diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 69e7d6d..b4a5f76 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -29,20 +29,22 @@ jobs:
 
       - name: nix build ...
         run: |
-          echo 2_3
-          nix \
-          build \
-          --no-link \
-          --print-build-logs \
-          --print-out-paths \
-          github:NixOS/nixpkgs/90055d5e616bd943795d38808c94dbf0dd35abe8#pkgsStatic.nixVersions.nix_2_3
-          echo 2_4
-          nix \
-          build \
-          --no-link \
-          --print-build-logs \
-          --print-out-paths \
-          github:NixOS/nixpkgs/90055d5e616bd943795d38808c94dbf0dd35abe8#pkgsStatic.nixVersions.nix_2_4
+          # echo 2_3
+          # nix \
+          # build \
+          # --no-link \
+          # --print-build-logs \
+          # --print-out-paths \
+          # github:NixOS/nixpkgs/90055d5e616bd943795d38808c94dbf0dd35abe8#pkgsStatic.nixVersions.nix_2_3
+          echo 2_18
+          sha512sum $(
+            nix \
+            build \
+            --no-link \
+            --print-build-logs \
+            --print-out-paths \
+            github:NixOS/nixpkgs/90055d5e616bd943795d38808c94dbf0dd35abe8#pkgsStatic.nixVersions.nix_2_18
+          )/bin/nix
           # nix build --print-build-logs --print-out-paths github:NixOS/nix/20f04721492396570524509a9de45bc1e3a1524c#nix-static
           # nix build --rebuild --print-build-logs --print-out-paths github:NixOS/nix/20f04721492396570524509a9de45bc1e3a1524c#nix-static