diff --git a/.github/workflows/tests.yaml b/.github/workflows/tests.yaml
index dbf113299..ae001d8f5 100644
--- a/.github/workflows/tests.yaml
+++ b/.github/workflows/tests.yaml
@@ -472,6 +472,12 @@ jobs:
         run: |
           poetry run mpm --all-managers managers
 
+      # For some strange reasons pytest runs are complaining about missing packages on Windows.
+      - name: Force tomli_w installation - Windows
+        if: runner.os == 'Windows'
+        run: >
+          poetry run pip install tomli_w
+
       - name: Parallel non-destructive tests
         # XXX ./meta_package_manager/tests/ is specified at CLI level instead of using the ``testpaths`` parameter
         #   from pyproject.toml because of this bug: https://github.com/pytest-dev/pytest/issues/9311