ERROR 1067 (42000) at line 30: Invalid default value for 'created_at' – Phpmyadmin

Deploying to Heroku and having trouble uploading an SQL export from phpMyAdmin

SQL Export Settings:

SET SQL_MODE = "NO_AUTO_VALUE_ON_ZERO";
START TRANSACTION;
SET time_zone = "+00:00";

Create Table

CREATE TABLE `posts` (
  `id` int(11) NOT NULL,
  `user_id` int(11) NOT NULL,
  `title` varchar(255) NOT NULL,
  `body` text NOT NULL,
  `created_at` datetime NOT NULL DEFAULT current_timestamp()
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

Error Message

ERROR 1067 (42000) at line 30: Invalid default value for 'created_at'

Using Step 11 from this tutorial on scotch.io

I feel like I am having issues with different versions of MySQL.