diff --git a/CHANGELOG.md b/CHANGELOG.md
index bfbac8db..a79c909e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,16 @@
 <!-- markdownlint-disable single-title -->
 # v2.0.0 (Unreleased)
 
+# v2.0.0-beta.66 (2025-09-02)
+
+ENHANCEMENTS
+
+* Adds support for additional AWS region ([#1347](https://github.com/hashicorp/aws-sdk-go-base/pull/1347))
+
+BUG FIXES
+
+* Updates dependencies.
+
 # v2.0.0-beta.65 (2025-06-06)
 
 ENHANCEMENTS
diff --git a/v2/awsv1shim/go.mod b/v2/awsv1shim/go.mod
index 309902fc..5f3d9167 100644
--- a/v2/awsv1shim/go.mod
+++ b/v2/awsv1shim/go.mod
@@ -10,7 +10,7 @@ require (
 	github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.18.6
 	github.com/aws/aws-sdk-go-v2/service/sts v1.38.2
 	github.com/google/go-cmp v0.7.0
-	github.com/hashicorp/aws-sdk-go-base/v2 v2.0.0-beta.65
+	github.com/hashicorp/aws-sdk-go-base/v2 v2.0.0-beta.66
 	github.com/hashicorp/go-cleanhttp v0.5.2
 	github.com/hashicorp/terraform-plugin-log v0.9.0
 	go.opentelemetry.io/contrib/instrumentation/github.com/aws/aws-sdk-go-v2/otelaws v0.63.0