diff --git a/config/postcss.config.js b/config/postcss.config.js
index 878d3869..88fc7e4e 100644
--- a/config/postcss.config.js
+++ b/config/postcss.config.js
@@ -64,7 +64,14 @@ const purgecss = purgeCSSPlugin({
       'search-input',
       // Bootstrap utilities used by SimpleDatatables
       'float-right',
-      'float-left'
+      'float-left',
+      // mod-simple-datatables hides the search input's label, which would otherwise repeat
+      // the input's own placeholder, by passing a `visually-hidden` span as the label text.
+      // That class therefore only ever appears inside the module's JavaScript, never in a
+      // layout, so hugo_stats.json cannot record it. Core layouts happen to emit it too, but
+      // only on pages that render a button, spinner or carousel - a site with none of those
+      // would purge the class and put the duplicated label back on screen.
+      'visually-hidden'
     ],
     // Classes with these patterns will be preserved along with their children
     deep: [
diff --git a/go.mod b/go.mod
index f43e821d..b5333592 100644
--- a/go.mod
+++ b/go.mod
@@ -14,7 +14,7 @@ require (
 	github.com/gethinode/mod-leaflet/v3 v3.1.3 // indirect
 	github.com/gethinode/mod-lottie/v3 v3.0.4 // indirect
 	github.com/gethinode/mod-mermaid/v5 v5.0.4 // indirect
-	github.com/gethinode/mod-simple-datatables/v4 v4.2.0 // indirect
+	github.com/gethinode/mod-simple-datatables/v4 v4.2.1 // indirect
 	github.com/gethinode/mod-utils/v6 v6.11.0 // indirect
 	github.com/nextapps-de/flexsearch v0.0.0-20260529083235-f7ed963096a0 // indirect
 	github.com/twbs/bootstrap v5.3.8+incompatible // indirect
diff --git a/go.sum b/go.sum
index ba0a77ca..1b43b435 100644
--- a/go.sum
+++ b/go.sum
@@ -42,6 +42,8 @@ github.com/gethinode/mod-simple-datatables/v4 v4.1.1 h1:Bidf8FA9SxBBb163D0yteTya
 github.com/gethinode/mod-simple-datatables/v4 v4.1.1/go.mod h1:irmXKx2jeppfpGRsCC91vN8dA4U2nQfy2eW8bajUeJo=
 github.com/gethinode/mod-simple-datatables/v4 v4.2.0 h1:n1GyPqVQ6o44awWIAiAwg/xZ6LYYQZuTQk6CuagboeI=
 github.com/gethinode/mod-simple-datatables/v4 v4.2.0/go.mod h1:bIYh9MBNdBe5vzSfmymqVzdVh+RSA7yPbMfnIayg8eo=
+github.com/gethinode/mod-simple-datatables/v4 v4.2.1 h1:Se1TIpqzOGcQVLZ2K8Ud7GuoEuVj/gk1zRqZ0jOR0UA=
+github.com/gethinode/mod-simple-datatables/v4 v4.2.1/go.mod h1:X9j8YEPhKWhcPCdylQHwfNkAqLH8L9878XcHQLyGEc8=
 github.com/gethinode/mod-utils/v6 v6.7.0 h1:DxqKUb13/6ydcntGIrUj1YD892VwarB8zGj+77CeUwM=
 github.com/gethinode/mod-utils/v6 v6.7.0/go.mod h1:E5tO9w3VKaidJpu1nI8zAKmh0bddFHOIIQnudAaXQTs=
 github.com/gethinode/mod-utils/v6 v6.8.0 h1:Rz/6DlPKVW0791jSsobxx4I4pKQ38H4JOEeOV+GeRzU=
diff --git a/package.json b/package.json
index fe58cdaa..69a53ebe 100644
--- a/package.json
+++ b/package.json
@@ -59,6 +59,7 @@
     "mod:vendor": "node scripts/mod-vendor.cjs",
     "mod:vendor:force": "rimraf _vendor && hugo mod vendor",
     "test": "npm-run-all lint test:templates",
+    "pretest:templates": "pnpm mod:vendor",
     "test:templates": "hugo -s tests/templates --logLevel error",
     "env": "hugo env",
     "precheck": "npm version",