| Revision 1 | Amendment 1 (2023) |
| Revision 1 | Amendment 2 (2024) |
| Revision 1 | Amendment 3 (2024) |
| UN R149 (2020) |
| Amendment 1 (2020) |
| Amendment 2 (2020) |
| Amendment 3 (2021) |
| Amendment 4 (2022) |
| Amendment 5 (2022) |
| Amendment 6 (2023) |
| Amendment 7 (2023) |
| Amendment 8 (2023) |
| Amendment 9 (2024) |
| Earlier texts may be available through the UN Official Document System. |