diff --git a/.github/workflows/build_base_image.yml b/.github/workflows/build_base_image.yml
index a9eff3e..dd0eb85 100644
--- a/.github/workflows/build_base_image.yml
+++ b/.github/workflows/build_base_image.yml
@@ -16,8 +16,10 @@ jobs:
     - uses: actions/checkout@v2
 
     - name: Set image tag
+      shell: bash
       run: |
-        IFS=$'\n' read -d '' -r -a lines < .tool-versions
+        IFS=$'\n' 
+        read -d '' -r -a lines < .tool-versions
         erlang_line="${lines[0]}"
         ruby_line="${lines[1]}"
         echo $erlang_line