According to the Topic No. 751 Social Security and Medicare Withholding Rates on the IRS website:
"The current tax rate for social security is 6.2% for the employer and 6.2% for the employee, or 12.4% total. The current rate for Medicare is 1.45% for the employer and 1.45% for the employee, or 2.9% total. Refer to Publication 15, (Circular E), Employer's Tax Guide for more information; or Publication 51, (Circular A), Agricultural Employer’s Tax Guide for agricultural employers. Refer to Notice 2020-65 and Notice 2021-11 for information allowing employers to defer withholding and payment of the employee's share of Social Security taxes of certain employees."