A new era of hadron collisions will begin around 2030 with the High-Luminosity Large Hadron Collider (HL-LHC), which will enable the collection of up to ten times more data than was recorded during the first decade of LHC operations. This performance will be achieved through a substantial increase in instantaneous luminosity, at the cost of a significantly higher number of proton-proton collisions per bunch crossing. To withstand the expected high radiation doses and challenging data-taking conditions, the ATLAS Liquid Argon (LAr) Calorimeter readout electronics are being upgraded. Additionally, the trigger rate of the first level trigger is projected to be increased to ten times its current rate. The new trigger system must be provided with higher granularity up to cell-level for the energy reconstruction. This proceeding presents an overview of the new hardware systems, the status of their development and production, and the ongoing integration tests that are preparing the upgraded LAr readout for operation at the HL-LHC