diff --git a/invokeai/frontend/web/package.json b/invokeai/frontend/web/package.json
index 0bf236ee38..48bad31000 100644
--- a/invokeai/frontend/web/package.json
+++ b/invokeai/frontend/web/package.json
@@ -145,7 +145,6 @@
     "ts-toolbelt": "^9.6.0",
     "tsafe": "^1.6.6",
     "typescript": "^5.3.3",
-    "utility-types": "^3.11.0",
     "vite": "^5.1.3",
     "vite-plugin-css-injected-by-js": "^3.4.0",
     "vite-plugin-dts": "^3.7.2",
diff --git a/invokeai/frontend/web/pnpm-lock.yaml b/invokeai/frontend/web/pnpm-lock.yaml
index f2abdd87bf..d79d482d08 100644
--- a/invokeai/frontend/web/pnpm-lock.yaml
+++ b/invokeai/frontend/web/pnpm-lock.yaml
@@ -268,9 +268,6 @@ devDependencies:
   typescript:
     specifier: ^5.3.3
     version: 5.3.3
-  utility-types:
-    specifier: ^3.11.0
-    version: 3.11.0
   vite:
     specifier: ^5.1.3
     version: 5.1.3(@types/node@20.11.19)
@@ -14147,11 +14144,6 @@ packages:
       which-typed-array: 1.1.14
     dev: true
 
-  /utility-types@3.11.0:
-    resolution: {integrity: sha512-6Z7Ma2aVEWisaL6TvBCy7P8rm2LQoPv6dJ7ecIaIixHcwfbJ0x7mWdbcwlIM5IGQxPZSFYeqRCqlOOeKoJYMkw==}
-    engines: {node: '>= 4'}
-    dev: true
-
   /utils-merge@1.0.1:
     resolution: {integrity: sha512-pMZTvIkT1d+TFGvDOqodOclx0QWkkgi6Tdoa8gC8ffGAAqz9pzPTZWAybbsHHoED/ztMtkv/VoYTYyShUn81hA==}
     engines: {node: '>= 0.4.0'}
diff --git a/invokeai/frontend/web/src/services/api/types.ts b/invokeai/frontend/web/src/services/api/types.ts
index d561173337..6f6018d974 100644
--- a/invokeai/frontend/web/src/services/api/types.ts
+++ b/invokeai/frontend/web/src/services/api/types.ts
@@ -2,7 +2,6 @@ import type { UseToastOptions } from '@invoke-ai/ui-library';
 import type { EntityState } from '@reduxjs/toolkit';
 import type { components, paths } from 'services/api/schema';
 import type { O } from 'ts-toolbelt';
-import type { Overwrite } from 'utility-types';
 
 export type S = components['schemas'];
 
@@ -72,8 +71,8 @@ export type TextualInversionModelConfig = S['TextualInversionConfig'];
 export type DiffusersModelConfig = S['MainDiffusersConfig'];
 export type CheckpointModelConfig = S['MainCheckpointConfig'];
 export type MainModelConfig = DiffusersModelConfig | CheckpointModelConfig;
-export type RefinerMainModelConfig = Overwrite<MainModelConfig, { base: 'sdxl-refiner' }>;
-export type NonRefinerMainModelConfig = Overwrite<MainModelConfig, { base: 'any' | 'sd-1' | 'sd-2' | 'sdxl' }>;
+export type RefinerMainModelConfig = Omit<MainModelConfig, 'base'> & { base: 'sdxl-refiner' };
+export type NonRefinerMainModelConfig = Omit<MainModelConfig, 'base'> & { base: 'any' | 'sd-1' | 'sd-2' | 'sdxl' };
 export type AnyModelConfig =
   | LoRAModelConfig
   | VAEModelConfig