diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index df3199f..4fbbd78 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -26,7 +26,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [ "3.7", "3.8", "3.9", "3.10" ]
+        python-version: [ "3.7.17", "3.8.18", "3.9.21", "3.10.16" ]
     steps:
       - name: Checkout
         uses: actions/checkout@v2