Russia’s telecom and banking watchdogs are ramping up their efforts to keep international online gambling sites from reaching their Russian customers.

Russian telecom agency Roskomnadzor recently alerted the country’s internet service providers regarding plans to improve the agency’s notoriously ineffective domain-blocking mechanism. The new plan, which will kick in on October 1, will allow Roskomnadzor to enter domains into the forbidden registry using the Internet Protocol version 6 (IPv6).

Until now, Roskomnadzor’s blocking mechanism had relied on the previous IPv4 protocol, which was supplanted by IPv6 over a year ago. Roskomnadzor’s reliance on the old protocol allowed internationally licensed gambling sites to slip through the agency’s porous defenses.

The move follows the decision by MTS, Russia’s largest mobile operator, to roll out IPv6 across the country following a successful test in the Moscow district.