diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 9940d7c..e020d55 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -30,8 +30,8 @@ jobs:
       - uses: actions/checkout@v4
       - uses: CargoSense/setup-elixir-project@v1
         with:
-          otp-version: ${{ matrix.otp }}
-          elixir-version: ${{ matrix.elixir }}
+          otp-version: ${{ matrix.pair.otp }}
+          elixir-version: ${{ matrix.pair.elixir }}
           build-flags: "--warnings-as-errors"
       - run: mix format --check-formatted
       - run: mix test