diff --git a/src/models/actions/update/UpdateUser.ts b/src/models/actions/update/UpdateUser.ts
index f130672..e5685eb 100644
--- a/src/models/actions/update/UpdateUser.ts
+++ b/src/models/actions/update/UpdateUser.ts
@@ -1,12 +1,14 @@
 import * as argon2 from "argon2";
+import { passwordStrength } from "check-password-strength";
 import { IsBoolean, IsEmail, IsInt, IsNotEmpty, IsOptional, IsPhoneNumber, IsString, IsUrl } from 'class-validator';
 import { getConnectionManager } from 'typeorm';
 import { config } from '../../../config';
-import { UserEmailNeededError, UsernameContainsIllegalCharacterError } from '../../../errors/UserErrors';
+import { PasswordMustContainLowercaseLetterError, PasswordMustContainNumberError, PasswordMustContainUppercaseLetterError, PasswordTooShortError, UserEmailNeededError, UsernameContainsIllegalCharacterError } from '../../../errors/UserErrors';
 import { UserGroupNotFoundError } from '../../../errors/UserGroupErrors';
 import { User } from '../../entities/User';
 import { UserGroup } from '../../entities/UserGroup';
 
+
 /**
  * This class is used to update a User entity (via put request).
  */
@@ -104,6 +106,11 @@ export class UpdateUser {
         if (this.username.includes("@")) { throw new UsernameContainsIllegalCharacterError(); }
 
         if (this.password) {
+            let password_strength = passwordStrength(this.password);
+            if (!password_strength.contains.includes("uppercase")) { throw new PasswordMustContainUppercaseLetterError(); }
+            if (!password_strength.contains.includes("lowercase")) { throw new PasswordMustContainLowercaseLetterError(); }
+            if (!password_strength.contains.includes("number")) { throw new PasswordMustContainNumberError(); }
+            if (!(password_strength.length > 9)) { throw new PasswordTooShortError(); }
             user.password = await argon2.hash(this.password + user.uuid);
             user.refreshTokenCount = user.refreshTokenCount + 1;
         }