diff --git a/.github/workflows/check.yaml b/.github/workflows/check.yaml
index 60cc71a6..206564cb 100644
--- a/.github/workflows/check.yaml
+++ b/.github/workflows/check.yaml
@@ -1,4 +1,4 @@
-name: nix flake check
+name: nix flake
 
 on:
   push:
@@ -8,6 +8,18 @@ on:
   workflow_dispatch:
 
 jobs:
+  eval:
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v3
+      - uses: DeterminateSystems/nix-installer-action@main
+        with:
+          extra-conf: |
+            experimental-features = no-url-literals
+      - run: nix ${{ runner.debug && '--debug' }} flake check --impure --no-build --show-trace
+        env:
+          NIX_ABORT_ON_WARN: true
+
   check:
     runs-on: ubuntu-22.04
     steps:
diff --git a/flake.nix b/flake.nix
index bcaa57b7..3adabb07 100644
--- a/flake.nix
+++ b/flake.nix
@@ -139,6 +139,8 @@
                     domain = "invalid";
                     hostName = "options";
                   };
+
+                  system.stateVersion = "23.05";
                 }
               ]
               ++ attrValues self.nixosModules;
diff --git a/pkgs/by-name/mcaptcha/frontend-package.json b/pkgs/by-name/mcaptcha/frontend-package.json
index bb0d0fdd..c9598b87 100644
--- a/pkgs/by-name/mcaptcha/frontend-package.json
+++ b/pkgs/by-name/mcaptcha/frontend-package.json
@@ -2,7 +2,7 @@
   "name": "vanilla",
   "main": "index.js",
   "version": "1.0.0",
-  "license": "AGPL-3.0",
+  "license": "AGPL-3.0-or-later",
   "scripts": {
     "build": "webpack --mode production",
     "lint": "yarn run eslint templates",