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8 changes: 7 additions & 1 deletion src/poetry/utils/pip.py
Original file line number Diff line number Diff line change
Expand Up @@ -25,7 +25,13 @@ def pip_install(
# either the virtual environment or the virtualenv package embedded wheel. Version
# checks are a wasteful network call that adds a lot of wait time when installing a
# lot of packages.
args = ["install", "--disable-pip-version-check", "--prefix", str(environment.path)]
args = [
"install",
"--disable-pip-version-check",
"--isolated",
"--prefix",
str(environment.path),
]

if not is_wheel and not editable:
args.insert(1, "--use-pep517")
Expand Down