diff --git a/CHANGELOG.md b/CHANGELOG.md
index faf0955..1ad19f2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,13 @@
 
 All notable changes to this project will be documented in this file. See [standard-version](https://github.com/conventional-changelog/standard-version) for commit guidelines.
 
+## [1.1.0-alpha.1](https://github.com/prismicio/prismic-custom-types-client/compare/v1.0.2...v1.1.0-alpha.1) (2023-03-27)
+
+
+### Features
+
+* support `401 Unauthorized` errors ([937aabd](https://github.com/prismicio/prismic-custom-types-client/commit/937aabd51843e0751c6a40e66f8e2a5d459459bd))
+
 ### [1.0.2](https://github.com/prismicio/prismic-custom-types-client/compare/v1.0.1...v1.0.2) (2022-12-19)
 
 
diff --git a/package-lock.json b/package-lock.json
index dbdfd7e..c1dd1e0 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
 	"name": "@prismicio/custom-types-client",
-	"version": "1.0.2",
+	"version": "1.1.0-alpha.1",
 	"lockfileVersion": 2,
 	"requires": true,
 	"packages": {
 		"": {
 			"name": "@prismicio/custom-types-client",
-			"version": "1.0.2",
+			"version": "1.1.0-alpha.1",
 			"license": "Apache-2.0",
 			"dependencies": {
 				"@prismicio/types": "^0.2.4"
diff --git a/package.json b/package.json
index 1d48afe..9b61f17 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
 	"name": "@prismicio/custom-types-client",
-	"version": "1.0.2",
+	"version": "1.1.0-alpha.1",
 	"description": "JavaScript client to interact with the Prismic Custom Types API",
 	"keywords": [
 		"typescript",
diff --git a/src/client.ts b/src/client.ts
index 2328990..8a08fa8 100644
--- a/src/client.ts
+++ b/src/client.ts
@@ -7,6 +7,7 @@ import {
 	ConflictError,
 	NotFoundError,
 	ForbiddenError,
+	UnauthorizedError,
 	InvalidPayloadError,
 } from "./errors";
 
@@ -459,6 +460,14 @@ export class CustomTypesClient {
 				throw new InvalidPayloadError(text, { url, response: text });
 			}
 
+			// Unauthorized
+			// - User does not have access to requested repository
+			case 401: {
+				const text = await res.text();
+
+				throw new UnauthorizedError(text, { url, response: text });
+			}
+
 			// Forbidden
 			// - Missing token
 			// - Incorrect token
diff --git a/src/errors.ts b/src/errors.ts
index 7f09481..ded5279 100644
--- a/src/errors.ts
+++ b/src/errors.ts
@@ -58,6 +58,11 @@ export interface ForbiddenErrorAPIResponse {
  * Represents an error when making an unauthorized Prismic Custom Types API
  * request.
  */
+export class UnauthorizedError extends PrismicError<string> {}
+
+/**
+ * Represents an error when making a forbidden Prismic Custom Types API request.
+ */
 export class ForbiddenError extends PrismicError<ForbiddenErrorAPIResponse> {}
 
 /**
diff --git a/src/index.ts b/src/index.ts
index 56ae846..0569400 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -8,6 +8,7 @@ export {
 	PrismicError,
 	ConflictError,
 	ForbiddenError,
+	UnauthorizedError,
 	InvalidPayloadError,
 	MissingFetchError,
 	NotFoundError,
diff --git a/test/client.test.ts b/test/client.test.ts
index fd32b9e..25ac610 100644
--- a/test/client.test.ts
+++ b/test/client.test.ts
@@ -152,7 +152,26 @@ test("doesn't duplicate endpoint trailing slash", async (ctx) => {
 	);
 });
 
-test("throws ForbiddenError if unauthorized", async (ctx) => {
+test("throws UnauthorizedError if unauthorized", async (ctx) => {
+	const client = createClient(ctx);
+
+	ctx.server.use(
+		msw.rest.get(
+			new URL("./customtypes", client.endpoint).toString(),
+			(_req, res, ctx) => {
+				// We force the API to return a 401 status code to simulate an
+				// unauthorized request.
+				return res(ctx.status(401), ctx.text("[MOCK UNAUTHORIZED ERROR]"));
+			},
+		),
+	);
+
+	await expect(async () => {
+		await client.getAllCustomTypes();
+	}).rejects.toThrow(prismicCustomTypes.UnauthorizedError);
+});
+
+test("throws ForbiddenError if forbidden", async (ctx) => {
 	const client = createClient(ctx);
 
 	ctx.server.use(