diff --git a/src/index.ts b/src/index.ts
index befca60..6d500e1 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -101,30 +101,29 @@ export interface HcaptchaResponse {
  * @see {@link HcaptchaResponse}
  * @see {@link https://docs.hcaptcha.com/#siteverify-error-codes-table}
  */
-export enum HcaptchaError {
+export type HcaptchaError =
   /** Secret key is missing */
-  MissingInputSecret = "missing-input-secret",
+  | "missing-input-secret"
   /** Secret key is invalid */
-  InvalidInputSecret = "invalid-input-secret",
+  | "invalid-input-secret"
   /** User response token is missing */
-  MissingInputResponse = "missing-input-response",
+  | "missing-input-response"
   /** User response token is invalid */
-  InvalidInputResponse = "invalid-input-response",
+  | "invalid-input-response"
   /** Site key is invalid */
-  InvalidSiteKey = "invalid-sitekey",
+  | "invalid-sitekey"
   /** Remote user IP is invalid */
-  InvalidRemoteIp = "invalid-remoteip",
+  | "invalid-remoteip"
   /** Request is invalid */
-  BadRequest = "bad-request",
+  | "bad-request"
   /** User response token is invalid or has already been checked */
-  InvalidOrAlreadySeenResponse = "invalid-or-already-seen-response",
+  | "invalid-or-already-seen-response"
   /** Must use the test site key when using a test verification token */
-  NotUsingDummyPassCode = "not-using-dummy-passcode",
+  | "not-using-dummy-passcode"
   /** Must use the test secret key when using a test verification token */
-  NotUsingDummySecret = "not-using-dummy-secret",
+  | "not-using-dummy-secret"
   /** The site key is not associated to the secret key */
-  SiteKeySecretMismatch = "sitekey-secret-mismatch",
-}
+  | "sitekey-secret-mismatch";
 
 /**
  * `RawHcaptchaResponse` represents the raw response to the verification challenge
diff --git a/test/index.test.ts b/test/index.test.ts
index d95ad9a..bd77b51 100644
--- a/test/index.test.ts
+++ b/test/index.test.ts
@@ -6,7 +6,7 @@ import FSPersister from "@pollyjs/persister-fs";
 import nock from "nock";
 import * as path from "path";
 import { setupPolly } from "setup-polly-jest";
-import { HcaptchaError, verifyHcaptchaToken } from "../src";
+import { verifyHcaptchaToken } from "../src";
 
 // See https://github.com/gribnoysup/setup-polly-jest/issues/23#issuecomment-890494186
 // Polly.register(NodeHttpAdapter);
@@ -43,8 +43,8 @@ describe("verifyHcaptchaToken", () => {
 
     expect(success).toEqual(false);
     expect(errorCodes).toEqual([
-      HcaptchaError.MissingInputResponse,
-      HcaptchaError.MissingInputSecret,
+      "missing-input-response",
+      "missing-input-secret",
     ]);
 
     expect(res).toMatchSnapshot();
@@ -59,7 +59,7 @@ describe("verifyHcaptchaToken", () => {
     const { success, errorCodes } = res;
 
     expect(success).toEqual(false);
-    expect(errorCodes).toEqual([HcaptchaError.MissingInputResponse]);
+    expect(errorCodes).toEqual(["missing-input-response"]);
 
     expect(res).toMatchSnapshot();
   });
@@ -74,7 +74,7 @@ describe("verifyHcaptchaToken", () => {
     const { success, errorCodes } = res;
 
     expect(success).toEqual(false);
-    expect(errorCodes).toEqual([HcaptchaError.InvalidInputResponse]);
+    expect(errorCodes).toEqual(["invalid-input-response"]);
 
     expect(res).toMatchSnapshot();
   });
@@ -92,7 +92,7 @@ describe("verifyHcaptchaToken", () => {
 
     // NOTE: this error is returned by the API
     // but is not documented in the hCaptcha developer docs
-    expect(errorCodes).toEqual([HcaptchaError.NotUsingDummySecret]);
+    expect(errorCodes).toEqual(["not-using-dummy-secret"]);
 
     expect(res).toMatchSnapshot({
       challengeTimestamp: expect.any(String),
@@ -113,7 +113,7 @@ describe("verifyHcaptchaToken", () => {
 
     // NOTE: this error is returned by the API
     // but is not documented in the hCaptcha developer docs
-    expect(errorCodes).toEqual([HcaptchaError.InvalidSiteKey]);
+    expect(errorCodes).toEqual(["invalid-sitekey"]);
 
     expect(res).toMatchSnapshot();
   });
@@ -133,7 +133,7 @@ describe("verifyHcaptchaToken", () => {
 
     // NOTE: this error is returned by the API
     // but is not documented in the hCaptcha developer docs
-    expect(errorCodes).toEqual([HcaptchaError.InvalidRemoteIp]);
+    expect(errorCodes).toEqual(["invalid-remoteip"]);
 
     expect(res).toMatchSnapshot();
   });