diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0cc7df1..ba19b88 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,6 +15,8 @@ to do about it, and a link to the guide with the detail. What the first `migrati
 upgrade does is in [docs/upgrading.md](docs/upgrading.md), and
 [CONTRIBUTING.md](CONTRIBUTING.md#changelog) has the rules.
 
+## [5.5.1] — 2026-10-20
+
 ## [5.5.0] — 2026-10-20
 
 The last 5.x minor with a change of its own: the line refuses EF Core 11, whose successor is `CodoMetis.EFCore.SchemaKit`. Some fixes change what an existing model scaffolds or applies: [Changed answers in 5.5.0](https://github.com/CaffeinatedCoder/EFCore.ComplexIndexes/blob/main/docs/upgrading.md#changed-answers-in-550).
@@ -229,6 +231,7 @@ Eleven fixes from a review of 5.0.1. The first three were migrations that scaffo
 - Expression indexes: descending parts render `DESC`, declared with `ExpressionIndexBuilder.Descending()`.
 - Migrations: the drops of complex indexes run before the base operations, so moving an index between `HasIndex` and a complex declaration under one name applies.
 
+[5.5.1]: https://github.com/CaffeinatedCoder/EFCore.ComplexIndexes/releases/tag/v5.5.1
 [5.5.0]: https://github.com/CaffeinatedCoder/EFCore.ComplexIndexes/releases/tag/v5.5.0
 [5.4.1]: https://github.com/CaffeinatedCoder/EFCore.ComplexIndexes/releases/tag/v5.4.1
 [5.4.0]: https://github.com/CaffeinatedCoder/EFCore.ComplexIndexes/releases/tag/v5.4.0
diff --git a/Directory.Build.props b/Directory.Build.props
index 21679e0..2c6259d 100644
--- a/Directory.Build.props
+++ b/Directory.Build.props
@@ -1,6 +1,6 @@
 <Project>
     <PropertyGroup>
-        <Version>5.5.0</Version>
+        <Version>5.5.1</Version>
         <Authors>CaffeinatedCoder</Authors>
         <PackageLicenseExpression>MIT</PackageLicenseExpression>
         <GenerateDocumentationFile>true</GenerateDocumentationFile>
@@ -63,7 +63,7 @@
     -->
     <PropertyGroup>
         <EnablePackageValidation>true</EnablePackageValidation>
-        <PackageValidationBaselineVersion>5.4.1</PackageValidationBaselineVersion>
+        <PackageValidationBaselineVersion>5.5.0</PackageValidationBaselineVersion>
     </PropertyGroup>
 
     <!--
diff --git a/SECURITY.md b/SECURITY.md
index 63199c9..3e9b0df 100644
--- a/SECURITY.md
+++ b/SECURITY.md
@@ -54,8 +54,8 @@ is to upgrade.
 
 | Version | Supported |
 |---|---|
-| 5.4.x | ✅ |
-| < 5.4 | ❌ |
+| 5.5.x | ✅ |
+| < 5.5 | ❌ |
 
 Previews (`11.0.0-preview.N`) are not supported versions and have no row: a fix reaches a preview
 in the next preview.
diff --git a/src/EFCore.ComplexIndexes.PostgreSQL/CHANGELOG.md b/src/EFCore.ComplexIndexes.PostgreSQL/CHANGELOG.md
index 7ef7958..f4adf92 100644
--- a/src/EFCore.ComplexIndexes.PostgreSQL/CHANGELOG.md
+++ b/src/EFCore.ComplexIndexes.PostgreSQL/CHANGELOG.md
@@ -4,6 +4,10 @@ The changes that affect the PostgreSQL satellite, newest first. The
 [root changelog](https://github.com/CaffeinatedCoder/EFCore.ComplexIndexes/blob/main/CHANGELOG.md)
 covers all three packages, which share one version number and release together.
 
+## [5.5.1] — 2026-10-20
+
+No change in this package.
+
 ## [5.5.0] — 2026-10-20
 
 The last 5.x minor with a change of its own: the line refuses EF Core 11, whose successor is `CodoMetis.EFCore.SchemaKit.PostgreSQL`.
diff --git a/src/EFCore.ComplexIndexes.SqlServer/CHANGELOG.md b/src/EFCore.ComplexIndexes.SqlServer/CHANGELOG.md
index f4fc108..07a2db0 100644
--- a/src/EFCore.ComplexIndexes.SqlServer/CHANGELOG.md
+++ b/src/EFCore.ComplexIndexes.SqlServer/CHANGELOG.md
@@ -4,6 +4,10 @@ The changes that affect the SQL Server satellite, newest first. The
 [root changelog](https://github.com/CaffeinatedCoder/EFCore.ComplexIndexes/blob/main/CHANGELOG.md)
 covers all three packages, which share one version number and release together.
 
+## [5.5.1] — 2026-10-20
+
+No change in this package.
+
 ## [5.5.0] — 2026-10-20
 
 The last 5.x minor with a change of its own: the line refuses EF Core 11, whose successor is `CodoMetis.EFCore.SchemaKit.SqlServer`.
diff --git a/src/EFCore.ComplexIndexes/CHANGELOG.md b/src/EFCore.ComplexIndexes/CHANGELOG.md
index 7a1c953..29320ba 100644
--- a/src/EFCore.ComplexIndexes/CHANGELOG.md
+++ b/src/EFCore.ComplexIndexes/CHANGELOG.md
@@ -4,6 +4,10 @@ The changes that affect the core package, newest first. The
 [root changelog](https://github.com/CaffeinatedCoder/EFCore.ComplexIndexes/blob/main/CHANGELOG.md)
 covers all three packages, which share one version number and release together.
 
+## [5.5.1] — 2026-10-20
+
+No change in this package.
+
 ## [5.5.0] — 2026-10-20
 
 The last 5.x minor with a change of its own: the line refuses EF Core 11, whose successor is `CodoMetis.EFCore.SchemaKit`.