diff --git a/.github/workflows/PackageTest.yml b/.github/workflows/PackageTest.yml
index 4e5c7fa..d6d1994 100644
--- a/.github/workflows/PackageTest.yml
+++ b/.github/workflows/PackageTest.yml
@@ -21,7 +21,7 @@ jobs:
       - name: Install poetry
         run: |
           pip install poetry
-          poetry env use python${{ matrix.python_version }}
+          poetry env use python${{ matrix.python-version }}
 
       - name: Install dependencies
         run: poetry install --with tests