diff --git a/CHANGELOG.md b/CHANGELOG.md
index 381a5ea..23bfd47 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,10 @@
 # bedrock-ssm-mongodb ChangeLog
 
+## 12.1.1 - 2025-mm-dd
+
+### Fixed
+- Remove unused `background` option from mongodb index creation.
+
 ## 12.1.0 - 2025-02-04
 
 ### Added
diff --git a/lib/index.js b/lib/index.js
index 77ff554..f5de96c 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -49,7 +49,7 @@ bedrock.events.on('bedrock-mongodb.ready', async () => {
     // cover queries by ID (<keystoreId>/<localId>)
     collection: 'ssm',
     fields: {keystoreId: 1, localId: 1},
-    options: {unique: true, background: false}
+    options: {unique: true}
   }]);
 });