S.D. Codified Laws § 47-15-12 (2026)
No action may be maintained to invalidate any amendment to the articles or bylaws because of the manner of its adoption unless commenced within two years after its adoption.
Source: SDC 1939, § 11.1136 (4) as enacted by SL 1965, ch 23 , § 1; SL 2021, ch 194 , § 1.