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+# Migration
+
+ * `v1.x.x` to `v2.x.x`
+   * The MySQL schema has been changed from charset `utf8` to charset `utf8mb4` and from collation `utf8_general_ci` to collation `utf8mb4_unicode_ci`. Use the statements below to update the database schema:
+
+     ```sql
+     ALTER TABLE `users` CHANGE `email` `email` VARCHAR(249) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL;
+     ALTER TABLE `users_confirmations` CHANGE `email` `email` VARCHAR(249) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL;
+
+     -- ALTER DATABASE `<DATABASE_NAME>` CHARACTER SET = utf8mb4 COLLATE = utf8mb4_unicode_ci;
+
+     ALTER TABLE `users` CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
+     ALTER TABLE `users_confirmations` CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
+     ALTER TABLE `users_remembered` CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
+     ALTER TABLE `users_resets` CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
+     ALTER TABLE `users_throttling` CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
+
+     ALTER TABLE `users` CHANGE `email` `email` VARCHAR(249) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NOT NULL;
+     ALTER TABLE `users` CHANGE `username` `username` VARCHAR(100) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NULL DEFAULT NULL;
+
+     ALTER TABLE `users_confirmations` CHANGE `email` `email` VARCHAR(249) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NOT NULL;
+
+     ALTER TABLE `users_throttling` CHANGE `action_type` `action_type` ENUM('login','register','confirm_email') CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NOT NULL;
+
+     REPAIR TABLE users;
+     OPTIMIZE TABLE users;
+     REPAIR TABLE users_confirmations;
+     OPTIMIZE TABLE users_confirmations;
+     REPAIR TABLE users_remembered;
+     OPTIMIZE TABLE users_remembered;
+     REPAIR TABLE users_resets;
+     OPTIMIZE TABLE users_resets;
+     REPAIR TABLE users_throttling;
+     OPTIMIZE TABLE users_throttling;
+     ```