diff --git a/action.yml b/action.yml
index 654a3c1..9934f71 100644
--- a/action.yml
+++ b/action.yml
@@ -13,14 +13,20 @@ runs:
   steps:
     - name: Determine cargo bin directory
       run: echo "::set-output name=dir::$(dirname $(which cargo))"
+      shell: bash
       id: cargo
     - name: Download ${{inputs.bin || inputs.crate}}
       run: curl -o ${{steps.cargo.outputs.dir}}/${{inputs.bin || inputs.crate}} https://github.com/dtolnay/install/releases/download/${{inputs.crate}}/${{inputs.bin || inputs.crate}}
+      shell: bash
     - name: Download ${{inputs.bin || inputs.crate}}.sig
       run: curl -o ${{runner.temp}}/${{inputs.bin || inputs.crate}}.sig https://github.com/dtolnay/install/releases/download/${{inputs.crate}}/${{inputs.bin || inputs.crate}}.sig
+      shell: bash
     - name: Retrieve public key of signing key
       run: gpg --output ${{runner.temp}}/signing-key.gpg --dearmor ${{github.action_path}}/signing-key.asc
+      shell: bash
     - name: Verify gpg signature
       run: gpg --no-default-keyring --keyring ${{runner.temp}}/signing-key.gpg --verify ${{runner.temp}}/${{inputs.bin || inputs.crate}}.sig ${{steps.cargo.outputs.dir}}/${{inputs.bin || inputs.crate}}
+      shell: bash
     - name: Set executable bit
       run: chmod +x ${{steps.cargo.outputs.dir}}/${{inputs.bin || inputs.crate}}
+      shell: bash