diff --git a/codegen-core/src/main/kotlin/software/amazon/smithy/rust/codegen/core/smithy/protocols/serialize/Ec2QuerySerializerGenerator.kt b/codegen-core/src/main/kotlin/software/amazon/smithy/rust/codegen/core/smithy/protocols/serialize/Ec2QuerySerializerGenerator.kt
index ed3a83c667..e3514c2aba 100644
--- a/codegen-core/src/main/kotlin/software/amazon/smithy/rust/codegen/core/smithy/protocols/serialize/Ec2QuerySerializerGenerator.kt
+++ b/codegen-core/src/main/kotlin/software/amazon/smithy/rust/codegen/core/smithy/protocols/serialize/Ec2QuerySerializerGenerator.kt
@@ -6,10 +6,13 @@
 package software.amazon.smithy.rust.codegen.core.smithy.protocols.serialize
 
 import software.amazon.smithy.aws.traits.protocols.Ec2QueryNameTrait
+import software.amazon.smithy.model.shapes.CollectionShape
 import software.amazon.smithy.model.shapes.MemberShape
 import software.amazon.smithy.model.shapes.OperationShape
 import software.amazon.smithy.model.shapes.ShapeId
 import software.amazon.smithy.model.traits.XmlNameTrait
+import software.amazon.smithy.rust.codegen.core.rustlang.RustWriter
+import software.amazon.smithy.rust.codegen.core.rustlang.rustBlock
 import software.amazon.smithy.rust.codegen.core.smithy.CodegenContext
 import software.amazon.smithy.rust.codegen.core.smithy.RuntimeType
 import software.amazon.smithy.rust.codegen.core.util.getTrait
@@ -32,4 +35,13 @@ class Ec2QuerySerializerGenerator(codegenContext: CodegenContext) : QuerySeriali
     override fun serverErrorSerializer(shape: ShapeId): RuntimeType {
         TODO("Not yet implemented")
     }
+
+    override fun RustWriter.serializeCollection(
+        memberContext: MemberContext,
+        context: Context<CollectionShape>,
+    ) {
+        rustBlock("if !${context.valueExpression.asRef()}.is_empty()") {
+            super.serializeCollectionInner(memberContext, context, this)
+        }
+    }
 }
diff --git a/codegen-core/src/main/kotlin/software/amazon/smithy/rust/codegen/core/smithy/protocols/serialize/QuerySerializerGenerator.kt b/codegen-core/src/main/kotlin/software/amazon/smithy/rust/codegen/core/smithy/protocols/serialize/QuerySerializerGenerator.kt
index b47e5dd98c..a38581e6b6 100644
--- a/codegen-core/src/main/kotlin/software/amazon/smithy/rust/codegen/core/smithy/protocols/serialize/QuerySerializerGenerator.kt
+++ b/codegen-core/src/main/kotlin/software/amazon/smithy/rust/codegen/core/smithy/protocols/serialize/QuerySerializerGenerator.kt
@@ -282,30 +282,40 @@ abstract class QuerySerializerGenerator(private val codegenContext: CodegenConte
         }
     }
 
-    private fun RustWriter.serializeCollection(
+    protected open fun RustWriter.serializeCollection(
         memberContext: MemberContext,
         context: Context<CollectionShape>,
     ) {
-        val flat = memberContext.shape.isFlattened()
-        val memberOverride =
-            when (val override = context.shape.member.getTrait<XmlNameTrait>()?.value) {
-                null -> "None"
-                else -> "Some(${override.dq()})"
-            }
-        val itemName = safeName("item")
-        safeName("list").also { listName ->
-            rust("let mut $listName = ${context.writerExpression}.start_list($flat, $memberOverride);")
-            rustBlock("for $itemName in ${context.valueExpression.asRef()}") {
-                val entryName = safeName("entry")
-                Attribute.AllowUnusedMut.render(this)
-                rust("let mut $entryName = $listName.entry();")
-                val targetShape = model.expectShape(context.shape.member.target)
-                serializeMemberValue(
-                    MemberContext(entryName, ValueExpression.Reference(itemName), context.shape.member),
-                    targetShape,
-                )
+        serializeCollectionInner(memberContext, context, this)
+    }
+
+    protected fun serializeCollectionInner(
+        memberContext: MemberContext,
+        context: Context<CollectionShape>,
+        writer: RustWriter,
+    ) {
+        writer.apply {
+            val flat = memberContext.shape.isFlattened()
+            val memberOverride =
+                when (val override = context.shape.member.getTrait<XmlNameTrait>()?.value) {
+                    null -> "None"
+                    else -> "Some(${override.dq()})"
+                }
+            val itemName = safeName("item")
+            safeName("list").also { listName ->
+                rust("let mut $listName = ${context.writerExpression}.start_list($flat, $memberOverride);")
+                rustBlock("for $itemName in ${context.valueExpression.asRef()}") {
+                    val entryName = safeName("entry")
+                    Attribute.AllowUnusedMut.render(this)
+                    rust("let mut $entryName = $listName.entry();")
+                    val targetShape = model.expectShape(context.shape.member.target)
+                    serializeMemberValue(
+                        MemberContext(entryName, ValueExpression.Reference(itemName), context.shape.member),
+                        targetShape,
+                    )
+                }
+                rust("$listName.finish();")
             }
-            rust("$listName.finish();")
         }
     }
 
diff --git a/gradle.properties b/gradle.properties
index e33333a351..6d06ec08dc 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -21,7 +21,7 @@ kotlin.code.style=official
 
 # codegen
 smithyGradlePluginVersion=0.9.0
-smithyVersion=1.47.0
+smithyVersion=1.49.0
 allowLocalDeps=false
 
 # kotlin