diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 8e2e266..2d6515c 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -45,6 +45,9 @@ jobs:
     name: Building ${{ inputs.dockerfile }}
     runs-on: [cw]
     container: 'ghcr.io/coreweave/github-actions-images/github-base-runner:v1.4.0'
+    defaults:
+      run:
+        shell: bash
     steps:
       - uses: actions/checkout@v4
       - name: Fetch BuildKit Client Certs