diff --git a/.changeset/bump-seroval-1-7-0.md b/.changeset/bump-seroval-1-7-0.md
new file mode 100644
index 000000000..88ed5789b
--- /dev/null
+++ b/.changeset/bump-seroval-1-7-0.md
@@ -0,0 +1,5 @@
+---
+"@solidjs/start": patch
+---
+
+Bump `seroval` and `seroval-plugins` to 1.7.0.
diff --git a/packages/start/package.json b/packages/start/package.json
index 1b9b39c75..2ca544c9b 100644
--- a/packages/start/package.json
+++ b/packages/start/package.json
@@ -76,8 +76,8 @@
     "path-to-regexp": "^8.4.2",
     "pathe": "^2.0.3",
     "radix3": "^1.1.2",
-    "seroval": "^1.6.11",
-    "seroval-plugins": "^1.6.11",
+    "seroval": "^1.7.0",
+    "seroval-plugins": "^1.7.0",
     "shiki": "^4.3.1",
     "srvx": "^0.12.4",
     "terracotta": "^1.2.4",
diff --git a/packages/start/src/fns/serialization.ts b/packages/start/src/fns/serialization.ts
index 0ff67e4a5..89ebfff92 100644
--- a/packages/start/src/fns/serialization.ts
+++ b/packages/start/src/fns/serialization.ts
@@ -4,9 +4,9 @@ import {
   Feature,
   fromCrossJSON,
   getCrossReferenceHeader,
-  isStream,
   type Plugin,
   type SerovalNode,
+  Stream,
   toCrossJSONStream,
 } from "seroval";
 import {
@@ -346,8 +346,9 @@ class DecodedRefs extends Map<number, unknown> {
  * Fails every value still waiting on a frame that will not arrive. Seroval
  * keeps these in the refs between frames: open streams and pending-promise
  * resolvers (`{ p, s, f }`). `fromCrossJSON` builds streams from seroval's
- * internal `Stream` class, which only `isStream` recognizes; the eval-based
- * `deserialize` rebuilds them as plain `__SEROVAL_STREAM__` objects. Throwing
+ * `Stream` class; the eval-based `deserialize` rebuilds them as plain
+ * `__SEROVAL_STREAM__` objects. Decoding never builds a `LiveStream`, which
+ * `isStream` also matches, so `instanceof Stream` is the check. Throwing
  * into a closed stream and rejecting a settled promise are no-ops, so this is
  * safe to run after a body that ended normally.
  *
@@ -358,7 +359,7 @@ function settlePendingRefs(refs: Iterable<unknown>, error: unknown) {
     if (value === null || typeof value !== "object") continue;
     try {
       const ref = value as Record<string, any>;
-      if (isStream(ref)) {
+      if (ref instanceof Stream) {
         ref.throw(error);
       } else if (ref.__SEROVAL_STREAM__ === true && typeof ref.throw === "function") {
         ref.throw(error);
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 270fd1adf..d42649872 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -369,11 +369,11 @@ importers:
         specifier: ^1.1.2
         version: 1.1.2
       seroval:
-        specifier: ^1.6.11
-        version: 1.6.11
+        specifier: ^1.7.0
+        version: 1.7.0
       seroval-plugins:
-        specifier: ^1.6.11
-        version: 1.6.11(seroval@1.6.11)
+        specifier: ^1.7.0
+        version: 1.7.0(seroval@1.7.0)
       shiki:
         specifier: ^4.3.1
         version: 4.3.1
@@ -2839,9 +2839,9 @@ packages:
     peerDependencies:
       seroval: ^1.0
 
-  seroval-plugins@1.6.11:
-    resolution: {integrity: sha512-LmB3nd8pL39jKHKvnpTUjcjBtNwR8MLty/ydAR8qbfXt5j6/6KqR1atuw8cVmD2/lDxAkvAwq5tI/HsisD9Fqg==}
-    engines: {node: '>=10'}
+  seroval-plugins@1.7.0:
+    resolution: {integrity: sha512-WM4rArfPtLZriTuxC5DBvNulEwAaRcjNe/dkMOEesOcuvXf5nEwKf5Bw3AT92WHohqcc45+57GdtsCuBTI0mjw==}
+    engines: {node: '>=20'}
     peerDependencies:
       seroval: ^1.0
 
@@ -2849,9 +2849,9 @@ packages:
     resolution: {integrity: sha512-rVQVWjjSvlINzaQPZH5JFqsqEsIWdTxY3iJZCnTL/5gQbXIRooVZKI60tVCkOVfzcRPejboxO2t0P89dg5mQaA==}
     engines: {node: '>=10'}
 
-  seroval@1.6.11:
-    resolution: {integrity: sha512-hpb6XnMCGN/A+79Uf8V7/iTGkyyyazNn5X0CoCAp7Uy9vT3RT8jZ9GLcnxGoVjg3P8AArbe4ZVHq6C8oT2a0kA==}
-    engines: {node: '>=10'}
+  seroval@1.7.0:
+    resolution: {integrity: sha512-FU+LUkmDzWNsJ6oubZFN3dGPKny53DRhPJG6nftEaXDL8MIn19+kEE1Gvc+63Go+qPOwVUlKIdKhsu2HN6tksw==}
+    engines: {node: '>=20'}
 
   shebang-command@2.0.0:
     resolution: {integrity: sha512-kHxr2zZpYtdmrN1qDjrrX/Z1rR1kG8Dx+gkpK1G4eXmvXswmcE1hTWBWYUzlraYw1/yZp6YuDY77YtvbN0dmDA==}
@@ -5619,13 +5619,13 @@ snapshots:
     dependencies:
       seroval: 1.5.6
 
-  seroval-plugins@1.6.11(seroval@1.6.11):
+  seroval-plugins@1.7.0(seroval@1.7.0):
     dependencies:
-      seroval: 1.6.11
+      seroval: 1.7.0
 
   seroval@1.5.6: {}
 
-  seroval@1.6.11: {}
+  seroval@1.7.0: {}
 
   shebang-command@2.0.0:
     dependencies:
diff --git a/pnpm-workspace.yaml b/pnpm-workspace.yaml
index 623f8b6c2..fe3108a4b 100644
--- a/pnpm-workspace.yaml
+++ b/pnpm-workspace.yaml
@@ -19,8 +19,8 @@ minimumReleaseAgeExclude:
   - srvx@0.12.4
   - h3@2.0.1-rc.26
   - "@solidjs/router@1.0.0"
-  - seroval-plugins@1.6.11
-  - seroval@1.6.11
+  - seroval-plugins@1.7.0
+  - seroval@1.7.0
 
 onlyBuiltDependencies:
   - "@parcel/watcher"