diff --git a/.github/workflows/python-package.yml b/.github/workflows/python-package.yml
index cb84ffb..7b50922 100644
--- a/.github/workflows/python-package.yml
+++ b/.github/workflows/python-package.yml
@@ -11,22 +11,19 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
-      matrix:
-        python-version: [3.7]
-
+    container:
+      image: python:3.7
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v2
-    - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v2
-      with:
-        python-version: ${{ matrix.python-version }}
+      uses: actions/checkout@v3
+    - name: Mark repo safe
+      run: git config --global --add safe.directory $GITHUB_WORKSPACE
     - name: Checkout submodules
       run: git submodule update --init --recursive 
     - name: Install dependencies
       run: |
-        sudo apt-get update
-        sudo apt-get install gcc gfortran openmpi-bin libopenmpi-dev cmake libhdf5-serial-dev libgsl-dev libcfitsio-dev
+        apt-get update
+        apt-get install -y gcc gfortran openmpi-bin libopenmpi-dev cmake libhdf5-serial-dev libgsl-dev libcfitsio-dev
     - name: Build CMC
       run: |
         mkdir build