diff --git a/.github/actions/fix-environment/action.yml b/.github/actions/fix-environment/action.yml
index 7a1fdd2377..c693828408 100644
--- a/.github/actions/fix-environment/action.yml
+++ b/.github/actions/fix-environment/action.yml
@@ -54,7 +54,7 @@ runs:
     # 1. Old mingw-w64-* binutils that prevent deterministic builds.
     # 2. Missing llvm-dlltool in the native Windows LLVM package.
     - name: Update packages
-      shell: bash
+      shell: pwsh
       run: |
-        pacman -S --noconfirm mingw-w64-x86_64-binutils
-        pacman -S --noconfirm mingw-w64-x86_64-llvm
+        C:\msys64\usr\bin\pacman.exe -S --noconfirm mingw-w64-x86_64-binutils
+        C:\msys64\usr\bin\pacman.exe -S --noconfirm mingw-w64-x86_64-llvm