code · pull · Aug 21, 2026 · Aug 20, 2026 · Aug 20, 2026 · Aug 20, 2026
diff --git a/Cargo.lock b/Cargo.lock
diff --git a/Cargo.toml b/Cargo.toml
@@ -361,6 +361,7 @@ unsize = "1.1.0"
 unty = "0.0.4"
 url = "2.2.2"
 urlencoding = "2.1.2"
+windows-sys = "0.60"
 uuid = "1.18.1"
 vergen = { version = "9.0.6", features = ["cargo"] }
 vergen-gitcl = { version = "1.0.8", features = ["cargo"] }

diff --git a/crates/next-core/src/emit.rs b/crates/next-core/src/emit.rs
@@ -285,22 +285,14 @@ async fn assets_diff(
                 ),
             }
         }
-        (
-            AssetContent::Redirect {
-                target: target1,
-                link_type: link_type1,
-            },
-            AssetContent::Redirect {
-                target: target2,
-                link_type: link_type2,
-            },
-        ) => {
-            if target1 == target2 && link_type1 == link_type2 {
+        (AssetContent::Redirect(content1), AssetContent::Redirect(content2)) => {
+            if content1.target == content2.target && content1.target_type == content2.target_type {
                 None
             } else {
                 Some(format!(
-                    "assets at the same path are both redirects but point to different targets: \
-                     {target1} vs {target2}"
+                    "assets at the same path are both redirects but disagree: {:?} ({:?}) vs {:?} \
+                     ({:?})",
+                    content1.target, content1.target_type, content2.target, content2.target_type,
                 ))
             }
         }

diff --git a/crates/next-napi-bindings/src/next_api/project.rs b/crates/next-napi-bindings/src/next_api/project.rs
@@ -58,9 +58,11 @@ use turbo_tasks::{
     unmark_top_level_task_may_leak_eventually_consistent_state,
 };
 use turbo_tasks_backend::db_invalidation::invalidation_reasons;
+#[cfg(windows)]
+use turbo_tasks_fs::windows::to_verbatim_with_case_folded_disk;
 use turbo_tasks_fs::{
     DiskFileSystem, FileContent, FileSystem, FileSystemPath, canonicalize_to_rcstr, invalidation,
-    to_verbatim_with_case_folded_disk, util::uri_from_file,
+    util::uri_from_file,
 };
 use turbo_unix_path::{get_relative_path_to, unix_to_sys};
 use turbopack_core::{
@@ -2385,9 +2387,12 @@ fn parse_and_canonicalize_source_url(source_url: &str) -> Result<(RcStr, Option<
         Err(_) => {
             // The file may not exist (e.g. a stale stack frame). Fall back to a purely lexical
             // normalization that approximates the canonical format.
-            if cfg!(windows) {
+            #[cfg(windows)]
+            {
                 to_verbatim_with_case_folded_disk(&path).unwrap_or(path)
-            } else {
+            }
+            #[cfg(not(windows))]
+            {
                 path
             }
         }

diff --git a/docs/01-app/02-guides/self-hosting.mdx b/docs/01-app/02-guides/self-hosting.mdx
@@ -182,6 +182,8 @@ module.exports = {
 }
 ```
 
+> **Good to know:** When [`deploymentId`](/docs/app/api-reference/config/next-config-js/deploymentId) is set, Next.js uses a constant build ID and `generateBuildId` has no effect. [Version skew](#version-skew) is detected from the deployment ID instead.
+
 ## Multi-Server Deployments
 
 When running Next.js across multiple server instances (for example, containers behind a load balancer), there are additional considerations to ensure consistent behavior.

diff --git a/docs/01-app/03-api-reference/05-config/01-next-config-js/deploymentId.mdx b/docs/01-app/03-api-reference/05-config/01-next-config-js/deploymentId.mdx
@@ -68,12 +68,15 @@ module.exports = {
 }
 ```
 
+A per-deployment value only avoids skew if requests are also routed by deployment. Next.js does not route on `?dpl=`, so that routing comes from your host or CDN. Without it, clients that reach an instance from another deployment during a rollout will reload rather than navigate.
+
 ## Version History
 
-| Version    | Changes                                               |
-| ---------- | ----------------------------------------------------- |
-| `v14.1.4`  | `deploymentId` stabilized as top-level config option. |
-| `v13.4.10` | `experimental.deploymentId` introduced.               |
+| Version    | Changes                                                                                                                                       |
+| ---------- | --------------------------------------------------------------------------------------------------------------------------------------------- |
+| `v16.2.0`  | Pages Router detects version skew from the response header rather than the build ID, and the build ID is constant when `deploymentId` is set. |
+| `v14.1.4`  | `deploymentId` stabilized as top-level config option.                                                                                         |
+| `v13.4.10` | `experimental.deploymentId` introduced.                                                                                                       |
 
 ## Related
 

diff --git a/docs/01-app/03-api-reference/05-config/01-next-config-js/generateBuildId.mdx b/docs/01-app/03-api-reference/05-config/01-next-config-js/generateBuildId.mdx
@@ -17,3 +17,5 @@ module.exports = {
   },
 }
 ```
+
+> **Good to know:** When [`deploymentId`](/docs/app/api-reference/config/next-config-js/deploymentId) is set, Next.js uses a constant build ID and `generateBuildId` has no effect. [Version skew](/docs/app/guides/self-hosting#version-skew) is detected from the deployment ID instead.
diff --git a/lerna.json b/lerna.json
@@ -15,5 +15,5 @@
       "registry": "https://registry.npmjs.org/"
     }
   },
-  "version": "16.3.1-canary.25"
+  "version": "16.3.1-canary.26"
 }
diff --git a/packages/create-next-app/package.json b/packages/create-next-app/package.json
@@ -1,6 +1,6 @@
 {
   "name": "create-next-app",
-  "version": "16.3.1-canary.25",
+  "version": "16.3.1-canary.26",
   "keywords": [
     "react",
     "next",

diff --git a/packages/devlow-bench/package.json b/packages/devlow-bench/package.json
@@ -1,7 +1,7 @@
 {
   "name": "@vercel/devlow-bench",
   "private": true,
-  "version": "16.3.1-canary.25",
+  "version": "16.3.1-canary.26",
   "description": "Benchmarking tool for the developer workflow",
   "repository": {
     "type": "git",

diff --git a/packages/eslint-config-next/package.json b/packages/eslint-config-next/package.json
@@ -1,6 +1,6 @@
 {
   "name": "eslint-config-next",
-  "version": "16.3.1-canary.25",
+  "version": "16.3.1-canary.26",
   "description": "ESLint configuration used by Next.js.",
   "license": "MIT",
   "repository": {
@@ -12,7 +12,7 @@
     "dist"
   ],
   "dependencies": {
-    "@next/eslint-plugin-next": "16.3.1-canary.25",
+    "@next/eslint-plugin-next": "16.3.1-canary.26",
     "eslint-import-resolver-node": "^0.3.6",
     "eslint-import-resolver-typescript": "^3.5.2",
     "eslint-plugin-import": "^2.32.0",

diff --git a/packages/eslint-plugin-internal/package.json b/packages/eslint-plugin-internal/package.json
@@ -1,7 +1,7 @@
 {
   "name": "@next/eslint-plugin-internal",
   "private": true,
-  "version": "16.3.1-canary.25",
+  "version": "16.3.1-canary.26",
   "description": "ESLint plugin for working on Next.js.",
   "exports": {
     ".": "./src/eslint-plugin-internal.js"

diff --git a/packages/eslint-plugin-next/package.json b/packages/eslint-plugin-next/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@next/eslint-plugin-next",
-  "version": "16.3.1-canary.25",
+  "version": "16.3.1-canary.26",
   "description": "ESLint plugin for Next.js.",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",

diff --git a/packages/font/package.json b/packages/font/package.json
@@ -1,7 +1,7 @@
 {
   "name": "@next/font",
   "private": true,
-  "version": "16.3.1-canary.25",
+  "version": "16.3.1-canary.26",
   "repository": {
     "url": "vercel/next.js",
     "directory": "packages/font"

diff --git a/packages/next-bundle-analyzer/package.json b/packages/next-bundle-analyzer/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@next/bundle-analyzer",
-  "version": "16.3.1-canary.25",
+  "version": "16.3.1-canary.26",
   "main": "index.js",
   "types": "index.d.ts",
   "license": "MIT",

diff --git a/packages/next-codemod/package.json b/packages/next-codemod/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@next/codemod",
-  "version": "16.3.1-canary.25",
+  "version": "16.3.1-canary.26",
   "license": "MIT",
   "repository": {
     "type": "git",

diff --git a/packages/next-env/package.json b/packages/next-env/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@next/env",
-  "version": "16.3.1-canary.25",
+  "version": "16.3.1-canary.26",
   "keywords": [
     "react",
     "next",

diff --git a/packages/next-mdx/package.json b/packages/next-mdx/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@next/mdx",
-  "version": "16.3.1-canary.25",
+  "version": "16.3.1-canary.26",
   "main": "index.js",
   "license": "MIT",
   "repository": {

diff --git a/packages/next-playwright/package.json b/packages/next-playwright/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@next/playwright",
-  "version": "16.3.1-canary.25",
+  "version": "16.3.1-canary.26",
   "repository": {
     "url": "vercel/next.js",
     "directory": "packages/next-playwright"

diff --git a/packages/next-plugin-storybook/package.json b/packages/next-plugin-storybook/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@next/plugin-storybook",
-  "version": "16.3.1-canary.25",
+  "version": "16.3.1-canary.26",
   "repository": {
     "url": "vercel/next.js",
     "directory": "packages/next-plugin-storybook"

diff --git a/packages/next-polyfill-module/package.json b/packages/next-polyfill-module/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@next/polyfill-module",
-  "version": "16.3.1-canary.25",
+  "version": "16.3.1-canary.26",
   "description": "A standard library polyfill for ES Modules supporting browsers (Edge 16+, Firefox 60+, Chrome 61+, Safari 10.1+)",
   "main": "dist/polyfill-module.js",
   "license": "MIT",

diff --git a/packages/next-polyfill-nomodule/package.json b/packages/next-polyfill-nomodule/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@next/polyfill-nomodule",
-  "version": "16.3.1-canary.25",
+  "version": "16.3.1-canary.26",
   "description": "A polyfill for non-dead, nomodule browsers.",
   "main": "dist/polyfill-nomodule.js",
   "license": "MIT",

diff --git a/packages/next-routing/package.json b/packages/next-routing/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@next/routing",
-  "version": "16.3.1-canary.25",
+  "version": "16.3.1-canary.26",
   "keywords": [
     "react",
     "next",

diff --git a/packages/next-rspack/package.json b/packages/next-rspack/package.json
@@ -1,6 +1,6 @@
 {
   "name": "next-rspack",
-  "version": "16.3.1-canary.25",
+  "version": "16.3.1-canary.26",
   "repository": {
     "url": "vercel/next.js",
     "directory": "packages/next-rspack"

diff --git a/packages/next-swc/package.json b/packages/next-swc/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@next/swc",
-  "version": "16.3.1-canary.25",
+  "version": "16.3.1-canary.26",
   "private": true,
   "files": [
     "native/"

diff --git a/packages/next/package.json b/packages/next/package.json
@@ -1,6 +1,6 @@
 {
   "name": "next",
-  "version": "16.3.1-canary.25",
+  "version": "16.3.1-canary.26",
   "description": "The React Framework",
   "main": "./dist/server/next.js",
   "license": "MIT",
@@ -100,7 +100,7 @@
     ]
   },
   "dependencies": {
-    "@next/env": "16.3.1-canary.25",
+    "@next/env": "16.3.1-canary.26",
     "@swc/helpers": "0.5.23",
     "baseline-browser-mapping": "^2.9.19",
     "caniuse-lite": "^1.0.30001579",
@@ -164,11 +164,11 @@
     "@modelcontextprotocol/sdk": "1.18.1",
     "@mswjs/interceptors": "0.42.0",
     "@napi-rs/triples": "1.2.0",
-    "@next/font": "16.3.1-canary.25",
-    "@next/polyfill-module": "16.3.1-canary.25",
-    "@next/polyfill-nomodule": "16.3.1-canary.25",
-    "@next/react-refresh-utils": "16.3.1-canary.25",
-    "@next/swc": "16.3.1-canary.25",
+    "@next/font": "16.3.1-canary.26",
+    "@next/polyfill-module": "16.3.1-canary.26",
+    "@next/polyfill-nomodule": "16.3.1-canary.26",
+    "@next/react-refresh-utils": "16.3.1-canary.26",
+    "@next/swc": "16.3.1-canary.26",
     "@opentelemetry/api": "1.6.0",
     "@playwright/test": "1.61.0",
     "@rspack/core": "1.6.7",

diff --git a/packages/react-refresh-utils/package.json b/packages/react-refresh-utils/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@next/react-refresh-utils",
-  "version": "16.3.1-canary.25",
+  "version": "16.3.1-canary.26",
   "description": "An experimental package providing utilities for React Refresh.",
   "repository": {
     "url": "vercel/next.js",

diff --git a/packages/third-parties/package.json b/packages/third-parties/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@next/third-parties",
-  "version": "16.3.1-canary.25",
+  "version": "16.3.1-canary.26",
   "repository": {
     "url": "vercel/next.js",
     "directory": "packages/third-parties"
@@ -26,7 +26,7 @@
     "third-party-capital": "1.0.20"
   },
   "devDependencies": {
-    "next": "16.3.1-canary.25",
+    "next": "16.3.1-canary.26",
     "outdent": "0.8.0",
     "prettier": "2.5.1",
     "typescript": "6.0.2"

diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
diff --git a/test/development/fs-settling-event/fs-settling-event.test.ts b/test/development/fs-settling-event/fs-settling-event.test.ts
@@ -33,6 +33,7 @@ import path from 'path'
           () => {
             const output = stripAnsi(next.cliOutput.slice(outputIndex))
             expect(output).toContain('waiting for the filesystem to settle')
+            expect(output).toContain(pkgFile)
           },
           // The event fires after ~5s; allow a generous window to avoid flakes.
           15000,

diff --git a/turbopack/crates/turbo-tasks-fs/Cargo.toml b/turbopack/crates/turbo-tasks-fs/Cargo.toml
@@ -59,6 +59,11 @@ urlencoding = { workspace = true }
 
 [target.'cfg(windows)'.dependencies]
 omnipath = "0.1.6"
+windows-sys = { workspace = true, features = [
+  "Win32_Foundation",
+  "Win32_Storage_FileSystem",
+  "Win32_System_SystemServices",
+] }
 
 [dev-dependencies]
 criterion = { workspace = true, features = ["async_tokio"] }
@@ -68,4 +73,3 @@ sha2 = { workspace = true }
 tempfile = { workspace = true }
 turbo-tasks-testing = { workspace = true }
 turbo-tasks-backend = { workspace = true }
-
-Original file line number
+Diff line change
@@ Expand Up / @@ -182,6 +182,8 @@ module.exports = { @@
     }
     ```
+    > **Good to know:** When [`deploymentId`](/docs/app/api-reference/config/next-config-js/deploymentId) is set, Next.js uses a constant build ID and `generateBuildId` has no effect. [Version skew](#version-skew) is detected from the deployment ID instead.
     ## Multi-Server Deployments
     When running Next.js across multiple server instances (for example, containers behind a load balancer), there are additional considerations to ensure consistent behavior.
@@ Expand Down @@