Because of the Flynn Effect, IQ tests are periodically "renormed," which means you now need to do "better" on a test, relative to how the test was scored in the past, in order to receive a given IQ score.

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The Flynn Effect is a well-documented phenomenon of rising IQ scores over time due to improvements in environmental factors, such as nutrition and education. As a result, IQ tests are periodically renormed in order to keep the average score at 100 and maintain the validity of the test. This means that individuals must perform better on the test compared to previous test takers in order to receive the same IQ score.

Because of the Flynn Effect, IQ Tests Are Periodically "Renormed