diff --git a/.github/workflows/testing.yaml b/.github/workflows/testing.yaml
index d2ec4039..2976399f 100644
--- a/.github/workflows/testing.yaml
+++ b/.github/workflows/testing.yaml
@@ -20,6 +20,10 @@ on:
     - 'pyproject.toml'
     - '.github/workflows/testing.yaml'
 
+defaults:
+  run:
+    shell: bash # needed to prevent Windows from using PowerShell
+
 jobs:
   test:
     if: >