diff --git a/.changeset/codemod-versions-from-manifests.md b/.changeset/codemod-versions-from-manifests.md
new file mode 100644
index 0000000000..b0383703ad
--- /dev/null
+++ b/.changeset/codemod-versions-from-manifests.md
@@ -0,0 +1,5 @@
+---
+'@modelcontextprotocol/codemod': patch
+---
+
+Read the v2 package versions the codemod writes into migrated `package.json` files directly from the workspace manifests at build time, replacing the committed generated `versions.ts` (which went stale after every release and made source builds write outdated versions).
diff --git a/packages/codemod/package.json b/packages/codemod/package.json
index 803053fb2c..f3c19675a6 100644
--- a/packages/codemod/package.json
+++ b/packages/codemod/package.json
@@ -41,8 +41,6 @@
     ],
     "scripts": {
         "typecheck": "tsgo -p tsconfig.json --noEmit",
-        "generate:versions": "tsx scripts/generateVersions.ts",
-        "prebuild": "pnpm run generate:versions",
         "build": "tsdown",
         "build:watch": "tsdown --watch",
         "prepack": "pnpm run build",
diff --git a/packages/codemod/scripts/generateVersions.ts b/packages/codemod/scripts/generateVersions.ts
deleted file mode 100644
index f4d827d76d..0000000000
--- a/packages/codemod/scripts/generateVersions.ts
+++ /dev/null
@@ -1,36 +0,0 @@
-import { readFileSync, writeFileSync } from 'node:fs';
-import path from 'node:path';
-import { fileURLToPath } from 'node:url';
-
-const __dirname = path.dirname(fileURLToPath(import.meta.url));
-const packagesDir = path.resolve(__dirname, '../..');
-
-const PACKAGE_DIRS: Record<string, string> = {
-    '@modelcontextprotocol/client': 'client',
-    '@modelcontextprotocol/server': 'server',
-    '@modelcontextprotocol/node': 'middleware/node',
-    '@modelcontextprotocol/express': 'middleware/express',
-    '@modelcontextprotocol/server-legacy': 'server-legacy',
-    '@modelcontextprotocol/core': 'core'
-};
-
-const versions: Record<string, string> = {};
-
-for (const [pkg, dir] of Object.entries(PACKAGE_DIRS)) {
-    const pkgJsonPath = path.join(packagesDir, dir, 'package.json');
-    const pkgJson = JSON.parse(readFileSync(pkgJsonPath, 'utf8'));
-    versions[pkg] = `^${pkgJson.version}`;
-}
-
-const entries = Object.entries(versions);
-const lines = entries.map(([pkg, ver], i) => `    '${pkg}': '${ver}'${i < entries.length - 1 ? ',' : ''}`).join('\n');
-
-const output = `// AUTO-GENERATED — do not edit. Run \`pnpm run generate:versions\` to regenerate.
-export const V2_PACKAGE_VERSIONS: Record<string, string> = {
-${lines}
-};
-`;
-
-const outPath = path.resolve(__dirname, '../src/generated/versions.ts');
-writeFileSync(outPath, output);
-console.log(`Wrote ${outPath}`);
diff --git a/packages/codemod/src/bin/batchTest.ts b/packages/codemod/src/bin/batchTest.ts
index 1a6802bc86..3d95fd23c5 100644
--- a/packages/codemod/src/bin/batchTest.ts
+++ b/packages/codemod/src/bin/batchTest.ts
@@ -6,10 +6,10 @@ import { tmpdir } from 'node:os';
 import path from 'node:path';
 import { fileURLToPath, pathToFileURL } from 'node:url';
 
-import { V2_PACKAGE_VERSIONS } from '../generated/versions';
 import { getMigration } from '../migrations/index';
 import { run } from '../runner';
 import type { Diagnostic, Migration } from '../types';
+import { V2_PACKAGE_VERSIONS } from '../versions';
 
 // ---------------------------------------------------------------------------
 // Types
diff --git a/packages/codemod/src/generated/versions.ts b/packages/codemod/src/generated/versions.ts
deleted file mode 100644
index a82d986db8..0000000000
--- a/packages/codemod/src/generated/versions.ts
+++ /dev/null
@@ -1,9 +0,0 @@
-// AUTO-GENERATED — do not edit. Run `pnpm run generate:versions` to regenerate.
-export const V2_PACKAGE_VERSIONS: Record<string, string> = {
-    '@modelcontextprotocol/client': '^2.0.0-beta.1',
-    '@modelcontextprotocol/server': '^2.0.0-beta.1',
-    '@modelcontextprotocol/node': '^2.0.0-beta.1',
-    '@modelcontextprotocol/express': '^2.0.0-beta.1',
-    '@modelcontextprotocol/server-legacy': '^2.0.0-beta.1',
-    '@modelcontextprotocol/core': '^2.0.0-beta.1'
-};
diff --git a/packages/codemod/src/utils/packageJsonUpdater.ts b/packages/codemod/src/utils/packageJsonUpdater.ts
index 0a03fc1e52..c543db452d 100644
--- a/packages/codemod/src/utils/packageJsonUpdater.ts
+++ b/packages/codemod/src/utils/packageJsonUpdater.ts
@@ -3,8 +3,8 @@ import path from 'node:path';
 
 import fg from 'fast-glob';
 
-import { V2_PACKAGE_VERSIONS } from '../generated/versions';
 import type { PackageJsonChange } from '../types';
+import { V2_PACKAGE_VERSIONS } from '../versions';
 import { findPackageJson } from './projectAnalyzer';
 
 const V1_PACKAGE = '@modelcontextprotocol/sdk';
diff --git a/packages/codemod/src/versions.ts b/packages/codemod/src/versions.ts
new file mode 100644
index 0000000000..64fae3a213
--- /dev/null
+++ b/packages/codemod/src/versions.ts
@@ -0,0 +1,20 @@
+import clientPkg from '../../client/package.json';
+import corePkg from '../../core/package.json';
+import expressPkg from '../../middleware/express/package.json';
+import nodePkg from '../../middleware/node/package.json';
+import serverPkg from '../../server/package.json';
+import serverLegacyPkg from '../../server-legacy/package.json';
+
+/**
+ * Caret ranges for the v2 packages the codemod writes into migrated package.json
+ * files. Versions come straight from the workspace manifests — the bundler inlines
+ * them at build time — so a release bump can never leave this map stale.
+ */
+export const V2_PACKAGE_VERSIONS: Record<string, string> = {
+    '@modelcontextprotocol/client': `^${clientPkg.version}`,
+    '@modelcontextprotocol/server': `^${serverPkg.version}`,
+    '@modelcontextprotocol/node': `^${nodePkg.version}`,
+    '@modelcontextprotocol/express': `^${expressPkg.version}`,
+    '@modelcontextprotocol/server-legacy': `^${serverLegacyPkg.version}`,
+    '@modelcontextprotocol/core': `^${corePkg.version}`
+};