diff --git a/.cirrus.yml b/.cirrus.yml
index e2341cdf4b7..4bffa8a3046 100644
--- a/.cirrus.yml
+++ b/.cirrus.yml
@@ -16,7 +16,7 @@ test_task:
   pip_script:
     - $PYTHON -m ensurepip
     - $PYTHON -m pip install -U pip tox
-    - $PYTHON -m pip install -U --pre poetry
+    - $PYTHON -m pip install --use-deprecated=legacy-resolver -U --pre poetry
     - poetry config virtualenvs.in-project true
   tox_script: $PYTHON -m tox -e py -- -q --junitxml=junit.xml tests
   on_failure: