diff --git a/IntegrationTests/Services/AWSCognitoIdentityIntegrationTests/UnauthenticatedAPITests.swift b/IntegrationTests/Services/AWSCognitoIdentityIntegrationTests/UnauthenticatedAPITests.swift
index 5b08113d537..d694342414b 100644
--- a/IntegrationTests/Services/AWSCognitoIdentityIntegrationTests/UnauthenticatedAPITests.swift
+++ b/IntegrationTests/Services/AWSCognitoIdentityIntegrationTests/UnauthenticatedAPITests.swift
@@ -32,8 +32,10 @@ class UnauthenticatedAPITests: XCTestCase {
         cognitoIdentityClient = try CognitoIdentityClient(region: region)
 
         // CognitoIdentity client for calling unauthenticated API against an identity pool.
-        let config = try await CognitoIdentityClient.CognitoIdentityClientConfiguration(region: region)
-        config.addInterceptorProvider(GetHeadersBeforeTransmitProvider())
+        let config = try await CognitoIdentityClient.Config(
+            region: region,
+            httpInterceptorProviders: [GetHeadersBeforeTransmitProvider()]
+        )
         cognitoIdentityUnauthenticatedCheckClient = CognitoIdentityClient(config: config)
 
         // Create identity pool & save its identity pool ID
diff --git a/IntegrationTests/Services/AWSS3IntegrationTests/S3FlexibleChecksumsTests.swift b/IntegrationTests/Services/AWSS3IntegrationTests/S3FlexibleChecksumsTests.swift
index aca7dcb6d02..0ba01ae7b7a 100644
--- a/IntegrationTests/Services/AWSS3IntegrationTests/S3FlexibleChecksumsTests.swift
+++ b/IntegrationTests/Services/AWSS3IntegrationTests/S3FlexibleChecksumsTests.swift
@@ -114,8 +114,10 @@ final class S3FlexibleChecksumsTests: S3XCTestCase {
     }
 
     func test_putGetObject_streamining_unsigned_chunked() async throws {
-        let config = try await S3Client.S3ClientConfiguration(region: region)
-        config.addInterceptorProvider(DisablePayloadSigningProvider())
+        let config = try await S3Client.S3ClientConfiguration(
+            region: region,
+            httpInterceptorProviders: [DisablePayloadSigningProvider()]
+        )
         let customizedClient = S3Client(config: config)
 
         let bufferedStream = BufferedStream(data: originalData, isClosed: true)
diff --git a/IntegrationTests/Services/AWSS3IntegrationTests/S3ToggleUnsignedPayloadTests.swift b/IntegrationTests/Services/AWSS3IntegrationTests/S3ToggleUnsignedPayloadTests.swift
index 5fb4dd680eb..a14b76ecbcb 100644
--- a/IntegrationTests/Services/AWSS3IntegrationTests/S3ToggleUnsignedPayloadTests.swift
+++ b/IntegrationTests/Services/AWSS3IntegrationTests/S3ToggleUnsignedPayloadTests.swift
@@ -16,13 +16,6 @@ import class SmithyStreams.BufferedStream
 
 /// Tests toggle unsigned payload using S3.
 class S3ToggleUnsignedPayloadTests: S3XCTestCase {
-    private var s3Config: S3Client.S3ClientConfiguration!
-
-    override func setUp() async throws {
-        try await super.setUp()
-        s3Config = try await S3Client.S3ClientConfiguration(region: region)
-        s3Config.authSchemes = [SigV4AuthScheme(requestUnsignedBody: true)]
-    }
 
     class CheckUnsignedPayloadHeader<InputType, OutputType>: Interceptor {
         typealias RequestType = HTTPRequest
@@ -68,7 +61,11 @@ class S3ToggleUnsignedPayloadTests: S3XCTestCase {
         )
 
         // Upload
-        s3Config.addInterceptorProvider(CheckUnsignedPayloadHeaderProvider())
+        let s3Config = try await S3Client.S3ClientConfiguration(
+            region: region,
+            authSchemes: [SigV4AuthScheme(requestUnsignedBody: true)],
+            httpInterceptorProviders: [CheckUnsignedPayloadHeaderProvider()]
+        )
         let s3Client = S3Client(config: s3Config)
         _ = try await s3Client.putObject(input: putObjectInput)
 
@@ -93,7 +90,11 @@ class S3ToggleUnsignedPayloadTests: S3XCTestCase {
         )
 
         // Upload
-        s3Config.addInterceptorProvider(CheckStreamingUnsignedPayloadHeaderProvider())
+        let s3Config = try await S3Client.S3ClientConfiguration(
+            region: region,
+            authSchemes: [SigV4AuthScheme(requestUnsignedBody: true)],
+            httpInterceptorProviders: [CheckStreamingUnsignedPayloadHeaderProvider()]
+        )
         let s3Client = S3Client(config: s3Config)
         _ = try await s3Client.putObject(input: putObjectInput)
 
diff --git a/IntegrationTests/Services/AWSS3IntegrationTests/SigV4ASigningRegionTest.swift b/IntegrationTests/Services/AWSS3IntegrationTests/SigV4ASigningRegionTest.swift
index c3c5b8702ab..11dd921de3b 100644
--- a/IntegrationTests/Services/AWSS3IntegrationTests/SigV4ASigningRegionTest.swift
+++ b/IntegrationTests/Services/AWSS3IntegrationTests/SigV4ASigningRegionTest.swift
@@ -20,10 +20,12 @@ class SigV4ASigningRegionTest: XCTestCase {
     private var sigv4aConfig: S3Client.S3ClientConfiguration!
 
     override func setUp() async throws {
-        sigv4aConfig = try await S3Client.S3ClientConfiguration(region: "dummy-region")
-        sigv4aConfig.authSchemes = [SigV4AAuthScheme()]
-        sigv4aConfig.httpClientEngine = ProtocolTestClient() // Mock HTTP client that doesn't actually send a request
-        sigv4aConfig.addInterceptorProvider(SigningRegionAssertInterceptorProvider())
+        sigv4aConfig = try await S3Client.Config(
+            region: "dummy-region",
+            httpClientEngine: ProtocolTestClient(),
+            authSchemes: [SigV4AAuthScheme()],
+            httpInterceptorProviders: [SigningRegionAssertInterceptorProvider()]
+        )
         sigv4aClient = S3Client(config: sigv4aConfig)
     }
 
diff --git a/codegen/smithy-aws-swift-codegen/src/test/kotlin/software/amazon/smithy/aws/swift/codegen/awsrestjson/AWSRestJson1ProtocolGeneratorTests.kt b/codegen/smithy-aws-swift-codegen/src/test/kotlin/software/amazon/smithy/aws/swift/codegen/awsrestjson/AWSRestJson1ProtocolGeneratorTests.kt
index 4448c3c1056..311f1ebad28 100644
--- a/codegen/smithy-aws-swift-codegen/src/test/kotlin/software/amazon/smithy/aws/swift/codegen/awsrestjson/AWSRestJson1ProtocolGeneratorTests.kt
+++ b/codegen/smithy-aws-swift-codegen/src/test/kotlin/software/amazon/smithy/aws/swift/codegen/awsrestjson/AWSRestJson1ProtocolGeneratorTests.kt
@@ -334,14 +334,6 @@ extension ExampleClient {
             return "\(ExampleClient.clientName) - \(region ?? "")"
         }
 
-        public func addInterceptorProvider(_ provider: ClientRuntime.InterceptorProvider) {
-            self.interceptorProviders.append(provider)
-        }
-
-        public func addInterceptorProvider(_ provider: ClientRuntime.HttpInterceptorProvider) {
-            self.httpInterceptorProviders.append(provider)
-        }
-
     }
 
     public static func builder() -> ClientRuntime.ClientBuilder<ExampleClient> {