diff --git a/core/src/main/scala/caliban/GraphQL.scala b/core/src/main/scala/caliban/GraphQL.scala
index e0ee53303..af12eb32f 100644
--- a/core/src/main/scala/caliban/GraphQL.scala
+++ b/core/src/main/scala/caliban/GraphQL.scala
@@ -11,7 +11,7 @@ import caliban.parsing.{ Parser, SourceMapper, VariablesCoercer }
 import caliban.rendering.DocumentRenderer
 import caliban.schema._
 import caliban.transformers.Transformer
-import caliban.validation.Validator
+import caliban.validation.{ SchemaValidator, Validator }
 import caliban.wrappers.Wrapper
 import caliban.wrappers.Wrapper._
 import zio.stacktracer.TracingImplicits.disableAutoTrace
@@ -32,7 +32,7 @@ trait GraphQL[-R] { self =>
   protected val transformer: Transformer[R]
 
   private[caliban] def validateRootSchema: Either[ValidationError, RootSchema[R]] =
-    Validator.validateSchema(schemaBuilder)
+    SchemaValidator.validateSchema(schemaBuilder)
 
   /**
    * Returns a string that renders the API types into the GraphQL SDL.
diff --git a/core/src/main/scala/caliban/validation/SchemaValidator.scala b/core/src/main/scala/caliban/validation/SchemaValidator.scala
index da0059410..3222cc260 100644
--- a/core/src/main/scala/caliban/validation/SchemaValidator.scala
+++ b/core/src/main/scala/caliban/validation/SchemaValidator.scala
@@ -10,12 +10,7 @@ import caliban.schema.{ RootSchema, RootSchemaBuilder, Types }
 import caliban.validation.Utils.isObjectType
 import caliban.validation.ValidationOps._
 
-/*
- * TODO In the next major version:
- *  1. Make `SchemaValidator` an object and remove inheritance from Validator
- *  2. Make all methods private except `validateSchema` and `validateType`
- */
-private[caliban] trait SchemaValidator {
+private[caliban] object SchemaValidator {
 
   /**
    * Verifies that the given schema is valid. Fails with a [[caliban.CalibanError.ValidationError]] otherwise.
@@ -43,7 +38,7 @@ private[caliban] trait SchemaValidator {
         case _                       => unit
       })
 
-  private[caliban] def validateClashingTypes(types: List[__Type]): Either[ValidationError, Unit] = {
+  private def validateClashingTypes(types: List[__Type]): Either[ValidationError, Unit] = {
     val check = types.groupBy(_.name).collectFirst { case (Some(name), v) if v.size > 1 => (name, v) }
     check match {
       case None                 => unit
@@ -108,7 +103,7 @@ private[caliban] trait SchemaValidator {
     }
   }
 
-  private[caliban] def validateEnum(t: __Type): Either[ValidationError, Unit] =
+  private def validateEnum(t: __Type): Either[ValidationError, Unit] =
     t.allEnumValues match {
       case _ :: _ => unit
       case Nil    =>
@@ -118,7 +113,7 @@ private[caliban] trait SchemaValidator {
         )
     }
 
-  private[caliban] def validateUnion(t: __Type): Either[ValidationError, Unit] =
+  private def validateUnion(t: __Type): Either[ValidationError, Unit] =
     t.possibleTypes match {
       case None | Some(Nil)                           =>
         failValidation(
@@ -134,7 +129,7 @@ private[caliban] trait SchemaValidator {
       case _                                          => unit
     }
 
-  private[caliban] def validateInputObject(t: __Type): Either[ValidationError, Unit] = {
+  private def validateInputObject(t: __Type): Either[ValidationError, Unit] = {
     lazy val inputObjectContext = s"""${if (t._isOneOfInput) "OneOf " else ""}InputObject '${t.name.getOrElse("")}'"""
 
     def noDuplicateInputValueName(
@@ -184,7 +179,7 @@ private[caliban] trait SchemaValidator {
     }
   }
 
-  private[caliban] def validateInputValue(
+  private def validateInputValue(
     inputValue: __InputValue,
     errorContext: => String
   ): Either[ValidationError, Unit] = {
@@ -196,7 +191,7 @@ private[caliban] trait SchemaValidator {
     } yield ()
   }
 
-  private[caliban] def validateInterface(t: __Type): Either[ValidationError, Unit] = {
+  private def validateInterface(t: __Type): Either[ValidationError, Unit] = {
     lazy val interfaceContext = s"Interface '${t.name.getOrElse("")}'"
 
     t.allFields match {
@@ -209,7 +204,7 @@ private[caliban] trait SchemaValidator {
     }
   }
 
-  def validateObject(obj: __Type): Either[ValidationError, Unit] = {
+  private def validateObject(obj: __Type): Either[ValidationError, Unit] = {
     lazy val objectContext = s"Object '${obj.name.getOrElse("")}'"
 
     def validateInterfaceFields(obj: __Type) = {
@@ -315,7 +310,7 @@ private[caliban] trait SchemaValidator {
   private def isListField(field: __Field) =
     field._type.kind == __TypeKind.LIST
 
-  private[caliban] def onlyInputType(`type`: __Type, errorContext: => String): Either[ValidationError, Unit] = {
+  private def onlyInputType(`type`: __Type, errorContext: => String): Either[ValidationError, Unit] = {
     // https://spec.graphql.org/June2018/#IsInputType()
     def isInputType(t: __Type): Either[__Type, Unit] = {
       import __TypeKind._
@@ -336,7 +331,7 @@ private[caliban] trait SchemaValidator {
     }
   }
 
-  private[caliban] def validateFields(fields: List[__Field], context: => String): Either[ValidationError, Unit] =
+  private def validateFields(fields: List[__Field], context: => String): Either[ValidationError, Unit] =
     noDuplicateFieldName(fields, context) *>
       validateAllDiscard(fields) { field =>
         lazy val fieldContext = s"Field '${field.name}' of $context"
@@ -347,14 +342,14 @@ private[caliban] trait SchemaValidator {
         } yield ()
       }
 
-  private[caliban] def noDuplicateFieldName(fields: List[__Field], errorContext: => String) = {
+  private def noDuplicateFieldName(fields: List[__Field], errorContext: => String) = {
     val messageBuilder = (f: __Field) => s"$errorContext has repeated fields: ${f.name}"
     def explanatory    =
       "The field must have a unique name within that Interface type; no two fields may share the same name"
     noDuplicateName[__Field](fields, _.name, messageBuilder, explanatory)
   }
 
-  private[caliban] def onlyOutputType(`type`: __Type, errorContext: => String): Either[ValidationError, Unit] = {
+  private def onlyOutputType(`type`: __Type, errorContext: => String): Either[ValidationError, Unit] = {
     // https://spec.graphql.org/June2018/#IsOutputType()
     def isOutputType(t: __Type): Either[__Type, Unit] = {
       import __TypeKind._
@@ -375,7 +370,7 @@ private[caliban] trait SchemaValidator {
     }
   }
 
-  private[caliban] def noDuplicateName[T](
+  private def noDuplicateName[T](
     listOfNamed: List[T],
     nameExtractor: T => String,
     messageBuilder: T => String,
@@ -388,7 +383,7 @@ private[caliban] trait SchemaValidator {
         failValidation(messageBuilder(duplicate), explanatoryText)
       )
 
-  private[caliban] def checkName(name: String, fieldContext: => String): Either[ValidationError, Unit] =
+  private def checkName(name: String, fieldContext: => String): Either[ValidationError, Unit] =
     Parser
       .parseName(name)
       .left
@@ -399,7 +394,7 @@ private[caliban] trait SchemaValidator {
         )
       ) *> doesNotStartWithUnderscore(name, fieldContext)
 
-  private[caliban] def doesNotStartWithUnderscore(
+  private def doesNotStartWithUnderscore(
     name: String,
     errorContext: => String
   ): Either[ValidationError, Unit] =
@@ -408,7 +403,7 @@ private[caliban] trait SchemaValidator {
       """Names can not begin with the characters "__" (two underscores)"""
     )
 
-  private[caliban] def validateRootQuery[R](
+  private def validateRootQuery[R](
     schema: RootSchemaBuilder[R]
   ): Either[ValidationError, RootSchema[R]] =
     schema.query match {
@@ -427,7 +422,7 @@ private[caliban] trait SchemaValidator {
           )
     }
 
-  private[caliban] def validateRootMutation[R](schema: RootSchemaBuilder[R]): Either[ValidationError, Unit] =
+  private def validateRootMutation[R](schema: RootSchemaBuilder[R]): Either[ValidationError, Unit] =
     schema.mutation match {
       case Some(mutation) if mutation.opType.kind != __TypeKind.OBJECT =>
         failValidation(
@@ -437,7 +432,7 @@ private[caliban] trait SchemaValidator {
       case _                                                           => unit
     }
 
-  private[caliban] def validateRootSubscription[R](schema: RootSchemaBuilder[R]): Either[ValidationError, Unit] =
+  private def validateRootSubscription[R](schema: RootSchemaBuilder[R]): Either[ValidationError, Unit] =
     schema.subscription match {
       case Some(subscription) if subscription.opType.kind != __TypeKind.OBJECT =>
         failValidation(
diff --git a/core/src/main/scala/caliban/validation/Validator.scala b/core/src/main/scala/caliban/validation/Validator.scala
index 2d472e9b2..b19334c14 100644
--- a/core/src/main/scala/caliban/validation/Validator.scala
+++ b/core/src/main/scala/caliban/validation/Validator.scala
@@ -25,7 +25,7 @@ import scala.collection.compat._
 import scala.collection.mutable
 import scala.collection.mutable.ListBuffer
 
-object Validator extends SchemaValidator {
+object Validator {
   import ValidationOps._
   import caliban.syntax._
 
diff --git a/core/src/test/scala/caliban/validation/ValidationSchemaSpec.scala b/core/src/test/scala/caliban/validation/ValidationSchemaSpec.scala
index 5ae7c907c..2a8154296 100644
--- a/core/src/test/scala/caliban/validation/ValidationSchemaSpec.scala
+++ b/core/src/test/scala/caliban/validation/ValidationSchemaSpec.scala
@@ -21,7 +21,7 @@ object ValidationSchemaSpec extends ZIOSpecDefault {
 
   def checkTypeError(t: __Type, expectedMessage: String): IO[ValidationError, TestResult] =
     ZIO
-      .fromEither(Validator.validateType(t))
+      .fromEither(SchemaValidator.validateType(t))
       .exit
       .map(assert(_)(fails(hasField("msg", _.msg, equalTo(expectedMessage)))))
 
@@ -29,7 +29,7 @@ object ValidationSchemaSpec extends ZIOSpecDefault {
     suite("ValidationSchemaSpec")(
       suite("Enum")(
         test("non-empty enum is ok") {
-          val res = Validator.validateType(
+          val res = SchemaValidator.validateType(
             Types.makeEnum(
               name = Some("nonEmptyEnum"),
               description = None,
@@ -54,7 +54,7 @@ object ValidationSchemaSpec extends ZIOSpecDefault {
       ),
       suite("Union")(
         test("union containing object types is ok") {
-          val res = Validator.validateType(
+          val res = SchemaValidator.validateType(
             Types.makeUnion(
               name = Some("GoodUnion"),
               description = None,
@@ -298,7 +298,7 @@ object ValidationSchemaSpec extends ZIOSpecDefault {
             graphQL(resolverFieldWithArg).interpreter.exit.map(assert(_)(succeeds(anything)))
           },
           test("fields with additional nullable args are valid") {
-            assert(Validator.validateObject(nullableExtraArgsObject))(isRight)
+            assert(SchemaValidator.validateType(nullableExtraArgsObject))(isRight)
           },
           test("fields with additional non-nullable args are invalid") {
             checkTypeError(