diff --git a/action.yml b/action.yml
index 37d0c86..b7b1d1a 100644
--- a/action.yml
+++ b/action.yml
@@ -25,5 +25,8 @@ runs:
   using: "composite"
   steps: 
     - run: brew install -cask ngrok
+      shell: bash
     - run: ngrok authtoken ${{ inputs.ngrok_authtoken }}
-    - run: (ngrok ${{ inputs.protocol }} ${{ inputs.port }}) & sleep ${{ inputs.timeout }} ; kill $!
\ No newline at end of file
+      shell: bash
+    - run: (ngrok ${{ inputs.protocol }} ${{ inputs.port }}) & sleep ${{ inputs.timeout }} ; kill $!
+      shell: bash
\ No newline at end of file