How to upgrade Atreus' bow in God of War

sportskeeda.com:

God of War players can make use of Kratos' son, Atreus, and his Talon Bow in battle on the newly released PC version.

Most of the time, you will be swinging the Leviathan Axe to deal damage. However, Atreus can be a great help in tough fights, as his bow provides extra damage and ranged options.

Just like his father's Axe, Atreus' Talon Bow can reach a maximum level of six. It starts at level one, and there are five possible upgrades to the bow. Each increases arrow damage and costs Hacksilver and some Svartalfheim Steel.

Brok and Sindri are the two blacksmiths in God of War. In their shops, you can purchase items and do plenty of weapon upgrading. Either one of them will be able to upgrade Atreus' bow.

Atreus will use the Talon Bow after the first boss fight in "The Marked Trees." Once obtained, it can then be upgraded through Brok and Sundri, with upgrades available at different points in the game.

Here are all of the upgrades, how to acquire them, and when they become available:

Each upgrade allows new skills to be added to the Talon Bow in the skill tree by spending XP. As well, the final upgrade not only increases the bow's damage but allows for Runic Summons to fully recharge Atreus' quiver with arrows.