diff --git a/.github/workflows/python-app.yml b/.github/workflows/python-app.yml
index b2ca244..6e6c97c 100644
--- a/.github/workflows/python-app.yml
+++ b/.github/workflows/python-app.yml
@@ -41,14 +41,18 @@ jobs:
 
     steps:
     - uses: actions/checkout@v6
+    - uses: cachix/install-nix-action@v31
+      if: ${{runner.os != 'Windows' }}
+      with:
+        nix_path: nixpkgs=channel:nixos-unstable
     - name: Install openEMS for linux
       if: ${{runner.os != 'Windows' }}
       run: |
-        sudo apt-get update
-        sudo apt-get install -y nix
-        sudo nix-channel --add https://nixos.org/channels/nixpkgs-unstable nixpkgs
-        sudo nix-channel --update
-        sudo nix-env -iA nixpkgs.openems
+        nix-channel --list
+        nix-channel --add https://nixos.org/channels/nixpkgs-unstable nixpkgs
+        nix-channel --update
+        nix-env -iA nixpkgs.openems
+        which openEMS
     - name: Install uv
       uses: astral-sh/setup-uv@v7
     - name: Set up Python