diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 9f964a34..fae3c740 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -24,7 +24,9 @@ jobs:
       - uses: actions/setup-python@v1
         with:
           python-version: ${{ matrix.python }}
-      - run: python -m pip install --upgrade wheel poetry poethepoet
+      # Using fixed Poetry version until
+      # https://github.com/python-poetry/poetry/pull/7694 is fixed
+      - run: python -m pip install --upgrade wheel "poetry==1.4.0" poethepoet
       - run: poetry install --with pydantic
       - run: poe lint
       - run: poe test -s -o log_cli_level=DEBUG