diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 6d4b887..4ea79e6 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -218,8 +218,8 @@ jobs:
     strategy:
       matrix:
         versions:
-          - { nix-installer: "0.12.0", nix: "2.20.0" }
-          - { nix-installer: "0.14.0", nix: "2.20.0" }
+          - { nix-installer: "0.12.0", nix: "2.18.0" }
+          - { nix-installer: "0.14.0", nix: "2.18.1" }
           - { nix-installer: "0.18.0", nix: "2.20.0" }
     steps:
       - uses: actions/checkout@v4
@@ -234,4 +234,6 @@ jobs:
           if [ "${NIX_VERSION_OUTPUT}" != "${EXPECTED_OUTPUT}" ]; then
             echo "Nix version ${NIX_VERSION} didn't match expected version ${{ matrix.versions.nix }}"
             exit 1
+          else
+            echo "Success! Nix version ${NIX_VERSION} installed as expected"
           fi