V3 stops receiving security patches and bug fixes as of June 1, 2026; V4 migration is now mandatory for production workloads.
Summary
Staying on V3 leaves applications vulnerable to unpatched security flaws and incompatible with new AWS service features. Migration window is closing—delaying increases technical debt and risk exposure.
Why it matters
Staying on V3 leaves applications vulnerable to unpatched security flaws and incompatible with new AWS service features. Migration window is closing—delaying increases technical debt and risk exposure.
Implementation verdict
V3 → V4 is a forced upgrade. Requires reviewing breaking changes in migration guide, testing in dev first, then staged production rollout. Worth starting immediately if not already migrated; no business case for staying on V3.
Sources
Dev Signal
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