1983 Mil Std 1815 published (Ada 83)
1987 ISO adopts Ada 83 standard unchanged as ISO/8652:1987
1995 Revision ISO/IEC 8652:1995 published (Ada 95)
2001 Technical Corrigendum 1 for Ada 95 (ISO/IEC 8652:1995/COR.1:2001) published
(A Technical Corrigendum provides bug fixes to a standard.)
2007 Amendment 1 to Ada 95 (ISO/IEC 8652:1995/AMD 1:2007) published (Ada 2005)
2016 Technical Corrigendum 1 for Ada 2012 (ISO/IEC 8652:2012/COR 1:2016) published
(A Technical Corrigendum provides bug fixes to a standard.) A Consolidated Standard [Ada 2012 with TC1 changes] is available.
ARA Press release for Technical Corrigendum 1
2021? Planned Revision to Ada 2012 A variety of new features, including additional forms of contracts and parallel execution features. New features already completed can be found in the draft Ada Standard (see Ada 202x pages).
2024?? Planned Technical Corrigendum for Ada 2021 (A Technical Corrigendum provides bug fixes to a standard.)
ISO/IEC JTC 1 SC 22 Working Group 9 (the group responsible for Ada Standards) is now using a more frequent schedule of updates, as in the modern world waiting 10 years for a major update is not acceptable. The plan is to produce some sort of (smaller) update to Ada roughly every three years, as well as using Technical Specifications to provide preview of major new proposals.