diff --git a/includes/class-debug.php b/includes/class-debug.php
index eba51fd..e90c338 100644
--- a/includes/class-debug.php
+++ b/includes/class-debug.php
@@ -31,23 +31,20 @@ private static function get_file_path() {
 	/**
 	 * Initializes the WordPress Filesystem.
 	 *
-	 * @return WP_Filesystem_Base|false The filesystem object or false on failure.
+	 * @return WP_Filesystem_Direct|false The filesystem object or false on failure.
 	 */
 	private static function init_filesystem() {
-		global $wp_filesystem;
-
-		if ( ! $wp_filesystem ) {
-			require_once ABSPATH . 'wp-admin/includes/file.php';
-			WP_Filesystem();
-		}
-
-		return $wp_filesystem;
+		require_once ABSPATH . 'wp-admin/includes/file.php';
+		require_once ABSPATH . 'wp-admin/includes/class-wp-filesystem-base.php';
+		require_once ABSPATH . 'wp-admin/includes/class-wp-filesystem-direct.php';
+		WP_Filesystem();
+		return new Filesystem_Direct( false );
 	}
 
 	/**
 	 * Checks the filesystem status and logs error to debug log.
 	 *
-	 * @param WP_Filesystem_Base $wp_filesystem The filesystem object.
+	 * @param WP_Filesystem_Direct $wp_filesystem The filesystem object.
 	 *
 	 * @return boolean true on success and false on failure.
 	 */
@@ -144,17 +141,11 @@ public static function log( $message, $type = 'string' ) {
 			) . PHP_EOL;
 
 			$file_path = self::get_file_path();
-
-			$content = '';
-			if ( $wp_filesystem->exists( $file_path ) ) {
-				if ( $wp_filesystem->is_readable( $file_path ) ) {
-					$content = $wp_filesystem->get_contents( $file_path );
-				}
-			}
 			$wp_filesystem->put_contents(
 				$file_path,
-				$formatted_message . $content,
-				FS_CHMOD_FILE
+				$formatted_message,
+				FS_CHMOD_FILE,
+				'a'
 			);
 		}
 	}
diff --git a/includes/class-filesystem-direct.php b/includes/class-filesystem-direct.php
new file mode 100644
index 0000000..61c9cb8
--- /dev/null
+++ b/includes/class-filesystem-direct.php
@@ -0,0 +1,57 @@
+<?php
+/**
+ * The Class for WordPress Direct Filesystem with optimized read and write routines.
+ *
+ * @package aspire-update
+ */
+
+namespace AspireUpdate;
+
+/**
+ * The Class for WordPress Direct Filesystem with optimized read and write routines.
+ */
+class Filesystem_Direct extends \WP_Filesystem_Direct {
+	/**
+	 * Write contents to a file with additional modes.
+	 *
+	 * @param string $file The path to the file.
+	 * @param string $contents The content to write.
+	 * @param int|false $mode     Optional. The file permissions as octal number, usually 0644.
+	 *                            Default false.
+	 * @param string $write_mode The write mode:
+	 *                     'w'  - Overwrite the file (default).
+	 *                     'a'  - Append to the file.
+	 *                     'x'  - Create a new file and write, fail if the file exists.
+	 *                     'c'  - Open the file for writing, but do not truncate.
+	 * @return bool True on success, false on failure.
+	 */
+	public function put_contents( $file, $contents, $mode = false, $write_mode = 'w' ) {
+		$valid_write_modes = [ 'w', 'a', 'x', 'c' ];
+		if ( ! in_array( $write_mode, $valid_write_modes, true ) ) {
+			return false;
+		}
+		$fp = @fopen( $file, $write_mode );
+
+		if ( ! $fp ) {
+			return false;
+		}
+
+		mbstring_binary_safe_encoding();
+
+		$data_length = strlen( $contents );
+
+		$bytes_written = fwrite( $fp, $contents );
+
+		reset_mbstring_encoding();
+
+		fclose( $fp );
+
+		if ( $data_length !== $bytes_written ) {
+			return false;
+		}
+
+		$this->chmod( $file, $mode );
+
+		return true;
+	}
+}