diff --git a/packages/discord.js/src/structures/ApplicationCommand.js b/packages/discord.js/src/structures/ApplicationCommand.js
index 159395af2..dcf80d9bb 100644
--- a/packages/discord.js/src/structures/ApplicationCommand.js
+++ b/packages/discord.js/src/structures/ApplicationCommand.js
@@ -441,6 +441,8 @@ class ApplicationCommand extends Base {
       (option.channelTypes ?? option.channel_types)?.length !== existing.channelTypes?.length ||
       (option.minValue ?? option.min_value) !== existing.minValue ||
       (option.maxValue ?? option.max_value) !== existing.maxValue ||
+      (option.minLength ?? option.min_length) !== existing.minLength ||
+      (option.maxLength ?? option.max_length) !== existing.maxLength ||
       !isEqual(option.nameLocalizations ?? option.name_localizations ?? {}, existing.nameLocalizations ?? {}) ||
       !isEqual(
         option.descriptionLocalizations ?? option.description_localizations ?? {},
@@ -509,6 +511,10 @@ class ApplicationCommand extends Base {
    * {@link ApplicationCommandOptionType.Number} option
    * @property {number} [maxValue] The maximum value for an {@link ApplicationCommandOptionType.Integer} or
    * {@link ApplicationCommandOptionType.Number} option
+   * @property {number} [minLength] The minimum length for an {@link ApplicationCommandOptionType.String} option
+   * (minimum of 0, maximum of `6000`)
+   * @property {number} [maxLength] The maximum length for an {@link ApplicationCommandOptionType.String} option
+   * (minimum of 1, maximum of `6000`)
    */
 
   /**
@@ -531,6 +537,8 @@ class ApplicationCommand extends Base {
     const channelTypesKey = received ? 'channelTypes' : 'channel_types';
     const minValueKey = received ? 'minValue' : 'min_value';
     const maxValueKey = received ? 'maxValue' : 'max_value';
+    const minLengthKey = received ? 'minLength' : 'min_length';
+    const maxLengthKey = received ? 'maxLength' : 'max_length';
     const nameLocalizationsKey = received ? 'nameLocalizations' : 'name_localizations';
     const nameLocalizedKey = received ? 'nameLocalized' : 'name_localized';
     const descriptionLocalizationsKey = received ? 'descriptionLocalizations' : 'description_localizations';
@@ -560,6 +568,8 @@ class ApplicationCommand extends Base {
       [channelTypesKey]: option.channelTypes ?? option.channel_types,
       [minValueKey]: option.minValue ?? option.min_value,
       [maxValueKey]: option.maxValue ?? option.max_value,
+      [minLengthKey]: option.minLength ?? option.min_length,
+      [maxLengthKey]: option.maxLength ?? option.max_length,
     };
   }
 }
diff --git a/packages/discord.js/typings/index.d.ts b/packages/discord.js/typings/index.d.ts
index f0a1369ec..47fe57ba8 100644
--- a/packages/discord.js/typings/index.d.ts
+++ b/packages/discord.js/typings/index.d.ts
@@ -3783,7 +3783,7 @@ export interface ApplicationCommandChoicesData extends Omit<BaseApplicationComma
 }
 
 export interface ApplicationCommandChoicesOption extends Omit<BaseApplicationCommandOptionsData, 'autocomplete'> {
-  type: Exclude<CommandOptionChoiceResolvableType, ApplicationCommandOptionType>;
+  type: CommandOptionChoiceResolvableType;
   choices?: ApplicationCommandOptionChoiceData[];
   autocomplete?: false;
 }
@@ -3796,12 +3796,26 @@ export interface ApplicationCommandNumericOptionData extends ApplicationCommandC
   max_value?: number;
 }
 
+export interface ApplicationCommandStringOptionData extends ApplicationCommandChoicesData {
+  type: ApplicationCommandOptionType.String;
+  minLength?: number;
+  min_length?: number;
+  maxLength?: number;
+  max_length?: number;
+}
+
 export interface ApplicationCommandNumericOption extends ApplicationCommandChoicesOption {
-  type: Exclude<CommandOptionNumericResolvableType, ApplicationCommandOptionType>;
+  type: CommandOptionNumericResolvableType;
   minValue?: number;
   maxValue?: number;
 }
 
+export interface ApplicationCommandStringOption extends ApplicationCommandChoicesOption {
+  type: ApplicationCommandOptionType.String;
+  minLength?: number;
+  maxLength?: number;
+}
+
 export interface ApplicationCommandSubGroupData extends Omit<BaseApplicationCommandOptionsData, 'required'> {
   type: ApplicationCommandOptionType.SubcommandGroup;
   options?: ApplicationCommandSubCommandData[];
@@ -3820,6 +3834,7 @@ export interface ApplicationCommandSubCommandData extends Omit<BaseApplicationCo
     | ApplicationCommandChannelOptionData
     | ApplicationCommandAutocompleteOption
     | ApplicationCommandNumericOptionData
+    | ApplicationCommandStringOptionData
   )[];
 }
 
@@ -3843,6 +3858,7 @@ export type ApplicationCommandOptionData =
   | ApplicationCommandChoicesData
   | ApplicationCommandAutocompleteOption
   | ApplicationCommandNumericOptionData
+  | ApplicationCommandStringOptionData
   | ApplicationCommandSubCommandData;
 
 export type ApplicationCommandOption =
@@ -3851,6 +3867,7 @@ export type ApplicationCommandOption =
   | ApplicationCommandChannelOption
   | ApplicationCommandChoicesOption
   | ApplicationCommandNumericOption
+  | ApplicationCommandStringOption
   | ApplicationCommandAttachmentOption
   | ApplicationCommandSubCommand;