diff --git a/codegen/smithy-aws-swift-codegen/src/main/kotlin/software/amazon/smithy/aws/swift/codegen/protocols/awsjson/AWSJSON1_0ProtocolGenerator.kt b/codegen/smithy-aws-swift-codegen/src/main/kotlin/software/amazon/smithy/aws/swift/codegen/protocols/awsjson/AWSJSON1_0ProtocolGenerator.kt
index 5ff59ae248f..39385604ccf 100644
--- a/codegen/smithy-aws-swift-codegen/src/main/kotlin/software/amazon/smithy/aws/swift/codegen/protocols/awsjson/AWSJSON1_0ProtocolGenerator.kt
+++ b/codegen/smithy-aws-swift-codegen/src/main/kotlin/software/amazon/smithy/aws/swift/codegen/protocols/awsjson/AWSJSON1_0ProtocolGenerator.kt
@@ -22,6 +22,8 @@ class AWSJSON1_0ProtocolGenerator : AWSHTTPBindingProtocolGenerator(AWSJSONCusto
     override val protocolTestsToIgnore = setOf(
         "SDKAppliedContentEncoding_awsJson1_0",
         "SDKAppendsGzipAndIgnoresHttpProvidedEncoding_awsJson1_0",
+        "AwsJson10ClientPopulatesDefaultValuesInInput", // TODO: broken in Smithy 1.53.0
+        "AwsJson10ClientPopulatesDefaultsValuesWhenMissingInResponse", // TODO: broken in Smithy 1.53.0
     )
     override fun getProtocolHttpBindingResolver(ctx: ProtocolGenerator.GenerationContext, defaultContentType: String):
         HttpBindingResolver = AWSJSONHttpBindingResolver(ctx, defaultContentType)
diff --git a/codegen/smithy-aws-swift-codegen/src/main/kotlin/software/amazon/smithy/aws/swift/codegen/protocols/restjson/AWSRestJson1ProtocolGenerator.kt b/codegen/smithy-aws-swift-codegen/src/main/kotlin/software/amazon/smithy/aws/swift/codegen/protocols/restjson/AWSRestJson1ProtocolGenerator.kt
index 4fff69196fd..f3d7a9ad267 100644
--- a/codegen/smithy-aws-swift-codegen/src/main/kotlin/software/amazon/smithy/aws/swift/codegen/protocols/restjson/AWSRestJson1ProtocolGenerator.kt
+++ b/codegen/smithy-aws-swift-codegen/src/main/kotlin/software/amazon/smithy/aws/swift/codegen/protocols/restjson/AWSRestJson1ProtocolGenerator.kt
@@ -14,5 +14,7 @@ class AWSRestJson1ProtocolGenerator : AWSHTTPBindingProtocolGenerator(RestJSONCu
     override val protocolTestsToIgnore = setOf(
         "SDKAppliedContentEncoding_restJson1",
         "SDKAppendedGzipAfterProvidedEncoding_restJson1",
+        "RestJsonClientPopulatesDefaultValuesInInput", // TODO: broken in Smithy 1.53.0
+        "RestJsonClientPopulatesDefaultsValuesWhenMissingInResponse", // TODO: broken in Smithy 1.53.0
     )
 }