diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index f18cb76..43d9e62 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -13,7 +13,7 @@ jobs:
         os: [ ubuntu-latest ]
         # FIXME macos garbage currently collect also nix-shell that runs the test
         #os: [ ubuntu-latest, macos-latest ]
-        variants: [ stable, unstable, bash4 ]
+        variants: [ stable, latest, bash4 ]
     runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v4
diff --git a/flake.lock b/flake.lock
index 68812e6..8cd411b 100644
--- a/flake.lock
+++ b/flake.lock
@@ -7,11 +7,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1712014858,
-        "narHash": "sha256-sB4SWl2lX95bExY2gMFG5HIzvva5AVMJd4Igm+GpZNw=",
+        "lastModified": 1714641030,
+        "narHash": "sha256-yzcRNDoyVP7+SCNX0wmuDju1NUCt8Dz9+lyUXEI0dbI=",
         "owner": "hercules-ci",
         "repo": "flake-parts",
-        "rev": "9126214d0a59633752a136528f5f3b9aa8565b7d",
+        "rev": "e5d10a24b66c3ea8f150e47dfdb0416ab7c3390e",
         "type": "github"
       },
       "original": {
@@ -22,11 +22,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1713687659,
-        "narHash": "sha256-Yd8KuOBpZ0Slau/NxFhMPJI0gBxeax0vq/FD0rqKwuQ=",
+        "lastModified": 1715037484,
+        "narHash": "sha256-OUt8xQFmBU96Hmm4T9tOWTu4oCswCzoVl+pxSq/kiFc=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "f2d7a289c5a5ece8521dd082b81ac7e4a57c2c5c",
+        "rev": "ad7efee13e0d216bf29992311536fce1d3eefbef",
         "type": "github"
       },
       "original": {
@@ -50,11 +50,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1711963903,
-        "narHash": "sha256-N3QDhoaX+paWXHbEXZapqd1r95mdshxToGowtjtYkGI=",
+        "lastModified": 1714058656,
+        "narHash": "sha256-Qv4RBm4LKuO4fNOfx9wl40W2rBbv5u5m+whxRYUMiaA=",
         "owner": "numtide",
         "repo": "treefmt-nix",
-        "rev": "49dc4a92b02b8e68798abd99184f228243b6e3ac",
+        "rev": "c6aaf729f34a36c445618580a9f95a48f5e4e03f",
         "type": "github"
       },
       "original": {
diff --git a/flake.nix b/flake.nix
index 64949fc..b1cdfb4 100644
--- a/flake.nix
+++ b/flake.nix
@@ -37,8 +37,8 @@
             test-runner-stable = pkgs.callPackage ./test-runner.nix {
               nixVersion = "stable";
             };
-            test-runner-unstable = pkgs.callPackage ./test-runner.nix {
-              nixVersion = "unstable";
+            test-runner-latest = pkgs.callPackage ./test-runner.nix {
+              nixVersion = "latest";
             };
           };