diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3f02138..91ba708 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,20 @@
 # dbt_amazon_ads v1.3.0
 
-TBD
+[PR #47](https://github.com/fivetran/dbt_amazon_ads/pull/47) includes the following updates:
+
+## Schema/Data Changes (--full-refresh required after upgrading)
+**2 total changes • 1 possible breaking change**
+
+| Data Model(s) | Change type | Old | New | Notes |
+| ------------- | ----------- | --- | --- | ----- |
+| All models | `source_relation` column (when using a single Amazon Ads schema) | Empty string (`''`) | `<database>.<schema>` |  |
+
+## Feature Updates
+- Introduces the new (recommended) `amazon_ads_sources` variable for more robust union data configuration. The old `amazon_ads_union_schemas` and `amazon_ads_union_databases` variables will still be supported. See the [README](https://github.com/fivetran/dbt_amazon_ads/tree/main#define-database-and-schema-variables) for specific details. 
+
+## Under the Hood
+- Adds the `fivetran_using_source_casing` variable for case-sensitive destination support. When enabled, downstream transformations respect source casing to ensure consistent results. See the [Additional Configurations](https://github.com/fivetran/dbt_amazon_ads/#source-casing-for-case-sensitive-destinations) section of the README for details. 
+- Introduces `fivetran_utils.partition_by_source_relation` to conditionally include `source_relation` in partition clauses only when multiple sources are configured.
 
 # dbt_amazon_ads v1.2.0
 
diff --git a/README.md b/README.md
index 3907c0a..fa2643f 100644
--- a/README.md
+++ b/README.md
@@ -74,7 +74,7 @@ Include the following amazon_ads package version in your `packages.yml` file _if
 ```yaml
 packages:
   - package: fivetran/amazon_ads
-    version: [">=1.2.0", "<1.3.0"] # we recommend using ranges to capture non-breaking changes automatically
+    version: [">=1.3.0", "<1.4.0"] # we recommend using ranges to capture non-breaking changes automatically
 ```
 
 > All required sources and staging models are now bundled into this transformation package. Do not include `fivetran/amazon_ads_source` in your `packages.yml` since this package has been deprecated.
@@ -180,6 +180,14 @@ vars:
     amazon_ads_<default_source_table_name>_identifier: your_table_name 
 ```
 
+#### Source casing for case-sensitive destinations
+By default, the package applies case-insensitive comparisons when resolving `source_relation` values. If your destination is case-sensitive and you want downstream transformations to respect the exact casing of your source database and schema names, set the following variable:
+
+```yml
+vars:
+    fivetran_using_source_casing: true
+```
+
 </details>
 
 ### (Optional) Orchestrate your models with Fivetran Transformations for dbt Core™