diff --git a/pagefind_ui/default/package-lock.json b/pagefind_ui/default/package-lock.json
index 0bb4328e..9b439a4b 100644
--- a/pagefind_ui/default/package-lock.json
+++ b/pagefind_ui/default/package-lock.json
@@ -13,10 +13,23 @@
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@@ -369,6 +382,60 @@
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+      "resolved": "https://registry.npmjs.org/@jridgewell/gen-mapping/-/gen-mapping-0.3.3.tgz",
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+      "resolved": "https://registry.npmjs.org/@jridgewell/resolve-uri/-/resolve-uri-3.1.0.tgz",
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+      "dev": true,
+      "engines": {
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+    "node_modules/@jridgewell/set-array": {
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+      "resolved": "https://registry.npmjs.org/@jridgewell/set-array/-/set-array-1.1.2.tgz",
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+      "resolved": "https://registry.npmjs.org/@jridgewell/sourcemap-codec/-/sourcemap-codec-1.4.15.tgz",
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+      "dev": true
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+    "node_modules/@jridgewell/trace-mapping": {
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+      "resolved": "https://registry.npmjs.org/@jridgewell/trace-mapping/-/trace-mapping-0.3.18.tgz",
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+      "resolved": "https://registry.npmjs.org/@jridgewell/sourcemap-codec/-/sourcemap-codec-1.4.14.tgz",
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@@ -404,6 +471,42 @@
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+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-8.10.0.tgz",
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+      "bin": {
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+      "resolved": "https://registry.npmjs.org/axobject-query/-/axobject-query-3.2.1.tgz",
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       "resolved": "https://registry.npmjs.org/bcp-47/-/bcp-47-2.1.0.tgz",
@@ -431,6 +534,41 @@
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+      "resolved": "https://registry.npmjs.org/code-red/-/code-red-1.0.3.tgz",
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+      "dev": true,
+      "dependencies": {
+        "@jridgewell/sourcemap-codec": "^1.4.14",
+        "@types/estree": "^1.0.0",
+        "acorn": "^8.8.2",
+        "estree-walker": "^3.0.3",
+        "periscopic": "^3.1.0"
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+    "node_modules/css-tree": {
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+      "resolved": "https://registry.npmjs.org/css-tree/-/css-tree-2.3.1.tgz",
+      "integrity": "sha512-6Fv1DV/TYw//QF5IzQdqsNDjx/wc8TrMBZsqjL9eW01tWb7R7k/mq+/VXfJCl7SoD5emsJop9cOByJZfs8hYIw==",
+      "dev": true,
+      "dependencies": {
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+        "source-map-js": "^1.0.1"
+      },
+      "engines": {
+        "node": "^10 || ^12.20.0 || ^14.13.0 || >=15.0.0"
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+    "node_modules/dequal": {
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/dequal/-/dequal-2.0.3.tgz",
+      "integrity": "sha512-0je+qPKHEMohvfRTCEo3CrPG6cAzAYgmzKyxRiYSSDkS6eGJdyVJm7WaYA5ECaAD9wLB2T4EEeymA5aFVcYXCA==",
+      "dev": true,
+      "engines": {
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@@ -490,6 +628,15 @@
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+      "resolved": "https://registry.npmjs.org/estree-walker/-/estree-walker-3.0.3.tgz",
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@@ -603,6 +750,39 @@
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+      "resolved": "https://registry.npmjs.org/is-reference/-/is-reference-3.0.1.tgz",
+      "integrity": "sha512-baJJdQLiYaJdvFbJqXrcGv3WU3QCzBlUcI5QhbesIm6/xPsvmO+2CDoi/GMOFBQEQm+PXkwOPrp9KK5ozZsp2w==",
+      "dev": true,
+      "dependencies": {
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+    "node_modules/locate-character": {
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+      "resolved": "https://registry.npmjs.org/locate-character/-/locate-character-3.0.0.tgz",
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+      "dev": true
+    },
+    "node_modules/magic-string": {
+      "version": "0.30.2",
+      "resolved": "https://registry.npmjs.org/magic-string/-/magic-string-0.30.2.tgz",
+      "integrity": "sha512-lNZdu7pewtq/ZvWUp9Wpf/x7WzMTsR26TWV03BRZrXFsv+BI6dy8RAiKgm1uM/kyR0rCfUcqvOlXKG66KhIGug==",
+      "dev": true,
+      "dependencies": {
+        "@jridgewell/sourcemap-codec": "^1.4.15"
+      },
+      "engines": {
+        "node": ">=12"
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+    },
+    "node_modules/mdn-data": {
+      "version": "2.0.30",
+      "resolved": "https://registry.npmjs.org/mdn-data/-/mdn-data-2.0.30.tgz",
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       "resolved": "https://registry.npmjs.org/merge2/-/merge2-1.4.1.tgz",
@@ -625,6 +805,17 @@
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+    "node_modules/periscopic": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/periscopic/-/periscopic-3.1.0.tgz",
+      "integrity": "sha512-vKiQ8RRtkl9P+r/+oefh25C3fhybptkHKCZSPlcXiJux2tJF55GnEj3BVn4A5gKfq9NWWXXrxkHBwVPUfH0opw==",
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+        "estree-walker": "^3.0.0",
+        "is-reference": "^3.0.0"
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     "node_modules/picomatch": {
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@@ -690,13 +881,37 @@
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       }
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+    "node_modules/source-map-js": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/source-map-js/-/source-map-js-1.0.2.tgz",
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+      "engines": {
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+      "dependencies": {
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+        "@jridgewell/sourcemap-codec": "^1.4.15",
+        "@jridgewell/trace-mapping": "^0.3.18",
+        "acorn": "^8.9.0",
+        "aria-query": "^5.3.0",
+        "axobject-query": "^3.2.1",
+        "code-red": "^1.0.3",
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+        "estree-walker": "^3.0.3",
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+        "locate-character": "^3.0.0",
+        "magic-string": "^0.30.0",
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+        "node": ">=16"
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     "node_modules/to-regex-range": {
@@ -726,6 +941,16 @@
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@@ -880,6 +1105,53 @@
       "dev": true,
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+      "resolved": "https://registry.npmjs.org/@jridgewell/gen-mapping/-/gen-mapping-0.3.3.tgz",
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+      "requires": {
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+        "@jridgewell/sourcemap-codec": "^1.4.10",
+        "@jridgewell/trace-mapping": "^0.3.9"
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+    "@jridgewell/resolve-uri": {
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+      "resolved": "https://registry.npmjs.org/@jridgewell/resolve-uri/-/resolve-uri-3.1.0.tgz",
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+    },
+    "@jridgewell/set-array": {
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+      "resolved": "https://registry.npmjs.org/@jridgewell/set-array/-/set-array-1.1.2.tgz",
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+      "dev": true,
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@@ -906,6 +1178,36 @@
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+      "resolved": "https://registry.npmjs.org/axobject-query/-/axobject-query-3.2.1.tgz",
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@@ -926,6 +1228,35 @@
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+      "requires": {
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+        "@types/estree": "^1.0.0",
+        "acorn": "^8.8.2",
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@@ -972,6 +1303,15 @@
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+      "requires": {
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+      "dev": true,
+      "requires": {
+        "@jridgewell/sourcemap-codec": "^1.4.15"
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+    "mdn-data": {
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+      "resolved": "https://registry.npmjs.org/mdn-data/-/mdn-data-2.0.30.tgz",
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@@ -1071,6 +1441,17 @@
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+      "resolved": "https://registry.npmjs.org/periscopic/-/periscopic-3.1.0.tgz",
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+        "estree-walker": "^3.0.0",
+        "is-reference": "^3.0.0"
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@@ -1098,12 +1479,33 @@
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+    "svelte": {
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+      "resolved": "https://registry.npmjs.org/svelte/-/svelte-4.1.2.tgz",
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+      "dev": true,
+      "requires": {
+        "@ampproject/remapping": "^2.2.1",
+        "@jridgewell/sourcemap-codec": "^1.4.15",
+        "@jridgewell/trace-mapping": "^0.3.18",
+        "acorn": "^8.9.0",
+        "aria-query": "^5.3.0",
+        "axobject-query": "^3.2.1",
+        "code-red": "^1.0.3",
+        "css-tree": "^2.3.1",
+        "estree-walker": "^3.0.3",
+        "is-reference": "^3.0.1",
+        "locate-character": "^3.0.0",
+        "magic-string": "^0.30.0",
+        "periscopic": "^3.1.0"
+      }
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     "to-regex-range": {
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diff --git a/pagefind_ui/default/package.json b/pagefind_ui/default/package.json
index f8691c3e..0820b894 100644
--- a/pagefind_ui/default/package.json
+++ b/pagefind_ui/default/package.json
@@ -15,7 +15,7 @@
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     "esbuild-plugin-import-glob": "^0.1.1",
     "esbuild-svelte": "^0.7.3",
-    "svelte": "^3.59.1",
+    "svelte": "^4.1.2",
     "typescript": "^5.1.3"
   },
   "files": [