diff --git a/.github/workflows/docs-preview.yml b/.github/workflows/docs-preview.yml
index 97f9e4b..e9f274c 100644
--- a/.github/workflows/docs-preview.yml
+++ b/.github/workflows/docs-preview.yml
@@ -49,6 +49,12 @@ jobs:
     if: ${{ !cancelled() && github.event.pull_request.head.repo.full_name == github.repository && (github.event.action == 'closed' || needs.build.result == 'success') }}
     runs-on: ubuntu-latest
 
+    # Pages builds share gh-pages, so wait for each deployment before the next push.
+    concurrency:
+      group: rustdoc-preview-deploy
+      cancel-in-progress: false
+      queue: max
+
     permissions:
       actions: read
       contents: write
diff --git a/flake.lock b/flake.lock
index 072a21c..e8688d9 100644
--- a/flake.lock
+++ b/flake.lock
@@ -20,11 +20,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1787525875,
-        "narHash": "sha256-sKbMlkDCBVmAjUVT94LwhVtET/YEMtZaFdn5UduWxz8=",
+        "lastModified": 1790113641,
+        "narHash": "sha256-D2aaQetafdpHxbwA4ldAxs51UX0b11pXL+JL/5L8VrM=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "a3b98866eecd08edac6e61a3081e69540a35020f",
+        "rev": "1bc55b9def8165e82073919945c3239903fe4dc2",
         "type": "github"
       },
       "original": {