diff --git a/.github/workflows/github-ci.yml b/.github/workflows/github-ci.yml
index a94c2885..0abd83a8 100644
--- a/.github/workflows/github-ci.yml
+++ b/.github/workflows/github-ci.yml
@@ -15,7 +15,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v4
         with:
-          python-version: 3.11
+          python-version: 3.8.15
 
       - name: Upgrade pip
         run: python -m pip install --upgrade pip
@@ -39,8 +39,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        # temporarily downgraded to 3.7.9 and 3.8.10 due to a bug https://github.com/actions/setup-python/issues/402
-        python-version: ["3.8.10", "3.9.13", "3.10.9", "3.11.1", "3.12.0", "pypy3.9-v7.3.9"]
+        python-version: ["3.8.15", "3.9.13", "3.10.9", "3.11.1", "pypy3.9-v7.3.9"]
         os: [macos-11, macos-12, ubuntu-20.04, ubuntu-22.04, windows-2019, windows-2022]
         exclude:
           # temporarily exclude pypy3 on mac-os as there failing tests caused by bug on cbc side
@@ -48,9 +47,6 @@ jobs:
             python-version: "pypy3.9-v7.3.9"
           - os: macos-12
             python-version: "pypy3.9-v7.3.9"
-          # several version (3.7.9 and 3.8.10) at not available at ubuntu-22.04
-          - os: ubuntu-22.04
-            python-version: "3.8.10"
 
     steps: