diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index a70769e..2de1518 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -26,4 +26,5 @@ jobs:
         run: |
           pip install poetry
           poetry install --with dev
-          python -m pytest .
+          . ./.venv/bin/activate
+          pytest .
diff --git a/poetry.toml b/poetry.toml
new file mode 100644
index 0000000..53b35d3
--- /dev/null
+++ b/poetry.toml
@@ -0,0 +1,3 @@
+[virtualenvs]
+create = true
+in-project = true