diff --git a/packages/common/package.json b/packages/common/package.json
index eaef71b40..505d30d5f 100644
--- a/packages/common/package.json
+++ b/packages/common/package.json
@@ -18,6 +18,7 @@
   },
   "license": "MIT",
   "dependencies": {
+    "file-type": "20.4.1",
     "iterare": "1.2.1",
     "tslib": "2.8.1",
     "uid": "2.0.2"
@@ -25,7 +26,6 @@
   "peerDependencies": {
     "class-transformer": "*",
     "class-validator": "*",
-    "file-type": "^20.4.1",
     "reflect-metadata": "^0.1.12 || ^0.2.0",
     "rxjs": "^7.1.0"
   },
@@ -35,9 +35,6 @@
     },
     "class-transformer": {
       "optional": true
-    },
-    "file-type": {
-      "optional": true
     }
   }
 }
diff --git a/packages/common/pipes/file/file-type.validator.ts b/packages/common/pipes/file/file-type.validator.ts
index 47139064f..767bac1e4 100644
--- a/packages/common/pipes/file/file-type.validator.ts
+++ b/packages/common/pipes/file/file-type.validator.ts
@@ -25,6 +25,19 @@ export class FileTypeValidator extends FileValidator<
   FileTypeValidatorOptions,
   IFile
 > {
+  constructor(validationOptions: FileTypeValidatorOptions) {
+    super(validationOptions);
+
+    // check if file-type is installed
+    try {
+      require.resolve('file-type');
+    } catch (e) {
+      throw new Error(
+        `FileTypeValidator requires the file-type package. Please install it: npm i file-type`,
+      );
+    }
+  }
+
   buildErrorMessage(file?: IFile): string {
     if (file?.mimetype) {
       return `Validation failed (current file type is ${file.mimetype}, expected type is ${this.validationOptions.fileType})`;
diff --git a/sample/01-cats-app/src/common/pipes/parse-int.pipe.ts b/sample/01-cats-app/src/common/pipes/parse-int.pipe.ts
index abc041424..51d9c197c 100644
--- a/sample/01-cats-app/src/common/pipes/parse-int.pipe.ts
+++ b/sample/01-cats-app/src/common/pipes/parse-int.pipe.ts
@@ -1,8 +1,8 @@
 import {
-  BadRequestException,
-  PipeTransform,
-  Injectable,
   ArgumentMetadata,
+  BadRequestException,
+  Injectable,
+  PipeTransform,
 } from '@nestjs/common';
 
 @Injectable()