diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index a4ab645..139d094 100644
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -4,6 +4,7 @@ updates:
   directory: "/"
   schedule:
     interval: "daily"
+
 - package-ecosystem: "github-actions"
   directory: "/"
   schedule:
diff --git a/.github/workflows/codeql-analysis.yml b/.github/workflows/codeql-analysis.yml
index bda8576..7e2a235 100644
--- a/.github/workflows/codeql-analysis.yml
+++ b/.github/workflows/codeql-analysis.yml
@@ -32,7 +32,7 @@ jobs:
 
     - name: Install dependencies
       working-directory: src
-      run: dotnet restore -p:GraphQLTestVersion=5.0.0-preview-411
+      run: dotnet restore -p:GraphQLTestVersion=5.1.1
 
     - name: Build solution
       working-directory: src
diff --git a/.github/workflows/label.yml b/.github/workflows/label.yml
index 7ac774f..30ef4f7 100644
--- a/.github/workflows/label.yml
+++ b/.github/workflows/label.yml
@@ -6,13 +6,16 @@
 # https://github.com/actions/labeler/blob/master/README.md
 
 name: Labeler
-on: [pull_request]
+on:
+  pull_request_target:
+    types:
+      - opened        # when PR is opened
 
 jobs:
   label:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/labeler@v3
+    - uses: actions/labeler@v4
       with:
         sync-labels: ""
         repo-token: "${{ secrets.GITHUB_TOKEN }}"
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 6afa90f..e1d29f8 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -30,7 +30,7 @@ jobs:
           - ubuntu-latest
           - windows-latest
         graphqlversion:
-          - 5.0.0-preview-411
+          - 5.1.1
     steps:
       - name: Checkout source
         uses: actions/checkout@v2
@@ -54,10 +54,7 @@ jobs:
         if: ${{ startsWith(matrix.os, 'ubuntu') }}
         working-directory: src
         run: |
-          dotnet tool install -g dotnet-format --version 6.0.243104 --add-source https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-tools/nuget/v3/index.json
-          dotnet format --no-restore --verify-no-changes -v diag --severity warn whitespace || (echo "Run 'dotnet format' to fix whitespace issues" && exit 1)
-          dotnet format --no-restore --verify-no-changes -v diag --severity warn analyzers || (echo "Run 'dotnet format' to fix analyzers issues" && exit 1)
-          dotnet format --no-restore --verify-no-changes -v diag --severity warn style || (echo "Run 'dotnet format' to fix style issues" && exit 1)
+          dotnet format --no-restore --verify-no-changes --severity warn || (echo "Run 'dotnet format' to fix issues" && exit 1)
       - name: Build solution [Release]
         working-directory: src
         run: dotnet build --no-restore -c Release -p:GraphQLTestVersion=${{ matrix.graphqlversion }}
diff --git a/src/BasicSample/BasicSample.csproj b/src/BasicSample/BasicSample.csproj
index 40fad25..4f50bff 100644
--- a/src/BasicSample/BasicSample.csproj
+++ b/src/BasicSample/BasicSample.csproj
@@ -11,7 +11,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="GraphQL.SystemTextJson" Version="5.0.0-preview-411" />
+    <PackageReference Include="GraphQL.SystemTextJson" Version="5.1.1" />
     <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="6.0.0" />
   </ItemGroup>
 
diff --git a/src/BasicSample/Program.cs b/src/BasicSample/Program.cs
index b9bb902..1ba372c 100644
--- a/src/BasicSample/Program.cs
+++ b/src/BasicSample/Program.cs
@@ -74,7 +74,7 @@ public class Query
         /// <summary>
         /// Resolver for 'Query.viewer' field.
         /// </summary>
-        [GraphQLAuthorize("AdminPolicy")]
+        [Authorize("AdminPolicy")]
         public User Viewer() => new() { Id = Guid.NewGuid().ToString(), Name = "Quinn" };
 
         /// <summary>
diff --git a/src/GraphQL.Authorization.ApiTests/GraphQL.Authorization.ApiTests.csproj b/src/GraphQL.Authorization.ApiTests/GraphQL.Authorization.ApiTests.csproj
index df49e9b..52cf5eb 100644
--- a/src/GraphQL.Authorization.ApiTests/GraphQL.Authorization.ApiTests.csproj
+++ b/src/GraphQL.Authorization.ApiTests/GraphQL.Authorization.ApiTests.csproj
@@ -6,7 +6,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="PublicApiGenerator" Version="10.2.0" />
+    <PackageReference Include="PublicApiGenerator" Version="10.3.0" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/src/GraphQL.Authorization.Tests/AuthorizationSchemaBuilderTests.cs b/src/GraphQL.Authorization.Tests/AuthorizationSchemaBuilderTests.cs
index 95413a7..02fccbc 100644
--- a/src/GraphQL.Authorization.Tests/AuthorizationSchemaBuilderTests.cs
+++ b/src/GraphQL.Authorization.Tests/AuthorizationSchemaBuilderTests.cs
@@ -30,10 +30,10 @@ type Query {
         }
 
         [GraphQLMetadata("Query")]
-        [GraphQLAuthorize("ClassPolicy")]
+        [Authorize("ClassPolicy")]
         public class QueryWithAttributes
         {
-            [GraphQLAuthorize("FieldPolicy")]
+            [Authorize("FieldPolicy")]
             [System.Diagnostics.CodeAnalysis.SuppressMessage("Style", "IDE0060:Remove unused parameter", Justification = "test")]
             public string Post(string id) => "";
         }
diff --git a/src/GraphQL.Authorization.Tests/AuthorizationValidationRuleTests.cs b/src/GraphQL.Authorization.Tests/AuthorizationValidationRuleTests.cs
index 45592ce..ef536dc 100644
--- a/src/GraphQL.Authorization.Tests/AuthorizationValidationRuleTests.cs
+++ b/src/GraphQL.Authorization.Tests/AuthorizationValidationRuleTests.cs
@@ -331,10 +331,10 @@ type Query {
         }
 
         [GraphQLMetadata("Query")]
-        [GraphQLAuthorize("ClassPolicy")]
+        [Authorize("ClassPolicy")]
         public class BasicQueryWithAttributes
         {
-            [GraphQLAuthorize("FieldPolicy")]
+            [Authorize("FieldPolicy")]
             [System.Diagnostics.CodeAnalysis.SuppressMessage("Style", "IDE0060:Remove unused parameter", Justification = "test")]
             public string Post(string id) => "";
         }
@@ -374,7 +374,7 @@ public class NestedQueryWithAttributes
             public string? Comment() => null;
         }
 
-        [GraphQLAuthorize("PostPolicy")]
+        [Authorize("PostPolicy")]
         public class Post
         {
             public string? Id { get; set; }
diff --git a/src/GraphQL.Authorization.Tests/GraphQL.Authorization.Tests.csproj b/src/GraphQL.Authorization.Tests/GraphQL.Authorization.Tests.csproj
index 13959ce..331acce 100644
--- a/src/GraphQL.Authorization.Tests/GraphQL.Authorization.Tests.csproj
+++ b/src/GraphQL.Authorization.Tests/GraphQL.Authorization.Tests.csproj
@@ -3,7 +3,7 @@
 
   <PropertyGroup>
     <TargetFrameworks>net6;net5;netcoreapp3.1</TargetFrameworks>
-    <GraphQLTestVersion>5.0.0-preview-411</GraphQLTestVersion>
+    <GraphQLTestVersion>5.1.1</GraphQLTestVersion>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/src/GraphQL.Authorization.Tests/ValidationTestBase.cs b/src/GraphQL.Authorization.Tests/ValidationTestBase.cs
index 0432cde..2ba31ed 100644
--- a/src/GraphQL.Authorization.Tests/ValidationTestBase.cs
+++ b/src/GraphQL.Authorization.Tests/ValidationTestBase.cs
@@ -4,6 +4,7 @@
 using System.Security.Claims;
 using GraphQL.Execution;
 using GraphQL.Validation;
+using GraphQLParser;
 using Shouldly;
 
 namespace GraphQL.Authorization.Tests
@@ -63,7 +64,15 @@ private static IValidationResult Validate(ValidationTestConfig config)
             var documentBuilder = new GraphQLDocumentBuilder();
             var document = documentBuilder.Build(config.Query);
             var validator = new DocumentValidator();
-            return validator.ValidateAsync(config.Schema, document, document.Operations.First().Variables, config.Rules, userContext, config.Variables, config.OperationName).GetAwaiter().GetResult().validationResult;
+            return validator.ValidateAsync(new ValidationOptions
+            {
+                Schema = config.Schema,
+                Document = document,
+                Operation = document.OperationWithName(config.OperationName),
+                Rules = config.Rules,
+                Variables = config.Variables ?? Inputs.Empty,
+                UserContext = userContext
+            }).GetAwaiter().GetResult().validationResult;
         }
 
         internal static ClaimsPrincipal CreatePrincipal(string? authenticationType = null, IDictionary<string, string>? claims = null)
diff --git a/src/GraphQL.Authorization/AuthorizationValidationRule.cs b/src/GraphQL.Authorization/AuthorizationValidationRule.cs
index e72bace..b033c90 100644
--- a/src/GraphQL.Authorization/AuthorizationValidationRule.cs
+++ b/src/GraphQL.Authorization/AuthorizationValidationRule.cs
@@ -1,9 +1,12 @@
+using System;
 using System.Collections.Generic;
-using System.Linq;
+using System.Threading;
 using System.Threading.Tasks;
-using GraphQL.Language.AST;
 using GraphQL.Types;
 using GraphQL.Validation;
+using GraphQLParser;
+using GraphQLParser.AST;
+using GraphQLParser.Visitors;
 
 namespace GraphQL.Authorization
 {
@@ -24,9 +27,9 @@ public AuthorizationValidationRule(IAuthorizationEvaluator evaluator)
             _evaluator = evaluator;
         }
 
-        private bool ShouldBeSkipped(Operation actualOperation, ValidationContext context)
+        private bool ShouldBeSkipped(GraphQLOperationDefinition actualOperation, ValidationContext context)
         {
-            if (context.Document.Operations.Count <= 1)
+            if (context.Document.OperationsCount() <= 1)
             {
                 return false;
             }
@@ -46,126 +49,132 @@ private bool ShouldBeSkipped(Operation actualOperation, ValidationContext contex
                     return true;
                 }
 
-                if (ancestor is FragmentDefinition fragment)
+                if (ancestor is GraphQLFragmentDefinition fragment)
                 {
-                    return !FragmentBelongsToOperation(fragment, actualOperation);
+                    //TODO: may be rewritten completely later
+                    var c = new FragmentBelongsToOperationVisitorContext(fragment);
+                    _visitor.VisitAsync(actualOperation, c).GetAwaiter().GetResult(); // TODO: need to think of something to avoid this
+                    return !c.Found;
                 }
             } while (true);
         }
 
-        private bool FragmentBelongsToOperation(FragmentDefinition fragment, Operation operation)
+        private sealed class FragmentBelongsToOperationVisitorContext : IASTVisitorContext
         {
-            bool belongs = false;
-            void Visit(INode node, int _)
+            public FragmentBelongsToOperationVisitorContext(GraphQLFragmentDefinition fragment)
             {
-                if (belongs)
-                {
-                    return;
-                }
+                Fragment = fragment;
+            }
 
-                belongs = node is FragmentSpread fragmentSpread && fragmentSpread.Name == fragment.Name;
+            public GraphQLFragmentDefinition Fragment { get; }
 
-                if (node != null)
-                {
-                    node.Visit(Visit, 0);
-                }
-            }
+            public bool Found { get; set; }
+
+            public CancellationToken CancellationToken => default;
+        }
 
-            operation.Visit(Visit, 0);
+        private static readonly FragmentBelongsToOperationVisitor _visitor = new();
 
-            return belongs;
+        private sealed class FragmentBelongsToOperationVisitor : ASTVisitor<FragmentBelongsToOperationVisitorContext>
+        {
+            protected override ValueTask VisitFragmentSpreadAsync(GraphQLFragmentSpread fragmentSpread, FragmentBelongsToOperationVisitorContext context)
+            {
+                context.Found = context.Fragment.FragmentName.Name == fragmentSpread.FragmentName.Name;
+                return default;
+            }
+
+            public override ValueTask VisitAsync(ASTNode? node, FragmentBelongsToOperationVisitorContext context)
+            {
+                return context.Found ? default : base.VisitAsync(node, context);
+            }
         }
 
         /// <inheritdoc />
-        public ValueTask<INodeVisitor?> ValidateAsync(ValidationContext context)
+        public async ValueTask<INodeVisitor?> ValidateAsync(ValidationContext context)
         {
             var userContext = context.UserContext as IProvideClaimsPrincipal;
+            await AuthorizeAsync(null, context.Schema, userContext, context, null);
             var operationType = OperationType.Query;
-            var actualOperation = context.Document.Operations.FirstOrDefault(x => x.Name == context.OperationName) ?? context.Document.Operations.FirstOrDefault();
 
             // this could leak info about hidden fields or types in error messages
             // it would be better to implement a filter on the Schema so it
             // acts as if they just don't exist vs. an auth denied error
             // - filtering the Schema is not currently supported
             // TODO: apply ISchemaFilter - context.Schema.Filter.AllowXXX
-            return new ValueTask<INodeVisitor?>(new NodeVisitors(
-                new MatchingNodeVisitor<Operation>((astType, context) =>
+            return new NodeVisitors(
+                new MatchingNodeVisitor<GraphQLOperationDefinition>((astType, context) =>
                 {
-                    if (context.Document.Operations.Count > 1 && astType.Name != context.OperationName)
+                    if (context.Document.OperationsCount() > 1 && astType.Name != context.Operation.Name)
                     {
                         return;
                     }
 
-                    operationType = astType.OperationType;
+                    operationType = astType.Operation;
 
                     var type = context.TypeInfo.GetLastType();
-                    CheckAuth(astType, type, userContext, context, operationType);
+                    AuthorizeAsync(astType, type, userContext, context, operationType).GetAwaiter().GetResult(); // TODO: need to think of something to avoid this
                 }),
 
-                new MatchingNodeVisitor<ObjectField>((objectFieldAst, context) =>
+                new MatchingNodeVisitor<GraphQLObjectField>((objectFieldAst, context) =>
                 {
-                    if (context.TypeInfo.GetArgument()?.ResolvedType?.GetNamedType() is IComplexGraphType argumentType && !ShouldBeSkipped(actualOperation, context))
+                    if (context.TypeInfo.GetArgument()?.ResolvedType?.GetNamedType() is IComplexGraphType argumentType && !ShouldBeSkipped(context.Operation, context))
                     {
                         var fieldType = argumentType.GetField(objectFieldAst.Name);
-                        CheckAuth(objectFieldAst, fieldType, userContext, context, operationType);
+                        AuthorizeAsync(objectFieldAst, fieldType, userContext, context, operationType).GetAwaiter().GetResult(); // TODO: need to think of something to avoid this
                     }
                 }),
 
-                new MatchingNodeVisitor<Field>((fieldAst, context) =>
+                new MatchingNodeVisitor<GraphQLField>((fieldAst, context) =>
                 {
                     var fieldDef = context.TypeInfo.GetFieldDef();
 
-                    if (fieldDef == null || ShouldBeSkipped(actualOperation, context))
+                    if (fieldDef == null || ShouldBeSkipped(context.Operation, context))
                         return;
 
                     // check target field
-                    CheckAuth(fieldAst, fieldDef, userContext, context, operationType);
+                    AuthorizeAsync(fieldAst, fieldDef, userContext, context, operationType).GetAwaiter().GetResult(); // TODO: need to think of something to avoid this
                     // check returned graph type
-                    CheckAuth(fieldAst, fieldDef.ResolvedType?.GetNamedType(), userContext, context, operationType);
+                    AuthorizeAsync(fieldAst, fieldDef.ResolvedType?.GetNamedType(), userContext, context, operationType).GetAwaiter().GetResult(); // TODO: need to think of something to avoid this
                 }),
 
-                new MatchingNodeVisitor<VariableReference>((variableRef, context) =>
+                new MatchingNodeVisitor<GraphQLVariable>((variableRef, context) =>
                 {
-                    if (context.TypeInfo.GetArgument()?.ResolvedType?.GetNamedType() is not IComplexGraphType variableType || ShouldBeSkipped(actualOperation, context))
+                    if (context.TypeInfo.GetArgument()?.ResolvedType?.GetNamedType() is not IComplexGraphType variableType || ShouldBeSkipped(context.Operation, context))
                         return;
 
-                    CheckAuth(variableRef, variableType, userContext, context, operationType);
+                    AuthorizeAsync(variableRef, variableType, userContext, context, operationType).GetAwaiter().GetResult(); // TODO: need to think of something to avoid this
 
                     // Check each supplied field in the variable that exists in the variable type.
                     // If some supplied field does not exist in the variable type then some other
                     // validation rule should check that but here we should just ignore that
                     // "unknown" field.
                     if (context.Variables != null &&
-                        context.Variables.TryGetValue(variableRef.Name, out object? input) &&
+                        context.Variables.TryGetValue(variableRef.Name.StringValue, out object? input) && //ISSUE:allocation
                         input is Dictionary<string, object> fieldsValues)
                     {
                         foreach (var field in variableType.Fields)
                         {
                             if (fieldsValues.ContainsKey(field.Name))
                             {
-                                CheckAuth(variableRef, field, userContext, context, operationType);
+                                AuthorizeAsync(variableRef, field, userContext, context, operationType).GetAwaiter().GetResult(); // TODO: need to think of something to avoid this
                             }
                         }
                     }
                 })
-            ));
+            );
         }
 
-        private void CheckAuth(
-            INode node,
+        private async Task AuthorizeAsync(
+            ASTNode? node,
             IProvideMetadata? provider,
             IProvideClaimsPrincipal? userContext,
             ValidationContext context,
             OperationType? operationType)
         {
-            if (provider == null || !provider.RequiresAuthorization())
+            if (provider == null || !provider.IsAuthorizationRequired())
                 return;
 
-            // TODO: async -> sync transition
-            var result = _evaluator
-                .Evaluate(userContext?.User, context.UserContext, context.Variables, provider.GetPolicies())
-                .GetAwaiter()
-                .GetResult();
+            var result = await _evaluator.Evaluate(userContext?.User, context.UserContext, context.Variables, provider.GetPolicies());
 
             if (result.Succeeded)
                 return;
@@ -173,10 +182,10 @@ private void CheckAuth(
             string errors = string.Join("\n", result.Errors);
 
             context.ReportError(new ValidationError(
-                context.Document.OriginalQuery!,
+                context.Document.Source,
                 "authorization",
                 $"You are not authorized to run this {operationType.ToString().ToLower()}.\n{errors}",
-                node));
+                node == null ? Array.Empty<ASTNode>() : new ASTNode[] { node }));
         }
     }
 }
diff --git a/src/GraphQL.Authorization/GraphQL.Authorization.csproj b/src/GraphQL.Authorization/GraphQL.Authorization.csproj
index d2b586d..479f04e 100644
--- a/src/GraphQL.Authorization/GraphQL.Authorization.csproj
+++ b/src/GraphQL.Authorization/GraphQL.Authorization.csproj
@@ -7,7 +7,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="GraphQL" Version="5.0.0-preview-411" />
+    <PackageReference Include="GraphQL" Version="5.1.1" />
   </ItemGroup>
 
 </Project>
diff --git a/src/Harness/GraphQL.cs b/src/Harness/GraphQL.cs
index bf1a1ac..3695f9a 100644
--- a/src/Harness/GraphQL.cs
+++ b/src/Harness/GraphQL.cs
@@ -23,7 +23,7 @@ public class Query
         /// <summary>
         /// Resolver for 'Query.viewer' field.
         /// </summary>
-        [GraphQLAuthorize("AdminPolicy")]
+        [Authorize("AdminPolicy")]
         public User Viewer() => new() { Id = Guid.NewGuid().ToString(), Name = "Quinn" };
 
         /// <summary>
diff --git a/src/Harness/Harness.csproj b/src/Harness/Harness.csproj
index 47460da..a814a7a 100644
--- a/src/Harness/Harness.csproj
+++ b/src/Harness/Harness.csproj
@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk.Web">
+<Project Sdk="Microsoft.NET.Sdk.Web">
 
   <PropertyGroup>
     <TargetFrameworks>net6;net5;netcoreapp3.1</TargetFrameworks>
@@ -9,10 +9,11 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="GraphQL.Server.Transports.AspNetCore.SystemTextJson" Version="5.1.1" />
-    <PackageReference Include="GraphQL.Server.Ui.GraphiQL" Version="5.1.1" />
-    <PackageReference Include="GraphQL.Server.Ui.Playground" Version="5.1.1" />
-    <PackageReference Include="GraphQL.Server.Transports.AspNetCore" Version="5.1.1" />
+    <PackageReference Include="GraphQL.MicrosoftDI" Version="5.1.1" />
+    <PackageReference Include="GraphQL.Server.Ui.GraphiQL" Version="6.0.0" />
+    <PackageReference Include="GraphQL.Server.Ui.Playground" Version="6.0.0" />
+    <PackageReference Include="GraphQL.Server.Transports.AspNetCore" Version="6.0.0" />
+    <PackageReference Include="GraphQL.SystemTextJson" Version="5.1.1" />
   </ItemGroup>
 
 </Project>
diff --git a/src/Harness/Startup.cs b/src/Harness/Startup.cs
index b2f2920..1ed91df 100644
--- a/src/Harness/Startup.cs
+++ b/src/Harness/Startup.cs
@@ -1,5 +1,7 @@
 using GraphQL;
+using GraphQL.MicrosoftDI;
 using GraphQL.Server;
+using GraphQL.SystemTextJson;
 using GraphQL.Types;
 using Microsoft.AspNetCore.Builder;
 using Microsoft.AspNetCore.Hosting;
@@ -35,7 +37,7 @@ type Query {
                   }
                 ";
                 var schema = Schema.For(definitions, builder => builder.Types.Include<Query>());
-                schema.AllTypes["User"]!.AuthorizeWith("AdminPolicy");
+                schema.AllTypes["User"]!.AuthorizeWithPolicy("AdminPolicy");
                 return schema;
             });
 
@@ -46,10 +48,9 @@ type Query {
             // claims principal must look something like this to allow access
             // var user = new ClaimsPrincipal(new ClaimsIdentity(new[] { new Claim("role", "Admin") }));
 
-            services
-                .AddGraphQL()
+            services.AddGraphQL(builder => builder
                 .AddSystemTextJson()
-                .AddUserContextBuilder(context => new GraphQLUserContext { User = context.User });
+                .AddUserContextBuilder(context => new GraphQLUserContext { User = context.User }));
         }
 
         public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
diff --git a/src/Tests.props b/src/Tests.props
index 6db0c28..b947515 100644
--- a/src/Tests.props
+++ b/src/Tests.props
@@ -7,11 +7,11 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="coverlet.msbuild" Version="3.1.0">
+    <PackageReference Include="coverlet.msbuild" Version="3.1.2">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.0.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.1.0" />
     <PackageReference Include="Shouldly" Version="4.0.3" />
     <PackageReference Include="xunit" Version="2.4.1" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.4.3" />