diff --git a/index.test-d.ts b/index.test-d.ts
index 50978e53..305d2e3b 100644
--- a/index.test-d.ts
+++ b/index.test-d.ts
@@ -2,8 +2,10 @@ import { expectType, expectNotType } from "tsd";
 import { Octokit } from "@octokit/core";
 import GitHubProject, {
   GitHubProjectError,
+  GitHubProjectNotFoundError,
   GitHubProjectUnknownFieldError,
   GitHubProjectUnknownFieldOptionError,
+  GitHubProjectUpdateReadOnlyFieldError,
 } from "./index";
 
 export function smokeTest() {
@@ -309,7 +311,7 @@ export async function getItemByRepositoryAndNumberTest() {
   });
   const item = await project.items.getByContentRepositoryAndNumber(
     "repository-name",
-    1,
+    1
   );
 
   if (typeof item === "undefined") {
@@ -460,7 +462,7 @@ export async function updateItemByContentRepositoryAndNumberTest() {
     1,
     {
       status: "new status",
-    },
+    }
   );
 
   if (typeof item === "undefined") {
@@ -539,7 +541,7 @@ export async function archiveItemByContentRepositoryAndNameTest() {
   });
   const item = await project.items.archiveByContentRepositoryAndNumber(
     "repository-name",
-    1,
+    1
   );
 
   if (typeof item === "undefined") {
@@ -590,7 +592,7 @@ export async function removeItemByContentRepositoryAndNameTest() {
   });
   const item = await project.items.removeByContentRepositoryAndNumber(
     "repository-name",
-    1,
+    1
   );
 
   if (typeof item === "undefined") {
@@ -655,6 +657,18 @@ export function testGitHubProjectError() {
   expectType<string>(error.toHumanMessage());
 }
 
+export function testGitHubProjectNotFoundError() {
+  const details = {
+    owner: "owner",
+    number: 1,
+  };
+  const error = new GitHubProjectNotFoundError(details);
+
+  expectType<"GitHubProjectNotFoundError">(error.name);
+  expectType<typeof details>(error.details);
+  expectType<string>(error.toHumanMessage());
+}
+
 export function testGitHubProjectUnknownFieldError() {
   const details = {
     projectFieldNames: ["one", "two"],
@@ -688,3 +702,21 @@ export function testGitHubProjectUnknownFieldOptionError() {
   expectType<typeof details>(error.details);
   expectType<string>(error.toHumanMessage());
 }
+
+export function testGitHubProjectUpdateReadOnlyFieldError() {
+  const details = {
+    fields: [
+      {
+        id: "field id",
+        name: "field name",
+        userName: "user name",
+        userValue: "user value",
+      },
+    ],
+  };
+  const error = new GitHubProjectUpdateReadOnlyFieldError(details);
+
+  expectType<"GitHubProjectUpdateReadOnlyFieldError">(error.name);
+  expectType<typeof details>(error.details);
+  expectType<string>(error.toHumanMessage());
+}
diff --git a/test/snapshots/recorded.test.js.md b/test/snapshots/recorded.test.js.md
index b45de11e..10a2c484 100644
--- a/test/snapshots/recorded.test.js.md
+++ b/test/snapshots/recorded.test.js.md
@@ -49,130 +49,12 @@ Generated by [AVA](https://avajs.dev).
 
 > Snapshot 1
 
-    GraphqlResponseError {
-      data: {
-        userOrOrganization: {
-          projectV2: null,
-        },
-      },
-      errors: [
-        {
-          locations: [
-            {
-              column: 9,
-              line: 5,
-            },
-          ],
-          message: 'Could not resolve to a ProjectV2 with the number 99999.',
-          path: [
-            'userOrOrganization',
-            'projectV2',
-          ],
-          type: 'NOT_FOUND',
-        },
-      ],
-      headers: {
-        'access-control-allow-origin': '*',
-        'access-control-expose-headers': 'ETag, Link, Location, Retry-After, X-GitHub-OTP, X-RateLimit-Limit, X-RateLimit-Remaining, X-RateLimit-Used, X-RateLimit-Resource, X-RateLimit-Reset, X-OAuth-Scopes, X-Accepted-OAuth-Scopes, X-Poll-Interval, X-GitHub-Media-Type, X-GitHub-SSO, X-GitHub-Request-Id, Deprecation, Sunset',
-        connection: 'close',
-        'content-encoding': 'gzip',
-        'content-security-policy': 'default-src \'none\'',
-        'content-type': 'application/json; charset=utf-8',
-        date: 'Sat, 20 May 2023 00:15:13 GMT',
-        'referrer-policy': 'origin-when-cross-origin, strict-origin-when-cross-origin',
-        server: 'GitHub.com',
-        'strict-transport-security': 'max-age=31536000; includeSubdomains; preload',
-        'transfer-encoding': 'chunked',
-        vary: 'Accept-Encoding, Accept, X-Requested-With',
-        'x-content-type-options': 'nosniff',
-        'x-frame-options': 'deny',
-        'x-github-media-type': 'github.v3; format=json',
-        'x-github-request-id': 'E53B:4AD2:8F6A462:944B6F1:64681111',
-        'x-ratelimit-limit': '5000',
-        'x-ratelimit-remaining': '4989',
-        'x-ratelimit-reset': '1684545298',
-        'x-ratelimit-resource': 'graphql',
-        'x-ratelimit-used': '11',
-        'x-xss-protection': '0',
-      },
-      request: {
-        query: `␊
-          query getProjectCoreData($owner: String!, $number: Int!) {␊
-            userOrOrganization: repositoryOwner(login: $owner) {␊
-              ... on ProjectV2Owner {␊
-                projectV2(number: $number) {␊
-                  ␊
-          id␊
-          title␊
-          url␊
-          databaseId␊
-          fields(first: 50) {␊
-            nodes {␊
-              ... on ProjectV2FieldCommon {␊
-                id␊
-                dataType␊
-                name␊
-              }␊
-              ... on ProjectV2SingleSelectField {␊
-                options {␊
-                  id␊
-                  name␊
-                }␊
-              }␊
-              ... on ProjectV2IterationField {␊
-                configuration {␊
-                  iterations {␊
-                    title␊
-                    duration␊
-                    startDate␊
-                  }␊
-                  completedIterations {␊
-                    title␊
-                    duration␊
-                    startDate␊
-                  }␊
-                  duration␊
-                  startDay␊
-                }␊
-              }␊
-            }␊
-          }␊
-        ␊
-                }␊
-              }␊
-            }␊
-          }␊
-        `,
-        variables: {
-          number: 99999,
-          owner: 'github-project-fixtures',
-        },
-      },
-      response: {
-        data: {
-          userOrOrganization: {
-            projectV2: null,
-          },
-        },
-        errors: [
-          {
-            locations: [
-              {
-                column: 9,
-                line: 5,
-              },
-            ],
-            message: 'Could not resolve to a ProjectV2 with the number 99999.',
-            path: [
-              'userOrOrganization',
-              'projectV2',
-            ],
-            type: 'NOT_FOUND',
-          },
-        ],
+    GitHubProjectNotFoundError {
+      details: {
+        number: 99999,
+        owner: 'github-project-fixtures',
       },
-      message: `Request failed due to following response errors:␊
-       - Could not resolve to a ProjectV2 with the number 99999.`,
+      message: 'Project cannot be found',
     }
 
 ## api.items.add
@@ -7416,128 +7298,10 @@ Generated by [AVA](https://avajs.dev).
 
 > Snapshot 1
 
-    GraphqlResponseError {
-      data: {
-        userOrOrganization: {
-          projectV2: null,
-        },
-      },
-      errors: [
-        {
-          locations: [
-            {
-              column: 9,
-              line: 5,
-            },
-          ],
-          message: 'Could not resolve to a ProjectV2 with the number 99999.',
-          path: [
-            'userOrOrganization',
-            'projectV2',
-          ],
-          type: 'NOT_FOUND',
-        },
-      ],
-      headers: {
-        'access-control-allow-origin': '*',
-        'access-control-expose-headers': 'ETag, Link, Location, Retry-After, X-GitHub-OTP, X-RateLimit-Limit, X-RateLimit-Remaining, X-RateLimit-Used, X-RateLimit-Resource, X-RateLimit-Reset, X-OAuth-Scopes, X-Accepted-OAuth-Scopes, X-Poll-Interval, X-GitHub-Media-Type, X-GitHub-SSO, X-GitHub-Request-Id, Deprecation, Sunset',
-        connection: 'close',
-        'content-encoding': 'gzip',
-        'content-security-policy': 'default-src \'none\'',
-        'content-type': 'application/json; charset=utf-8',
-        date: 'Sat, 20 May 2023 00:26:01 GMT',
-        'referrer-policy': 'origin-when-cross-origin, strict-origin-when-cross-origin',
-        server: 'GitHub.com',
-        'strict-transport-security': 'max-age=31536000; includeSubdomains; preload',
-        'transfer-encoding': 'chunked',
-        vary: 'Accept-Encoding, Accept, X-Requested-With',
-        'x-content-type-options': 'nosniff',
-        'x-frame-options': 'deny',
-        'x-github-media-type': 'github.v3; format=json',
-        'x-github-request-id': 'E839:7581:96367AB:9ADE7CC:64681399',
-        'x-ratelimit-limit': '5000',
-        'x-ratelimit-remaining': '4496',
-        'x-ratelimit-reset': '1684545298',
-        'x-ratelimit-resource': 'graphql',
-        'x-ratelimit-used': '504',
-        'x-xss-protection': '0',
-      },
-      request: {
-        query: `␊
-          query getProjectCoreData($owner: String!, $number: Int!) {␊
-            userOrOrganization: repositoryOwner(login: $owner) {␊
-              ... on ProjectV2Owner {␊
-                projectV2(number: $number) {␊
-                  ␊
-          id␊
-          title␊
-          url␊
-          databaseId␊
-          fields(first: 50) {␊
-            nodes {␊
-              ... on ProjectV2FieldCommon {␊
-                id␊
-                dataType␊
-                name␊
-              }␊
-              ... on ProjectV2SingleSelectField {␊
-                options {␊
-                  id␊
-                  name␊
-                }␊
-              }␊
-              ... on ProjectV2IterationField {␊
-                configuration {␊
-                  iterations {␊
-                    title␊
-                    duration␊
-                    startDate␊
-                  }␊
-                  completedIterations {␊
-                    title␊
-                    duration␊
-                    startDate␊
-                  }␊
-                  duration␊
-                  startDay␊
-                }␊
-              }␊
-            }␊
-          }␊
-        ␊
-                }␊
-              }␊
-            }␊
-          }␊
-        `,
-        variables: {
-          number: 99999,
-          owner: 'github-project-fixtures',
-        },
-      },
-      response: {
-        data: {
-          userOrOrganization: {
-            projectV2: null,
-          },
-        },
-        errors: [
-          {
-            locations: [
-              {
-                column: 9,
-                line: 5,
-              },
-            ],
-            message: 'Could not resolve to a ProjectV2 with the number 99999.',
-            path: [
-              'userOrOrganization',
-              'projectV2',
-            ],
-            type: 'NOT_FOUND',
-          },
-        ],
+    GitHubProjectNotFoundError {
+      details: {
+        number: 99999,
+        owner: 'github-project-fixtures',
       },
-      message: `Request failed due to following response errors:␊
-       - Could not resolve to a ProjectV2 with the number 99999.`,
+      message: 'Project cannot be found',
     }
diff --git a/test/snapshots/recorded.test.js.snap b/test/snapshots/recorded.test.js.snap
index 8bb56811..2b864694 100644
Binary files a/test/snapshots/recorded.test.js.snap and b/test/snapshots/recorded.test.js.snap differ