diff --git a/.changeset/some-baths-change.md b/.changeset/some-baths-change.md
new file mode 100644
index 000000000000..784523ec6399
--- /dev/null
+++ b/.changeset/some-baths-change.md
@@ -0,0 +1,5 @@
+---
+'@sveltejs/adapter-vercel': patch
+---
+
+fix: avoid copying system packages when building on Vercel CI
diff --git a/packages/adapter-vercel/index.js b/packages/adapter-vercel/index.js
index d6213e554d4b..3d7477113f1c 100644
--- a/packages/adapter-vercel/index.js
+++ b/packages/adapter-vercel/index.js
@@ -710,7 +710,13 @@ async function create_function_bundle(builder, entry, dir, config) {
 	let base = entry;
 	while (base !== (base = path.dirname(base)));
 
-	const traced = await nodeFileTrace([entry], { base });
+	const is_vercel_build = !!process.env.VERCEL && entry.startsWith('/vercel/path0');
+
+	const traced = await nodeFileTrace([entry], {
+		base,
+		// TODO: remove this when https://github.com/vercel/nft/pull/568 is resolved
+		ignore: is_vercel_build ? (path) => !path.match(/^\/?vercel\/path0/) : undefined
+	});
 
 	/** @type {Map<string, string[]>} */
 	const resolution_failures = new Map();
diff --git a/packages/adapter-vercel/package.json b/packages/adapter-vercel/package.json
index ea7b1eea11ed..e639eb03d15f 100644
--- a/packages/adapter-vercel/package.json
+++ b/packages/adapter-vercel/package.json
@@ -40,7 +40,7 @@
 		"test": "vitest run"
 	},
 	"dependencies": {
-		"@vercel/nft": "^1.0.0",
+		"@vercel/nft": "^1.3.1",
 		"esbuild": "^0.25.4"
 	},
 	"devDependencies": {
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 78f269206a18..b5f718717aec 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -432,8 +432,8 @@ importers:
   packages/adapter-vercel:
     dependencies:
       '@vercel/nft':
-        specifier: ^1.0.0
-        version: 1.0.0(rollup@4.57.1)
+        specifier: ^1.3.1
+        version: 1.3.1(rollup@4.57.1)
       esbuild:
         specifier: ^0.25.4
         version: 0.25.12
@@ -3326,8 +3326,8 @@ packages:
     engines: {node: '>=18'}
     hasBin: true
 
-  '@vercel/nft@1.0.0':
-    resolution: {integrity: sha512-7pDSGV++fd3goikE2y9GkwKx9NPVOghBv2wD2YqQlcmfGkaPsWDdZMZNC7MyzUr37vZYgnfZZWZYVauJbm6KXw==}
+  '@vercel/nft@1.3.1':
+    resolution: {integrity: sha512-ihNT1rswiq3cy4WKQAV5kJi6UjWX1vLUzlLc+Vvq83G8CU9nMgfDWz5f1tOnSlS8LeC4Wp4qTB3+HGj/ccUrFQ==}
     engines: {node: '>=20'}
     hasBin: true
 
@@ -7888,7 +7888,7 @@ snapshots:
       - rollup
       - supports-color
 
-  '@vercel/nft@1.0.0(rollup@4.57.1)':
+  '@vercel/nft@1.3.1(rollup@4.57.1)':
     dependencies:
       '@mapbox/node-pre-gyp': 2.0.0
       '@rollup/pluginutils': 5.1.3(rollup@4.57.1)