diff --git a/e2e/solid-start/serialization-adapters/package.json b/e2e/solid-start/serialization-adapters/package.json
index 2c63d8245fa..7969f090bd6 100644
--- a/e2e/solid-start/serialization-adapters/package.json
+++ b/e2e/solid-start/serialization-adapters/package.json
@@ -25,7 +25,6 @@
     "@tanstack/router-e2e-utils": "workspace:^",
     "@types/node": "^22.10.2",
     "postcss": "^8.5.1",
-    "seroval": "^1.3.2",
     "srvx": "^0.8.6",
     "tailwindcss": "^4.1.15",
     "typescript": "^5.7.2",
diff --git a/packages/router-core/package.json b/packages/router-core/package.json
index e00175745ad..0a64ac307f2 100644
--- a/packages/router-core/package.json
+++ b/packages/router-core/package.json
@@ -82,8 +82,8 @@
     "@tanstack/history": "workspace:*",
     "@tanstack/store": "^0.8.0",
     "cookie-es": "^2.0.0",
-    "seroval": "^1.3.2",
-    "seroval-plugins": "^1.3.2",
+    "seroval": "^1.4.0",
+    "seroval-plugins": "^1.4.0",
     "tiny-invariant": "^1.3.3",
     "tiny-warning": "^1.0.3"
   },
diff --git a/packages/router-core/src/ssr/serializer/ShallowErrorPlugin.ts b/packages/router-core/src/ssr/serializer/ShallowErrorPlugin.ts
index f0f160335c4..f3cc6290c88 100644
--- a/packages/router-core/src/ssr/serializer/ShallowErrorPlugin.ts
+++ b/packages/router-core/src/ssr/serializer/ShallowErrorPlugin.ts
@@ -38,6 +38,6 @@ export const ShallowErrorPlugin = /* @__PURE__ */ createPlugin<
     return 'new Error(' + ctx.serialize(node.message) + ')'
   },
   deserialize(node, ctx) {
-    return new Error(ctx.deserialize(node.message) as string)
+    return new Error(ctx.deserialize(node.message))
   },
 })
diff --git a/packages/start-client-core/package.json b/packages/start-client-core/package.json
index 92c4c25f26c..9f42011f792 100644
--- a/packages/start-client-core/package.json
+++ b/packages/start-client-core/package.json
@@ -81,7 +81,7 @@
   "dependencies": {
     "@tanstack/router-core": "workspace:*",
     "@tanstack/start-storage-context": "workspace:*",
-    "seroval": "^1.3.2",
+    "seroval": "^1.4.0",
     "tiny-invariant": "^1.3.3",
     "tiny-warning": "^1.0.3"
   }
diff --git a/packages/start-server-core/package.json b/packages/start-server-core/package.json
index e1dae0b99c7..79d7014ad35 100644
--- a/packages/start-server-core/package.json
+++ b/packages/start-server-core/package.json
@@ -80,7 +80,7 @@
     "@tanstack/start-client-core": "workspace:*",
     "@tanstack/start-storage-context": "workspace:*",
     "h3-v2": "npm:h3@2.0.0-beta.4",
-    "seroval": "^1.3.2",
+    "seroval": "^1.4.0",
     "tiny-invariant": "^1.3.3"
   },
   "devDependencies": {
diff --git a/packages/start-static-server-functions/package.json b/packages/start-static-server-functions/package.json
index 58840dd7f99..b95af06d95c 100644
--- a/packages/start-static-server-functions/package.json
+++ b/packages/start-static-server-functions/package.json
@@ -60,7 +60,7 @@
   },
   "dependencies": {
     "@tanstack/start-client-core": "workspace:*",
-    "seroval": "^1.3.2"
+    "seroval": "^1.4.0"
   },
   "peerDependencies": {
     "@tanstack/react-start": "workspace:*",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index d3bcefc68bd..34ada55be53 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -3343,9 +3343,6 @@ importers:
       postcss:
         specifier: ^8.5.1
         version: 8.5.6
-      seroval:
-        specifier: ^1.3.2
-        version: 1.3.2
       srvx:
         specifier: ^0.8.6
         version: 0.8.15
@@ -9416,11 +9413,11 @@ importers:
         specifier: ^2.0.0
         version: 2.0.0
       seroval:
-        specifier: ^1.3.2
-        version: 1.3.2
+        specifier: ^1.4.0
+        version: 1.4.0
       seroval-plugins:
-        specifier: ^1.3.2
-        version: 1.3.2(seroval@1.3.2)
+        specifier: ^1.4.0
+        version: 1.4.0(seroval@1.4.0)
       tiny-invariant:
         specifier: ^1.3.3
         version: 1.3.3
@@ -9897,8 +9894,8 @@ importers:
         specifier: workspace:*
         version: link:../start-storage-context
       seroval:
-        specifier: ^1.3.2
-        version: 1.3.2
+        specifier: ^1.4.0
+        version: 1.4.0
       tiny-invariant:
         specifier: ^1.3.3
         version: 1.3.3
@@ -10000,8 +9997,8 @@ importers:
         specifier: npm:h3@2.0.0-beta.4
         version: h3@2.0.0-beta.4(crossws@0.4.1(srvx@0.8.15))
       seroval:
-        specifier: ^1.3.2
-        version: 1.3.2
+        specifier: ^1.4.0
+        version: 1.4.0
       tiny-invariant:
         specifier: ^1.3.3
         version: 1.3.3
@@ -10028,8 +10025,8 @@ importers:
         specifier: workspace:*
         version: link:../start-client-core
       seroval:
-        specifier: ^1.3.2
-        version: 1.3.2
+        specifier: ^1.4.0
+        version: 1.4.0
 
   packages/start-storage-context:
     dependencies:
@@ -20010,10 +20007,20 @@ packages:
     peerDependencies:
       seroval: ^1.0
 
+  seroval-plugins@1.4.0:
+    resolution: {integrity: sha512-zir1aWzoiax6pbBVjoYVd0O1QQXgIL3eVGBMsBsNmM8Ukq90yGaWlfx0AB9dTS8GPqrOrbXn79vmItCUP9U3BQ==}
+    engines: {node: '>=10'}
+    peerDependencies:
+      seroval: ^1.0
+
   seroval@1.3.2:
     resolution: {integrity: sha512-RbcPH1n5cfwKrru7v7+zrZvjLurgHhGyso3HTyGtRivGWgYjbOmGuivCQaORNELjNONoK35nj28EoWul9sb1zQ==}
     engines: {node: '>=10'}
 
+  seroval@1.4.0:
+    resolution: {integrity: sha512-BdrNXdzlofomLTiRnwJTSEAaGKyHHZkbMXIywOh7zlzp4uZnXErEwl9XZ+N1hJSNpeTtNxWvVwN0wUzAIQ4Hpg==}
+    engines: {node: '>=10'}
+
   serve-index@1.9.1:
     resolution: {integrity: sha512-pXHfKNP4qujrtteMrSBb0rc8HJ9Ms/GrXwcUtUtD5s4ewDJI8bT3Cz2zTVRMKtri49pLx2e0Ya8ziP5Ya2pZZw==}
     engines: {node: '>= 0.8.0'}
@@ -32600,8 +32607,14 @@ snapshots:
     dependencies:
       seroval: 1.3.2
 
+  seroval-plugins@1.4.0(seroval@1.4.0):
+    dependencies:
+      seroval: 1.4.0
+
   seroval@1.3.2: {}
 
+  seroval@1.4.0: {}
+
   serve-index@1.9.1:
     dependencies:
       accepts: 1.3.8