diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9b8143c..4de4c6b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,11 @@ The envelope wire format is versioned separately by `meta.schema_version`
 
 ## [Unreleased]
 
+## [1.2.1] - 2026-10-03
+
+### Changed
+- Raise the `AWSSDK.SQS` floor from 4.0.3.3 to 4.0.100.15. No API or behaviour change.
+
 ## [1.2.0] - 2026-10-03
 
 MINOR: new public options and a changed failure-path behaviour (see below); no existing
@@ -82,7 +87,8 @@ signature changed.
   with a Moq-mocked `IAmazonSQS` (no AWS, no network). The envelope is unchanged
   (`schema_version: 1`); SQS is purely additive.
 
-[Unreleased]: https://github.com/BabelQueue/babelqueue-dotnet-sqs/compare/v1.2.0...HEAD
+[Unreleased]: https://github.com/BabelQueue/babelqueue-dotnet-sqs/compare/v1.2.1...HEAD
+[1.2.1]: https://github.com/BabelQueue/babelqueue-dotnet-sqs/compare/v1.2.0...v1.2.1
 [1.2.0]: https://github.com/BabelQueue/babelqueue-dotnet-sqs/compare/v1.1.0...v1.2.0
 [1.1.0]: https://github.com/BabelQueue/babelqueue-dotnet-sqs/compare/v1.0.0...v1.1.0
 [1.0.0]: https://github.com/BabelQueue/babelqueue-dotnet-sqs/releases/tag/v1.0.0
diff --git a/src/BabelQueue.Sqs/BabelQueue.Sqs.csproj b/src/BabelQueue.Sqs/BabelQueue.Sqs.csproj
index 624368a..528b620 100644
--- a/src/BabelQueue.Sqs/BabelQueue.Sqs.csproj
+++ b/src/BabelQueue.Sqs/BabelQueue.Sqs.csproj
@@ -16,7 +16,7 @@
 
     <!-- NuGet package metadata -->
     <PackageId>BabelQueue.Sqs</PackageId>
-    <Version>1.2.0</Version>
+    <Version>1.2.1</Version>
     <Authors>Muhammet Şafak</Authors>
     <Company>BabelQueue</Company>
     <Description>Amazon SQS transport for BabelQueue — a canonical-envelope publisher and a URN-routed consumer over the AWS SDK for .NET, on the framework-agnostic core.</Description>