diff --git a/codegen/smithy-aws-kotlin-codegen/build.gradle.kts b/codegen/smithy-aws-kotlin-codegen/build.gradle.kts
index 0f1f4329223..2b91d0b6b9e 100644
--- a/codegen/smithy-aws-kotlin-codegen/build.gradle.kts
+++ b/codegen/smithy-aws-kotlin-codegen/build.gradle.kts
@@ -31,7 +31,7 @@ dependencies {
     api("software.amazon.smithy:smithy-aws-iam-traits:$smithyVersion")
     api("software.amazon.smithy:smithy-aws-cloudformation-traits:$smithyVersion")
     api("software.amazon.smithy:smithy-protocol-test-traits:$smithyVersion")
-    implementation("software.amazon.smithy:smithy-rules-engine:$smithyVersion")
+    implementation("software.amazon.smithy:smithy-aws-endpoints:$smithyVersion")
 
     testImplementation("org.junit.jupiter:junit-jupiter:$junitVersion")
     testImplementation("org.junit.jupiter:junit-jupiter-params:$junitVersion")
diff --git a/codegen/smithy-aws-kotlin-codegen/src/main/kotlin/aws/sdk/kotlin/codegen/AwsEndpointDelegator.kt b/codegen/smithy-aws-kotlin-codegen/src/main/kotlin/aws/sdk/kotlin/codegen/AwsEndpointDelegator.kt
index 47a98539faf..b444b723b6d 100644
--- a/codegen/smithy-aws-kotlin-codegen/src/main/kotlin/aws/sdk/kotlin/codegen/AwsEndpointDelegator.kt
+++ b/codegen/smithy-aws-kotlin-codegen/src/main/kotlin/aws/sdk/kotlin/codegen/AwsEndpointDelegator.kt
@@ -56,6 +56,7 @@ class AwsEndpointDelegator : EndpointDelegator {
                 },
             )
         }
+
         if (rules != null) {
             ctx.delegator.useFileWriter(defaultProviderSymbol) {
                 DefaultEndpointProviderGenerator(it, rules, defaultProviderSymbol, providerSymbol, paramsSymbol, ctx.settings, endpointFunctions, awsEndpointPropertyRenderers).render()
diff --git a/codegen/smithy-aws-kotlin-codegen/src/main/kotlin/aws/sdk/kotlin/codegen/protocols/core/AwsHttpBindingProtocolGenerator.kt b/codegen/smithy-aws-kotlin-codegen/src/main/kotlin/aws/sdk/kotlin/codegen/protocols/core/AwsHttpBindingProtocolGenerator.kt
index fd7cc8afdca..7d746e0c099 100644
--- a/codegen/smithy-aws-kotlin-codegen/src/main/kotlin/aws/sdk/kotlin/codegen/protocols/core/AwsHttpBindingProtocolGenerator.kt
+++ b/codegen/smithy-aws-kotlin-codegen/src/main/kotlin/aws/sdk/kotlin/codegen/protocols/core/AwsHttpBindingProtocolGenerator.kt
@@ -52,6 +52,30 @@ abstract class AwsHttpBindingProtocolGenerator : HttpBindingProtocolGenerator()
     }
 
     override fun generateProtocolUnitTests(ctx: ProtocolGenerator.GenerationContext) {
+        val ignoredTests = TestMemberDelta(
+            setOf(
+                // FIXME - compression not yet supported, see https://github.com/awslabs/smithy-kotlin/issues/955
+                "SDKAppliedContentEncoding_awsJson1_0",
+                "SDKAppliedContentEncoding_awsJson1_1",
+                "SDKAppliedContentEncoding_awsQuery",
+                "SDKAppliedContentEncoding_ec2Query",
+                "SDKAppliedContentEncoding_restJson1",
+                "SDKAppliedContentEncoding_restXml",
+                "SDKAppendedGzipAfterProvidedEncoding_restJson1",
+                "SDKAppendedGzipAfterProvidedEncoding_restXml",
+                "SDKAppendsGzipAndIgnoresHttpProvidedEncoding_awsJson1_0",
+                "SDKAppendsGzipAndIgnoresHttpProvidedEncoding_awsJson1_1",
+                "SDKAppendsGzipAndIgnoresHttpProvidedEncoding_awsQuery",
+                "SDKAppendsGzipAndIgnoresHttpProvidedEncoding_ec2Query",
+
+                // FIXME - missing Content-Type on restXml empty payloads, see https://github.com/awslabs/aws-sdk-kotlin/issues/1050
+                "RestXmlHttpPayloadWithUnsetUnion",
+
+                // FIXME - xmlns incorrect in XML maps, see https://github.com/awslabs/smithy-kotlin/issues/957
+                "RestXmlXmlMapWithXmlNamespace",
+            ),
+        )
+
         // The following can be used to generate only a specific test by name.
         // val targetedTest = TestMemberDelta(setOf("RestJsonComplexErrorWithNoMessage"), TestContainmentMode.RUN_TESTS)
 
@@ -64,6 +88,7 @@ abstract class AwsHttpBindingProtocolGenerator : HttpBindingProtocolGenerator()
             requestTestBuilder,
             responseTestBuilder,
             errorTestBuilder,
+            ignoredTests,
         ).generateProtocolTests()
     }
 
diff --git a/codegen/smithy-aws-kotlin-codegen/src/main/kotlin/aws/sdk/kotlin/codegen/protocols/endpoints/DefaultEndpointProviderExt.kt b/codegen/smithy-aws-kotlin-codegen/src/main/kotlin/aws/sdk/kotlin/codegen/protocols/endpoints/DefaultEndpointProviderExt.kt
index 0b92246eb7a..5b323cec92f 100644
--- a/codegen/smithy-aws-kotlin-codegen/src/main/kotlin/aws/sdk/kotlin/codegen/protocols/endpoints/DefaultEndpointProviderExt.kt
+++ b/codegen/smithy-aws-kotlin-codegen/src/main/kotlin/aws/sdk/kotlin/codegen/protocols/endpoints/DefaultEndpointProviderExt.kt
@@ -12,7 +12,7 @@ import software.amazon.smithy.kotlin.codegen.rendering.endpoints.ExpressionRende
 import software.amazon.smithy.kotlin.codegen.utils.getOrNull
 import software.amazon.smithy.model.node.Node
 import software.amazon.smithy.model.node.ObjectNode
-import software.amazon.smithy.rulesengine.language.syntax.expr.Expression
+import software.amazon.smithy.rulesengine.language.syntax.expressions.Expression
 import java.util.*
 
 val awsEndpointFunctions = mapOf(
@@ -24,9 +24,6 @@ val awsEndpointPropertyRenderers = mapOf(
     "authSchemes" to ::renderAuthSchemes,
 )
 
-// valid auth scheme names that can appear in a smithy endpoint's properties
-private val validAuthSchemeNames = setOf("sigv4", "sigv4a")
-
 private fun String.toSigningContextClassName(): String? =
     when (this) {
         "sigv4" -> "SigV4"
diff --git a/gradle.properties b/gradle.properties
index d5998cbcd31..9e402be5fee 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -9,10 +9,10 @@ org.gradle.jvmargs=-Xmx6g -XX:MaxMetaspaceSize=2G
 sdkVersion=0.32.3-SNAPSHOT
 
 # codegen
-smithyVersion=1.29.0
+smithyVersion=1.39.0
 smithyGradleVersion=0.6.0
 # smithy-kotlin codegen and runtime are versioned together
-smithyKotlinVersion=0.27.4
+smithyKotlinVersion=0.27.5-SNAPSHOT
 
 # kotlin
 kotlinVersion=1.8.22
@@ -37,4 +37,4 @@ mockkVersion=1.13.3
 slf4jVersion=2.0.6
 
 # dokka config (values specified at build-time as needed)
-smithyKotlinDocBaseUrl=https://sdk.amazonaws.com/kotlin/api/smithy-kotlin/api/$smithyKotlinVersion/
\ No newline at end of file
+smithyKotlinDocBaseUrl=https://sdk.amazonaws.com/kotlin/api/smithy-kotlin/api/$smithyKotlinVersion/
diff --git a/gradle/sdk-plugins/build.gradle.kts b/gradle/sdk-plugins/build.gradle.kts
index aba275ecd37..28b19e29c8e 100644
--- a/gradle/sdk-plugins/build.gradle.kts
+++ b/gradle/sdk-plugins/build.gradle.kts
@@ -5,6 +5,7 @@
 import java.util.Properties
 buildscript {
     repositories {
+        mavenLocal()
         mavenCentral()
     }
 }
@@ -15,6 +16,7 @@ plugins {
 }
 
 repositories {
+    mavenLocal()
     mavenCentral()
     gradlePluginPortal()
 }
diff --git a/settings.gradle.kts b/settings.gradle.kts
index aa3248c2f6a..23351a8a2a8 100644
--- a/settings.gradle.kts
+++ b/settings.gradle.kts
@@ -5,6 +5,7 @@
 
 pluginManagement {
     repositories {
+        mavenLocal()
         mavenCentral()
         gradlePluginPortal()
     }