diff --git a/.github/environment-windows.yml b/.github/environment-windows.yml
deleted file mode 100644
index b642e9c2..00000000
--- a/.github/environment-windows.yml
+++ /dev/null
@@ -1,10 +0,0 @@
-name:
-  test
-dependencies:
-  - fluidfft
-  - pyfftw
-  - fluiddyn
-  - pandas
-  - matplotlib
-  - pytest
-  - ipython
diff --git a/.github/workflows/ci-windows.yml b/.github/workflows/ci-windows.yml
index 04484f03..8e2bf857 100644
--- a/.github/workflows/ci-windows.yml
+++ b/.github/workflows/ci-windows.yml
@@ -16,18 +16,12 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
-    - uses: conda-incubator/setup-miniconda@v2
+    - uses: prefix-dev/setup-pixi@v0.4.1
       with:
-        environment-file: .github/environment-windows.yml
-        miniforge-variant: Mambaforge
-        miniforge-version: latest
-        activate-environment: test
-        use-mamba: true
-    - name: Install
-      run: |
-        pip install . -v
+        pixi-version: v0.11.1
+        cache: false
     - name: Tests
       run: |
-        python -m pip install pytest-allclose pytest-mock
-        python -m pip install "pymech @ git+https://github.com/eX-Mech/pymech.git"
-        pytest -v
+        pixi run install-editable
+        pixi run pytest ./fluidsim -v
+        # pixi run mpirun -np 2 pytest ./fluidsim -v --exitfirst