diff --git a/.changes/220eb2c9-2f5b-4ebb-bc30-901bdedc1a4c.json b/.changes/220eb2c9-2f5b-4ebb-bc30-901bdedc1a4c.json
new file mode 100644
index 00000000000..38a51e06339
--- /dev/null
+++ b/.changes/220eb2c9-2f5b-4ebb-bc30-901bdedc1a4c.json
@@ -0,0 +1,5 @@
+{
+    "id": "220eb2c9-2f5b-4ebb-bc30-901bdedc1a4c",
+    "type": "bugfix",
+    "description": "⚠️ **IMPORTANT**: Update to the latest S3 model, which correctly models `ReplicationRuleFilter` and `LifecycleRuleFilter` as structures (not unions). This may cause compilation failures in existing code which references these two shapes."
+}
diff --git a/codegen/sdk/aws-models/s3.json b/codegen/sdk/aws-models/s3.json
index 3b02edc71dd..fc155a8427a 100644
--- a/codegen/sdk/aws-models/s3.json
+++ b/codegen/sdk/aws-models/s3.json
@@ -26084,7 +26084,7 @@
             }
         },
         "com.amazonaws.s3#LifecycleRuleFilter": {
-            "type": "union",
+            "type": "structure",
             "members": {
                 "Prefix": {
                     "target": "com.amazonaws.s3#Prefix",
@@ -32311,7 +32311,7 @@
             }
         },
         "com.amazonaws.s3#ReplicationRuleFilter": {
-            "type": "union",
+            "type": "structure",
             "members": {
                 "Prefix": {
                     "target": "com.amazonaws.s3#Prefix",
diff --git a/services/s3/e2eTest/src/MutliRegionAccessPointTest.kt b/services/s3/e2eTest/src/MutliRegionAccessPointTest.kt
index 9c3cb087fa6..49630763536 100644
--- a/services/s3/e2eTest/src/MutliRegionAccessPointTest.kt
+++ b/services/s3/e2eTest/src/MutliRegionAccessPointTest.kt
@@ -8,8 +8,8 @@ import aws.sdk.kotlin.e2etest.S3TestUtils.createMultiRegionAccessPoint
 import aws.sdk.kotlin.e2etest.S3TestUtils.deleteBucketAndAllContents
 import aws.sdk.kotlin.e2etest.S3TestUtils.deleteMultiRegionAccessPoint
 import aws.sdk.kotlin.e2etest.S3TestUtils.getAccountId
+import aws.sdk.kotlin.e2etest.S3TestUtils.getBucketWithPrefix
 import aws.sdk.kotlin.e2etest.S3TestUtils.getMultiRegionAccessPointArn
-import aws.sdk.kotlin.e2etest.S3TestUtils.getTestBucket
 import aws.sdk.kotlin.e2etest.S3TestUtils.multiRegionAccessPointWasCreated
 import aws.sdk.kotlin.services.s3.S3Client
 import aws.sdk.kotlin.services.s3.deleteObject
@@ -27,6 +27,8 @@ import kotlin.test.Test
 import kotlin.test.assertEquals
 import kotlin.test.assertFailsWith
 
+private const val MRAP_BUCKET_PREFIX = "s3-mrap-test-bucket-"
+
 @TestInstance(TestInstance.Lifecycle.PER_CLASS)
 class MutliRegionAccessPointTest {
     private val s3West = S3Client { region = "us-west-2" }
@@ -45,8 +47,8 @@ class MutliRegionAccessPointTest {
     @BeforeAll
     private fun setUp(): Unit = runBlocking {
         accountId = getAccountId()
-        usWestBucket = getTestBucket(s3West, "us-west-2", accountId)
-        usEastBucket = getTestBucket(s3East, "us-east-2", accountId)
+        usWestBucket = getBucketWithPrefix(s3West, MRAP_BUCKET_PREFIX, "us-west-2", accountId)
+        usEastBucket = getBucketWithPrefix(s3East, MRAP_BUCKET_PREFIX, "us-east-2", accountId)
 
         createMultiRegionAccessPoint(
             s3Control,
diff --git a/services/s3/e2eTest/src/S3TestUtils.kt b/services/s3/e2eTest/src/S3TestUtils.kt
index 91f8b846261..6247ac2f129 100644
--- a/services/s3/e2eTest/src/S3TestUtils.kt
+++ b/services/s3/e2eTest/src/S3TestUtils.kt
@@ -10,7 +10,6 @@ import aws.sdk.kotlin.services.s3.model.*
 import aws.sdk.kotlin.services.s3.model.BucketLocationConstraint
 import aws.sdk.kotlin.services.s3.model.ExpirationStatus
 import aws.sdk.kotlin.services.s3.model.LifecycleRule
-import aws.sdk.kotlin.services.s3.model.LifecycleRuleFilter
 import aws.sdk.kotlin.services.s3.paginators.listObjectsV2Paginated
 import aws.sdk.kotlin.services.s3.waiters.waitUntilBucketExists
 import aws.sdk.kotlin.services.s3.waiters.waitUntilBucketNotExists
@@ -46,11 +45,11 @@ object S3TestUtils {
         accountId: String? = null,
     ): String = getBucketWithPrefix(client, TEST_BUCKET_PREFIX, region, accountId)
 
-    private suspend fun getBucketWithPrefix(
+    suspend fun getBucketWithPrefix(
         client: S3Client,
         prefix: String,
-        region: String?,
-        accountId: String?,
+        region: String? = null,
+        accountId: String? = null,
     ): String = withTimeout(60.seconds) {
         val buckets = client.listBuckets()
             .buckets
@@ -88,7 +87,7 @@ object S3TestUtils {
                 rules = listOf(
                     LifecycleRule {
                         expiration { days = 1 }
-                        filter = LifecycleRuleFilter.Prefix("")
+                        filter { this.prefix = "" }
                         status = ExpirationStatus.Enabled
                         id = "delete-old"
                     },