diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,5 +1,9 @@
 # Changelog for persistent-mongoDB
 
+## 2.13.1.0
+
+* Restore update write concern behavior with MongoDB Driver for MongoDB >= 6.0 [#1550](https://github.com/yesodweb/persistent/pull/1550)
+
 ## 2.13.0.2
 
 * Fix behavioral compatibility with MongoDB Driver for MongoDB >= 6.0 [#1545](https://github.com/yesodweb/persistent/pull/1545)
diff --git a/Database/Persist/MongoDB.hs b/Database/Persist/MongoDB.hs
--- a/Database/Persist/MongoDB.hs
+++ b/Database/Persist/MongoDB.hs
@@ -371,10 +371,6 @@
            => Key record -> DB.Query
 queryByKey k = (DB.select (keyToMongoDoc k) (collectionNameFromKey k)) {DB.project = projectionFromKey k}
 
-selectByKey :: (PersistEntity record, PersistEntityBackend record ~ DB.MongoContext)
-            => Key record -> DB.Selection
-selectByKey k = DB.select (keyToMongoDoc k) (collectionNameFromKey k)
-
 updatesToDoc :: (PersistEntity record, PersistEntityBackend record ~ DB.MongoContext)
              => [Update record] -> DB.Document
 updatesToDoc upds = map updateToMongoField upds
@@ -554,12 +550,16 @@
     insertKey k record = DB.insert_ (collectionName record) $
                          entityToInsertDoc (Entity k record)
 
-    repsert   k record = DB.save (collectionName record) $
-                         documentFromEntity (Entity k record)
+    repsert k record =
+        void $ DB.updateMany
+          (collectionName record)
+          [(keyToMongoDoc k, documentFromEntity (Entity k record), [DB.Upsert])]
 
-    replace k record = do
-        DB.replace (selectByKey k) (recordToDocument record)
-        return ()
+    replace k record =
+        -- replace a single matching document
+        void $ DB.updateMany
+          (collectionNameFromKey k)
+          [(keyToMongoDoc k, recordToDocument record, [])]
 
     delete k =
         void $ DB.deleteMany
diff --git a/persistent-mongoDB.cabal b/persistent-mongoDB.cabal
--- a/persistent-mongoDB.cabal
+++ b/persistent-mongoDB.cabal
@@ -1,5 +1,5 @@
 name:            persistent-mongoDB
-version:         2.13.0.2
+version:         2.13.1.0
 license:         MIT
 license-file:    LICENSE
 author:          Greg Weber <greg@gregweber.info>
