Here are a few options for a formal equivalent, depending on the level of precision you need:
Option 1 (Most standard and direct):
“Government to Amend Cyber Security Act”
Option 2 (More formal/bureaucratic):
“Proposed Amendments to the Cyber Security Act Announced by Government”
Option 3 (Action-oriented/Legalistic):
“Government Initiates Legislative Amendments to the Cyber Security Act”
Recommendation: If this is for a news headline or a formal report, Option 1 is the most professional and industry-standard choice.