selenium.common.exceptions.WebDriverException: Message: 'geckodriver-v0.26.0-linux64' executable may have wrong permissions on linux

from selenium import webdriver
browser = webdriver.Firefox(executable_path='./geckodriver-v0.26.0-linux64')
print(browser)

When I run this code my program is showing this error

selenium.common.exceptions.WebDriverException: Message: 'geckodriver-v0.26.0-linux64' executable may have wrong permissions.

I tried to execute the geckodriver but still it is not working,what should I do