Consider a European call option on a stock currently trading at $50, with a strike price of $55 that expires in 6 months. The risk-free rate is 2%, and the underlying stock has an implied volatility of 30%. An analyst uses the Black-Scholes model to calculate the theoretical price of the option, which is found to be $2.50. Recently, the market price of this call option increased to $2.75. Given this information, determine the most appropriate inference regarding the implied volatility.