diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 45da1b9f8..adff5d5a1 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -58,7 +58,7 @@ jobs:
       if: matrix.python-version == 'pypy3' || contains(matrix.env.TOXENV, 'pinned')
       run: |
         sudo apt-get update
-        sudo apt-get install libxml2-dev libxslt-dev
+        sudo apt-get install libxml2-dev libxslt-dev python2-dev
 
     - name: Run tests
       env: ${{ matrix.env }}