diff --git a/CHANGELOG.md b/CHANGELOG.md
index a13222c83..60d056ccc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,14 +7,14 @@ are written in the native on-disk format, PGCN v1. For the forward-looking plan
 [design/ROADMAP.md](design/ROADMAP.md); for full history see the git log.
 
 The extension's `default_version` is `1.0-alpha5`.
-`v1.0-alpha4` is the latest published pre-release. Upgrade scripts from
+`v1.0-alpha5` is the latest published pre-release. Upgrade scripts from
 every previously shipped version ship with it (`1.0-dev`, which the v1.0-alpha tag
 installed, `1.0-alpha`, `1.0-alpha2`, `1.0-alpha3`, and `1.0-alpha4`), so a single
 `ALTER EXTENSION pgcolumnar UPDATE` reaches `1.0-alpha5` from any of them. Older
 notes in this file describe `default_version` as pinned at an earlier version, each
 true until the next version shipped.
 
-## [Unreleased]
+## [1.0-alpha5] - 2026-10-13
 
 ### Added
 
diff --git a/README.md b/README.md
index 4c565b11d..87e5c72dc 100644
--- a/README.md
+++ b/README.md
@@ -25,7 +25,7 @@ pgColumnar builds from one source tree on PostgreSQL 15 through 18, with 19
 validated against 19beta2, and is
 licensed under the [MIT License](LICENSE). It is [pre-release](docs/limitations.md#release-status); the version marker
 is `1.0-alpha5`, recorded in `VERSION`.
-The latest published pre-release is `v1.0-alpha4`. A table `USING pgcolumnar` is stored in the
+The latest published pre-release is `v1.0-alpha5`. A table `USING pgcolumnar` is stored in the
 native on-disk format, PGCN v1.
 
 ## Documentation
diff --git a/RELEASE_NOTES_1.0-alpha5.md b/RELEASE_NOTES_1.0-alpha5.md
index 4d1f56926..235709030 100644
--- a/RELEASE_NOTES_1.0-alpha5.md
+++ b/RELEASE_NOTES_1.0-alpha5.md
@@ -1,6 +1,6 @@
 # pgColumnar 1.0-alpha5 release notes
 
-Release date: TODO(release)
+Release date: 2026-10-13
 Previous release: 1.0-alpha4 (2026-09-17)
 
 pgColumnar is a columnar table access method for PostgreSQL. This is the fifth
diff --git a/docs/installation.md b/docs/installation.md
index 2618c47bf..5a65105e2 100644
--- a/docs/installation.md
+++ b/docs/installation.md
@@ -160,7 +160,7 @@ columnar table with it.
 ### Upgrading to 1.0-alpha5
 
 `1.0-alpha5`, recorded in `VERSION`, is what this source tree installs. The
-latest published pre-release is `v1.0-alpha4`.
+latest published pre-release is `v1.0-alpha5`.
 `ALTER EXTENSION pgcolumnar UPDATE` (step 3 above) reaches `1.0-alpha5` from every
 previously published version: `1.0-dev`, which the `v1.0-alpha` tag installed,
 `1.0-alpha`, `1.0-alpha2`, `1.0-alpha3`, and `1.0-alpha4`. PostgreSQL applies
diff --git a/docs/roadmap.md b/docs/roadmap.md
index 73c5b63bc..32597d4a0 100644
--- a/docs/roadmap.md
+++ b/docs/roadmap.md
@@ -13,7 +13,7 @@ Issues are the authority on anything being worked now.
 
 pgColumnar is [pre-release](limitations.md#release-status). The version marker is
 `1.0-alpha5`, recorded in `VERSION`. The
-latest published pre-release is `v1.0-alpha4`. A table `USING pgcolumnar` is stored in the
+latest published pre-release is `v1.0-alpha5`. A table `USING pgcolumnar` is stored in the
 native on-disk format, PGCN v1.
 
 ## Releases to 1.0