It's grown quite a bit but the leaves are yellowing and turning brown around the edges.
If no apparent presence of pests, the most obvious reasons are cultural problems.
yellowing leaves are due to alkaline soil, excessive or inadequate watering, iron deficiency, leaf scorch, nitrogen deficiency or salt damage.
brown tips and edges of leaves are usually due to leaf scorch and/or salt damage.
One sure sign of inadequate watering is when the leaves curl downward to form something like hollow tubes of leaves. When watered adequately, the leaves should spread open [and flat].
If planted in direct sun, try to have some sort of shade by moving taller plants in containers around it; for salt damage, water the ginger heavily to leach the excess salt in the soil.
I have about 3 doz. gingers [white]in 2.5 gal. pots. They are happy being located in partial shade and with lots of water to drink.