diff --git a/src/content/docs/en/reference/integrations-reference.mdx b/src/content/docs/en/reference/integrations-reference.mdx
index 226f73cbf1e33..0cabd7dcc4ecc 100644
--- a/src/content/docs/en/reference/integrations-reference.mdx
+++ b/src/content/docs/en/reference/integrations-reference.mdx
@@ -26,7 +26,7 @@ interface AstroIntegration {
       config: AstroConfig;
       command: 'dev' | 'build';
       isRestart: boolean;
-      updateConfig: (newConfig: Record<string, any>) => void;
+      updateConfig: (newConfig: DeepPartial<AstroConfig>) => AstroConfig;
       addRenderer: (renderer: AstroRenderer) => void;
       addWatchFile: (path: URL | string) => void;
       addClientDirective: (directive: ClientDirectiveConfig) => void;
@@ -72,7 +72,7 @@ interface AstroIntegration {
   config: AstroConfig;
   command: 'dev' | 'build';
   isRestart: boolean;
-  updateConfig: (newConfig: Record<string, any>) => void;
+  updateConfig: (newConfig: DeepPartial<AstroConfig>) => AstroConfig;
   addRenderer: (renderer: AstroRenderer) => void;
   addClientDirective: (directive: ClientDirectiveConfig) => void;
   addDevOverlayPlugin: (pluginEntrypoint: string) => void;
@@ -104,7 +104,7 @@ A read-only copy of the user-supplied [Astro config](/en/reference/configuration
 
 #### `updateConfig` option
 
-**Type:** `(newConfig: Record<string, any>) => void;`
+**Type:** `(newConfig: DeepPartial<AstroConfig>) => AstroConfig;`
 
 A callback function to update the user-supplied [Astro config](/en/reference/configuration-reference/). Any config you provide **will be merged with the user config + other integration config updates,** so you are free to omit keys!