Understanding the Word 'Imperative'

In a recent article, the author discusses the importance of education reform. The author writes:

"In light of escalating challenges, it is imperative that we reimagine our educational systems. We must innovate to foster environments that nurture creativity and critical thinking in our youth. This is not merely a request for change; it is a necessity for our future. By embracing new methodologies and encouraging diverse learning styles, we can equip students with the skills they need to thrive in a rapidly evolving world."

What does the author imply by using the word "imperative" in this context?