The development of executive functions in the preschool years is not fully understood. Although there exists a large body of research investigating the maturation of executive functioning in school-aged children, little is known about the emergence of such skills, in particular inhibition, among preschool-aged children. Understanding developmental changes of inhibition proficiencies and deficiencies early in childhood is important for charting typical and atypical developmental trajectories. Using an adapted computerized paradigm, the present study examined age-related changes in visual and auditory inhibition in 68 typically developing children aged 3 to 6years. The results indicated that although similar age-related gains in performance occurred across both visual and auditory inhibition tasks, certain modality-specific differences emerged in terms of accuracy and reaction time. These results suggest that the newly adapted measures used are sensitive enough to capture developmental variations in inhibition.