diff --git a/.github/workflows/build_tests.yml b/.github/workflows/build_tests.yml
index 2d912f2..3dc8601 100644
--- a/.github/workflows/build_tests.yml
+++ b/.github/workflows/build_tests.yml
@@ -69,7 +69,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        python-version: [3.7, 3.8, 3.9, 3.10, 3.11]
+        python-version: ['3.7', '3.8', '3.9', '3.10', '3.11']
         os: [ubuntu-latest]
     steps:
     - uses: actions/checkout@v2
@@ -107,7 +107,7 @@ jobs:
     - name: Set up Python 
       uses: actions/setup-python@v4
       with:
-        python-version: 3.8
+        python-version: 3.9
     - uses: actions/checkout@v2
     - name: Install coverage
       run: |