diff --git a/.github/workflows/build-and-test.yml b/.github/workflows/build-and-test.yml
index 2fa3d48..6b39c3c 100644
--- a/.github/workflows/build-and-test.yml
+++ b/.github/workflows/build-and-test.yml
@@ -52,8 +52,8 @@ jobs:
           environment-file: environment.yml
           cache-downloads: true
           cache-environment: true
+          init-shell: bash powershell
       - name: Install & Test polyhedral-gravity
-        shell: bash -l {0}
         run: |
           pip install . -vv --no-build-isolation
           pytest -n 3