The pressure of the gas increases.
Assuming that the volume and the amount of gas remain constant, increasing the temperature of the gas will cause the pressure of the gas to increase as well.
The temperature of the gas is simply a measure of how fast its molecules are moving. More specifically, the temperature of the gas tells you the average kinetic energy of its molecules.
When you increase the temperature, you essentially make the gas molecules move faster by providing them with more energy. As a result, the gas molecules will hit each other and the walls of the container with more force and more frequently.
The pressure of the gas is simply a measure of the force with which the gas molecules are hitting the walls of the container.
If the molecules are more energetic as a result of the increase in temperature, then they will indeed hit the walls of the container more often and with more force, which will cause the pressure of the gas to increase.
Therefore, you can say that when volume and number of moles of gas are kept constant, increasing the temperature of the gas will cause its pressure to increase as well