt-postgres/issues/85))
+- Default to psycopg2-binary and allow overriding to psycopg2 via DBT_PSYCOPG2_NAME (restores previous behavior) ([#96](https://github.com/dbt-labs/dbt-postgres/issues/96))
+- Fix `persist_docs` for `materialized_view` materializations. Previously, using this configuration with materialized view models would lead to an error. ([#120](https://github.com/dbt-labs/dbt-postgres/issues/120))
+
+### Under the Hood
+
+- Add support for experimental record/replay testing. ([#123](https://github.com/dbt-labs/dbt-postgres/issues/123))
+- Updating changie.yaml to add contributors and PR links ([#109](https://github.com/dbt-labs/dbt-postgres/issues/109))
+
+### Contributors
+- [@dbeatty10](https://github.com/dbeatty10) ([#76](https://github.com/dbt-labs/dbt-postgres/issues/76), [#82](https://github.com/dbt-labs/dbt-postgres/issues/82))
+- [@gshank](https://github.com/gshank) ([#144](https://github.com/dbt-labs/dbt-postgres/issues/144))
+- [@leahwicz](https://github.com/leahwicz) ([#109](https://github.com/dbt-labs/dbt-postgres/issues/109))
+- [@michelleark](https://github.com/michelleark) ([#149](https://github.com/dbt-labs/dbt-postgres/issues/149))
+- [@mikealfare](https://github.com/mikealfare) ([#17](https://github.com/dbt-labs/dbt-postgres/issues/17), [#96](https://github.com/dbt-labs/dbt-postgres/issues/96))
+- [@morsapaes](https://github.com/morsapaes) ([#120](https://github.com/dbt-labs/dbt-postgres/issues/120))
+- [@peterallenwebb](https://github.com/peterallenwebb) ([#123](https://github.com/dbt-labs/dbt-postgres/issues/123))
+- [@versusfacit](https://github.com/versusfacit) ([#85](https://github.com/dbt-labs/dbt-postgres/issues/85))
+
diff --git a/.changes/unreleased/Features-20240430-185700.yaml b/.changes/1.9.0/Features-20240430-185700.yaml
similarity index 100%
rename from .changes/unreleased/Features-20240430-185700.yaml
rename to .changes/1.9.0/Features-20240430-185700.yaml
diff --git a/.changes/unreleased/Features-20240501-151856.yaml b/.changes/1.9.0/Features-20240501-151856.yaml
similarity index 100%
rename from .changes/unreleased/Features-20240501-151856.yaml
rename to .changes/1.9.0/Features-20240501-151856.yaml
diff --git a/.changes/unreleased/Features-20240731-210800.yaml b/.changes/1.9.0/Features-20240731-210800.yaml
similarity index 100%
rename from .changes/unreleased/Features-20240731-210800.yaml
rename to .changes/1.9.0/Features-20240731-210800.yaml
diff --git a/.changes/unreleased/Features-20240903-160221.yaml b/.changes/1.9.0/Features-20240903-160221.yaml
similarity index 100%
rename from .changes/unreleased/Features-20240903-160221.yaml
rename to .changes/1.9.0/Features-20240903-160221.yaml
diff --git a/.changes/unreleased/Features-20240911-141416.yaml b/.changes/1.9.0/Features-20240911-141416.yaml
similarity index 100%
rename from .changes/unreleased/Features-20240911-141416.yaml
rename to .changes/1.9.0/Features-20240911-141416.yaml
diff --git a/.changes/unreleased/Fixes-20240514-193201.yaml b/.changes/1.9.0/Fixes-20240514-193201.yaml
similarity index 100%
rename from .changes/unreleased/Fixes-20240514-193201.yaml
rename to .changes/1.9.0/Fixes-20240514-193201.yaml
diff --git a/.changes/unreleased/Fixes-20240605-202614.yaml b/.changes/1.9.0/Fixes-20240605-202614.yaml
similarity index 100%
rename from .changes/unreleased/Fixes-20240605-202614.yaml
rename to .changes/1.9.0/Fixes-20240605-202614.yaml
diff --git a/.changes/unreleased/Fixes-20240626-163930.yaml b/.changes/1.9.0/Fixes-20240626-163930.yaml
similarity index 100%
rename from .changes/unreleased/Fixes-20240626-163930.yaml
rename to .changes/1.9.0/Fixes-20240626-163930.yaml
diff --git a/.changes/unreleased/Under the Hood-20240716-172442.yaml b/.changes/1.9.0/Under the Hood-20240716-172442.yaml
similarity index 100%
rename from .changes/unreleased/Under the Hood-20240716-172442.yaml
rename to .changes/1.9.0/Under the Hood-20240716-172442.yaml
diff --git a/.changes/unreleased/Under the Hood-20240731-075011.yaml b/.changes/1.9.0/Under the Hood-20240731-075011.yaml
similarity index 100%
rename from .changes/unreleased/Under the Hood-20240731-075011.yaml
rename to .changes/1.9.0/Under the Hood-20240731-075011.yaml
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5beb02ea..fc95b95f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,38 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html),
 and is generated by [Changie](https://github.com/miniscruff/changie).
 
+## dbt-postgres 1.9.0-b1 - September 25, 2024
+
+### Features
+
+- Add tests for cross-database `cast` macro ([#76](https://github.com/dbt-labs/dbt-postgres/issues/76))
+- Cross-database `date` macro ([#82](https://github.com/dbt-labs/dbt-postgres/issues/82))
+- Add support for Python 3.12 ([#17](https://github.com/dbt-labs/dbt-postgres/issues/17))
+- Allow configuring snapshot column names ([#144](https://github.com/dbt-labs/dbt-postgres/issues/144))
+- Microbatch incremental strategy implementation: merge ([#149](https://github.com/dbt-labs/dbt-postgres/issues/149))
+
+### Fixes
+
+- Fix the semicolon semantics for indexes while respecting other bug fix ([#85](https://github.com/dbt-labs/dbt-postgres/issues/85))
+- Default to psycopg2-binary and allow overriding to psycopg2 via DBT_PSYCOPG2_NAME (restores previous behavior) ([#96](https://github.com/dbt-labs/dbt-postgres/issues/96))
+- Fix `persist_docs` for `materialized_view` materializations. Previously, using this configuration with materialized view models would lead to an error. ([#120](https://github.com/dbt-labs/dbt-postgres/issues/120))
+
+### Under the Hood
+
+- Add support for experimental record/replay testing. ([#123](https://github.com/dbt-labs/dbt-postgres/issues/123))
+- Updating changie.yaml to add contributors and PR links ([#109](https://github.com/dbt-labs/dbt-postgres/issues/109))
+
+### Contributors
+- [@dbeatty10](https://github.com/dbeatty10) ([#76](https://github.com/dbt-labs/dbt-postgres/issues/76), [#82](https://github.com/dbt-labs/dbt-postgres/issues/82))
+- [@gshank](https://github.com/gshank) ([#144](https://github.com/dbt-labs/dbt-postgres/issues/144))
+- [@leahwicz](https://github.com/leahwicz) ([#109](https://github.com/dbt-labs/dbt-postgres/issues/109))
+- [@michelleark](https://github.com/michelleark) ([#149](https://github.com/dbt-labs/dbt-postgres/issues/149))
+- [@mikealfare](https://github.com/mikealfare) ([#17](https://github.com/dbt-labs/dbt-postgres/issues/17), [#96](https://github.com/dbt-labs/dbt-postgres/issues/96))
+- [@morsapaes](https://github.com/morsapaes) ([#120](https://github.com/dbt-labs/dbt-postgres/issues/120))
+- [@peterallenwebb](https://github.com/peterallenwebb) ([#123](https://github.com/dbt-labs/dbt-postgres/issues/123))
+- [@versusfacit](https://github.com/versusfacit) ([#85](https://github.com/dbt-labs/dbt-postgres/issues/85))
+
+
 ## Previous Releases
 For information on prior major and minor releases, see their changelogs:
 - [1.8](https://github.com/dbt-labs/dbt-postgres/blob/1.8.latest/CHANGELOG.md)
diff --git a/dbt/adapters/postgres/__version__.py b/dbt/adapters/postgres/__version__.py
index 6698ed64..a4077fff 100644
--- a/dbt/adapters/postgres/__version__.py
+++ b/dbt/adapters/postgres/__version__.py
@@ -1 +1 @@
-version = "1.9.0a1"
+version = "1.9.0b1"