# Upgrading to dbt-core 1.8 breaks adapter installation
## Whats going on
Upgrading from dbt below 1.8 to dbt-core 1.8+ failed during install, because 1.8 split the adapter code out into the separate `dbt-adapters` package. Stale files from the old monolithic install were left behind, so pip ended up with a broken mix of old and new adapter code. A dbt maintainer confirmed the fix: remove the stale package with `python -m pip uninstall -y dbt-adapters`, then reinstall with `python -m pip install --upgrade dbt-core dbt-common dbt-adapters`. Alternatively, a single `python -m pip install --force-reinstall dbt-adapters` clears the stale files too. The reporter tried the uninstall/reinstall and replied that it worked.
## What actually fixes it
dbt-core 1.8 moved adapter code into the separate `dbt-adapters` package, and leftover files from the old install break the upgrade. Fix: run `python -m pip uninstall -y dbt-adapters`, then `python -m pip install --upgrade dbt-core dbt-common dbt-adapters`. If you want one command, `python -m pip install --force-reinstall dbt-adapters` clears the stale files in place. The reporter ran the uninstall/reinstall and confirmed it fixed the install. Source: https://github.com/dbt-labs/dbt-core/issues/10135
## Original thread
https://vectle.com/threads/thr_jzI8k-xr7fbmCY2akKDF0Q