diff --git a/packages/vant/src/calendar/types.ts b/packages/vant/src/calendar/types.ts
index 9afdf52f2..6d50cdbf7 100644
--- a/packages/vant/src/calendar/types.ts
+++ b/packages/vant/src/calendar/types.ts
@@ -39,7 +39,7 @@ export type CalendarMonthInstance = ComponentPublicInstance<
   CalendarMonthProps,
   {
     showed?: boolean;
-    getTitle: () => any;
+    getTitle: () => string;
     getHeight: () => number;
     setVisible: (value?: boolean | undefined) => void;
     scrollIntoView: (body: Element) => void;
diff --git a/packages/vant/src/toast/function-call.tsx b/packages/vant/src/toast/function-call.tsx
index 5566c39d2..b4998958d 100644
--- a/packages/vant/src/toast/function-call.tsx
+++ b/packages/vant/src/toast/function-call.tsx
@@ -139,9 +139,12 @@ Toast.clear = (all?: boolean) => {
 
 function setDefaultOptions(options: ToastOptions): void;
 function setDefaultOptions(type: ToastType, options: ToastOptions): void;
-function setDefaultOptions(type: ToastType | ToastOptions, options?: any) {
+function setDefaultOptions(
+  type: ToastType | ToastOptions,
+  options?: ToastOptions
+) {
   if (typeof type === 'string') {
-    defaultOptionsMap.set(type, options);
+    defaultOptionsMap.set(type, options!);
   } else {
     extend(currentOptions, type);
   }
diff --git a/packages/vant/src/utils/create.ts b/packages/vant/src/utils/create.ts
index 6295d0abc..182348e18 100644
--- a/packages/vant/src/utils/create.ts
+++ b/packages/vant/src/utils/create.ts
@@ -6,7 +6,7 @@ import locale from '../locale';
 export function createTranslate(name: string) {
   const prefix = camelize(name) + '.';
 
-  return (path: string, ...args: any[]): any => {
+  return (path: string, ...args: unknown[]): string => {
     const messages = locale.messages();
     const message = get(messages, prefix + path) || get(messages, path);
 
diff --git a/packages/vant/src/utils/deep-assign.ts b/packages/vant/src/utils/deep-assign.ts
index 30be7439d..c1619b16b 100644
--- a/packages/vant/src/utils/deep-assign.ts
+++ b/packages/vant/src/utils/deep-assign.ts
@@ -1,6 +1,6 @@
 import { isDef, isObject } from './validate';
 
-type ObjectIndex = Record<string, any>;
+type ObjectIndex = Record<string, unknown>;
 
 const { hasOwnProperty } = Object.prototype;
 
@@ -15,7 +15,7 @@ function assignKey(to: ObjectIndex, from: ObjectIndex, key: string) {
     to[key] = val;
   } else {
     // eslint-disable-next-line no-use-before-define
-    to[key] = deepAssign(Object(to[key]), from[key]);
+    to[key] = deepAssign(Object(to[key]), val);
   }
 }
 
diff --git a/packages/vant/src/utils/deep-clone.ts b/packages/vant/src/utils/deep-clone.ts
index b8f47a001..72cefb27c 100644
--- a/packages/vant/src/utils/deep-clone.ts
+++ b/packages/vant/src/utils/deep-clone.ts
@@ -1,4 +1,4 @@
-import { isDef } from './validate';
+import { isDef, isObject } from './validate';
 
 export function deepClone<T extends Record<string, any> | null | undefined>(
   obj: T
@@ -11,7 +11,7 @@ export function deepClone<T extends Record<string, any> | null | undefined>(
     return obj.map((item) => deepClone(item)) as unknown as T;
   }
 
-  if (typeof obj === 'object') {
+  if (isObject(obj)) {
     const to = {} as Record<string, any>;
     Object.keys(obj).forEach((key) => {
       to[key] = deepClone(obj[key]);
diff --git a/packages/vant/src/utils/interceptor.ts b/packages/vant/src/utils/interceptor.ts
index b3e5299db..41e26a230 100644
--- a/packages/vant/src/utils/interceptor.ts
+++ b/packages/vant/src/utils/interceptor.ts
@@ -1,7 +1,7 @@
 import { noop } from './basic';
 import { isPromise } from './validate';
 
-export type Interceptor = (...args: any[]) => Promise<boolean> | boolean;
+export type Interceptor = (...args: unknown[]) => Promise<boolean> | boolean;
 
 export function callInterceptor(
   interceptor: Interceptor | undefined,
@@ -10,7 +10,7 @@ export function callInterceptor(
     done,
     canceled,
   }: {
-    args?: any[];
+    args?: unknown[];
     done: () => void;
     canceled?: () => void;
   }
diff --git a/packages/vant/src/utils/with-install.ts b/packages/vant/src/utils/with-install.ts
index 48ecaf917..1cc6e864f 100644
--- a/packages/vant/src/utils/with-install.ts
+++ b/packages/vant/src/utils/with-install.ts
@@ -16,7 +16,7 @@ export type WithInstall<T> = T & {
 
 export function withInstall<T>(options: T) {
   (options as Record<string, unknown>).install = (app: App) => {
-    const { name } = options as any;
+    const { name } = options as unknown as { name: string };
     app.component(name, options);
     app.component(camelize(`-${name}`), options);
   };