# Psycopg 3.3.5

- Product: Psycopg (https://whatsnew.fyi/product/psycopg)
- Vendor: Psycopg
- Date: 2026-08-31
- Version: 3.3.5
- Original notes: https://pypi.org/project/psycopg/3.3.5/
- Permalink: https://whatsnew.fyi/product/psycopg/releases/3.3.5

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- **fixed** — Discard prepared statements upon ALTER * or DISCARD *
- **fixed** — Fix ProgrammingError when dumping non-None values with no NoneType dumper registered in python implementation
- **fixed** — Fix wait_selector wait function to not raise KeyError
- **fixed** — Fix DataError messages leaking the literal {...} placeholder instead of the offending value when loading a pre-year-1 timestamp or a malformed binary jsonb value
- **changed** — Raise DataError instead of ValueError when namedtuple_row receives duplicate column names
- **fixed** — Raise DataError on inconsistent copy data
- **fixed** — Handle client encodings aliases
- **fixed** — Fix building C extension with Cython 3.3

- Discard prepared statements upon ALTER * or DISCARD * (ticket #1307).
- Fix ProgrammingError when dumping non-None values with no NoneType dumper registered in python implementation (ticket #1325).
- Fix wait_selector wait function to not raise KeyError (ticket #1327).
- Fix DataError messages leaking the literal {...} placeholder instead of the offending value when loading a pre-year-1 timestamp or a malformed binary jsonb value (ticket #1372).
- Raise DataError instead of ValueError when namedtuple_row receives duplicate column names (ticket #1348).
- Raise DataError on inconsistent copy data (tickets #1359, #1360).
- Handle client encodings aliases (ticket #1363).
- Fix building C extension with Cython 3.3.