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/Cargo.lock b/Cargo.lock
index 528aca2..9f254b6 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -534,9 +534,9 @@ checksum = "1f3ccbac311fea05f86f61904b462b55fb3df8837a366dfc601a0161d0532f20"
 
 [[package]]
 name = "toml"
-version = "1.1.4+spec-1.1.0"
+version = "1.1.6+spec-1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3aace63f4bbcdfc2c965b059de67119c89c4017a70d633be6c104910f67056f5"
+checksum = "920602543f0911ab71da12c50d59701da54c196d1a2bf5cb4b75667f137a406a"
 dependencies = [
  "indexmap",
  "serde_core",