diff --git a/src/errors/masto-conflict-error.ts b/src/errors/masto-conflict-error.ts
index 30b5d84e8..630025c5d 100644
--- a/src/errors/masto-conflict-error.ts
+++ b/src/errors/masto-conflict-error.ts
@@ -1,13 +1,16 @@
-import { MastoError } from './masto-error';
+import { MastoError, MastoErrorDetails } from './masto-error';
 
 /**
  * Mastodon forbidden error
  */
 export class MastoConflictError extends MastoError {
   readonly name = 'MastoConflictError';
-  readonly statusCode = 409;
 
-  constructor(readonly message: string, readonly description?: string) {
-    super();
+  constructor(
+    readonly message: string,
+    readonly description?: string,
+    readonly details?: MastoErrorDetails,
+  ) {
+    super(message, 409, description, details);
   }
 }
diff --git a/src/errors/masto-error.ts b/src/errors/masto-error.ts
index 234da0c17..75ae49332 100644
--- a/src/errors/masto-error.ts
+++ b/src/errors/masto-error.ts
@@ -1,14 +1,41 @@
+// https://github.com/tootsuite/mastodon/pull/15803
+export type MastoErrorType =
+  | 'ERR_BLOCKED'
+  | 'ERR_UNREACHABLE'
+  | 'ERR_TAKEN'
+  | 'ERR_RESERVED'
+  | 'ERR_ACCEPTED'
+  | 'ERR_BLANK'
+  | 'ERR_INVALID'
+  | 'ERR_TOO_LONG'
+  | 'ERR_TOO_SHORT'
+  | 'ERR_INCLUSION';
+
+export interface MastoErrorDetail {
+  readonly error: MastoErrorType;
+  readonly description: string;
+}
+
+export type MastoErrorDetails = Record<string, readonly MastoErrorDetail[]>;
+
 /**
  * Error object
  * @see https://docs.joinmastodon.org/entities/error/
  */
-export abstract class MastoError extends Error {
+export class MastoError extends Error {
   /** Helper to check if the error has been thrown from Masto */
   readonly isMastoError = true;
-  /** HTTP status code */
-  readonly statusCode?: number;
-  /** The error message. Equivalent for the `error` field from the Error entity */
-  abstract readonly message: string;
-  /** A longer description of the error, mainly provided with the OAuth API. */
-  abstract readonly description?: string | null;
+
+  constructor(
+    /** The error message. Equivalent for the `error` field from the Error entity */
+    readonly message: string,
+    /** HTTP status code */
+    readonly statusCode?: number,
+    /** A longer description of the error, mainly provided with the OAuth API. */
+    readonly description?: string | null,
+    /** Used by /api/v1/accounts */
+    readonly details?: MastoErrorDetails | null,
+  ) {
+    super();
+  }
 }
diff --git a/src/errors/masto-forbidden-error.ts b/src/errors/masto-forbidden-error.ts
index 33da49bf0..9721b1289 100644
--- a/src/errors/masto-forbidden-error.ts
+++ b/src/errors/masto-forbidden-error.ts
@@ -1,13 +1,16 @@
-import { MastoError } from './masto-error';
+import { MastoError, MastoErrorDetails } from './masto-error';
 
 /**
  * Mastodon forbidden error
  */
 export class MastoForbiddenError extends MastoError {
   readonly name = 'MastoForbiddenError';
-  readonly statusCode = 403;
 
-  constructor(readonly message: string, readonly description?: string) {
-    super();
+  constructor(
+    message: string,
+    description?: string,
+    details?: MastoErrorDetails,
+  ) {
+    super(message, 403, description, details);
   }
 }
diff --git a/src/errors/masto-gone-error.ts b/src/errors/masto-gone-error.ts
index cfe3469f2..7d9767854 100644
--- a/src/errors/masto-gone-error.ts
+++ b/src/errors/masto-gone-error.ts
@@ -1,13 +1,16 @@
-import { MastoError } from './masto-error';
+import { MastoError, MastoErrorDetails } from './masto-error';
 
 /**
  * Mastodon gone error
  */
 export class MastoGoneError extends MastoError {
   readonly name = 'MastoGoneError';
-  readonly statusCode = 410;
 
-  constructor(readonly message: string, readonly description?: string) {
-    super();
+  constructor(
+    message: string,
+    description?: string,
+    details?: MastoErrorDetails,
+  ) {
+    super(message, 410, description, details);
   }
 }
diff --git a/src/errors/masto-not-found-error.ts b/src/errors/masto-not-found-error.ts
index 866a9e699..ec3de5a03 100644
--- a/src/errors/masto-not-found-error.ts
+++ b/src/errors/masto-not-found-error.ts
@@ -1,13 +1,16 @@
-import { MastoError } from './masto-error';
+import { MastoError, MastoErrorDetails } from './masto-error';
 
 /**
  * Mastodon not found error class
  */
 export class MastoNotFoundError extends MastoError {
-  readonly statusCode = 404;
   readonly name = 'MastoNotFoundError';
 
-  constructor(readonly message: string, readonly description?: string) {
-    super();
+  constructor(
+    message: string,
+    description?: string,
+    details?: MastoErrorDetails,
+  ) {
+    super(message, 404, description, details);
   }
 }
diff --git a/src/errors/masto-rate-limit-error.ts b/src/errors/masto-rate-limit-error.ts
index 64d7c895d..6456db54c 100644
--- a/src/errors/masto-rate-limit-error.ts
+++ b/src/errors/masto-rate-limit-error.ts
@@ -1,4 +1,4 @@
-import { MastoError } from './masto-error';
+import { MastoError, MastoErrorDetails } from './masto-error';
 
 /**
  * Mastodon rate limit error class
@@ -6,18 +6,18 @@ import { MastoError } from './masto-error';
  */
 export class MastoRateLimitError extends MastoError {
   readonly name = 'MastoRateLimitError';
-  readonly statusCode = 429;
 
   constructor(
-    readonly message: string,
+    message: string,
     /** Number of requests permitted per time period */
     readonly limit: number,
     /** Number of requests you can still make */
     readonly remaining: number,
     /** Timestamp when your rate limit will reset */
     readonly reset: string,
-    readonly description?: string,
+    description?: string,
+    details?: MastoErrorDetails,
   ) {
-    super();
+    super(message, 429, description, details);
   }
 }
diff --git a/src/errors/masto-timeout-error.ts b/src/errors/masto-timeout-error.ts
index 77f2c8c04..ab4489e15 100644
--- a/src/errors/masto-timeout-error.ts
+++ b/src/errors/masto-timeout-error.ts
@@ -1,4 +1,4 @@
-import { MastoError } from './masto-error';
+import { MastoError, MastoErrorDetails } from './masto-error';
 
 /**
  * Mastodon Timeout error
@@ -7,7 +7,11 @@ import { MastoError } from './masto-error';
 export class MastoTimeoutError extends MastoError {
   readonly name = 'MastoTimeoutError';
 
-  constructor(readonly message: string, readonly description?: string) {
-    super();
+  constructor(
+    message: string,
+    description?: string,
+    details?: MastoErrorDetails,
+  ) {
+    super(message, undefined, description, details);
   }
 }
diff --git a/src/errors/masto-unauthorized-error.ts b/src/errors/masto-unauthorized-error.ts
index 5dc85a329..5d046c762 100644
--- a/src/errors/masto-unauthorized-error.ts
+++ b/src/errors/masto-unauthorized-error.ts
@@ -1,14 +1,17 @@
-import { MastoError } from './masto-error';
+import { MastoError, MastoErrorDetails } from './masto-error';
 
 /**
  * Mastodon unauthorized error class
  * @param message Message for users
  */
 export class MastoUnauthorizedError extends MastoError {
-  readonly statusCode = 401;
   readonly name = 'MastoUnauthorizedError';
 
-  constructor(readonly message: string, readonly description?: string) {
-    super();
+  constructor(
+    message: string,
+    description?: string,
+    details?: MastoErrorDetails,
+  ) {
+    super(message, 401, description, details);
   }
 }
diff --git a/src/errors/masto-unprocessable-entity-error.ts b/src/errors/masto-unprocessable-entity-error.ts
index 7e13d601c..b0b1ab2cc 100644
--- a/src/errors/masto-unprocessable-entity-error.ts
+++ b/src/errors/masto-unprocessable-entity-error.ts
@@ -1,4 +1,4 @@
-import { MastoError } from './masto-error';
+import { MastoError, MastoErrorDetails } from './masto-error';
 
 /**
  * Mastodon unprocessable entity
@@ -6,9 +6,12 @@ import { MastoError } from './masto-error';
  */
 export class MastoUnprocessableEntityError extends MastoError {
   readonly name = 'MastoUnprocessableEntityError';
-  readonly statusCode = 422;
 
-  constructor(readonly message: string, readonly description?: string) {
-    super();
+  constructor(
+    message: string,
+    description?: string,
+    details?: MastoErrorDetails,
+  ) {
+    super(message, 422, description, details);
   }
 }
diff --git a/src/http/http-axios-impl.ts b/src/http/http-axios-impl.ts
index b48078a74..5b0fb51e2 100644
--- a/src/http/http-axios-impl.ts
+++ b/src/http/http-axios-impl.ts
@@ -3,6 +3,7 @@ import axios, { AxiosInstance } from 'axios';
 import { MastoConfig } from '../config';
 import {
   MastoConflictError,
+  MastoError,
   MastoForbiddenError,
   MastoGoneError,
   MastoNotFoundError,
@@ -73,20 +74,22 @@ export class HttpAxiosImpl implements Http {
       const message =
         error?.response?.data?.error ?? 'Unexpected error occurred';
       const description = error?.response?.data?.errorDescription;
+      const details = error?.response?.data?.details;
+      const args = [message, description, details] as const;
 
       switch (status) {
         case 401:
-          throw new MastoUnauthorizedError(message, description);
+          throw new MastoUnauthorizedError(...args);
         case 403:
-          throw new MastoForbiddenError(message, description);
+          throw new MastoForbiddenError(...args);
         case 404:
-          throw new MastoNotFoundError(message, description);
+          throw new MastoNotFoundError(...args);
         case 409:
-          throw new MastoConflictError(message, description);
+          throw new MastoConflictError(...args);
         case 410:
-          throw new MastoGoneError(message, description);
+          throw new MastoGoneError(...args);
         case 422:
-          throw new MastoUnprocessableEntityError(message, description);
+          throw new MastoUnprocessableEntityError(...args);
         case 429:
           throw new MastoRateLimitError(
             message,
@@ -96,7 +99,7 @@ export class HttpAxiosImpl implements Http {
             description,
           );
         default:
-          throw error;
+          throw new MastoError(...args);
       }
     }
   }