Science is dynamic and there is change within the paradigm and with theories. Older ideas are rejected. As new evidence emerges, hypotheses and theories are rejected and modified. Actually, evolution is both fact and theory. A fact is a verifiable 'truth'.
Evolution is a fact.
Organisms have changed over time and will continue to change. Evolution is change or descent with modification. As a theory, evolution explains how and why things change over time. The theory of evolution elucidates the mechanisms of change. Hence, the theory of evolution is a tentative, modifiable, and falsifiable explanation of how organisms change over time.