diff --git a/azure-pipelines/release-pypi.yml b/azure-pipelines/release-pypi.yml
index 851f145..37df592 100644
--- a/azure-pipelines/release-pypi.yml
+++ b/azure-pipelines/release-pypi.yml
@@ -22,6 +22,7 @@ extends:
     pythonVersion: '3.7'
     # We don't ship any built in packages.
     generateNotice: false
+    pyProjectTomlPath: $(Build.SourcesDirectory)/packages/python/pyproject.toml
     buildSteps:
       - script: python -m pip install nox
         displayName: Install nox