diff --git a/CHANGELOG.md b/CHANGELOG.md
index c0022128f371..9b2c018b2477 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -23,6 +23,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Ensure JavaScript plugins that emit nested rules referencing to the utility name work as expected ([#16539](https://github.com/tailwindlabs/tailwindcss/pull/16539))
 - Upgrade: Report errors when updating dependencies ([#16504](https://github.com/tailwindlabs/tailwindcss/pull/16504))
 - Upgrade: Ensure a `darkMode` JS config setting with block syntax converts to use `@slot` ([#16507](https://github.com/tailwindlabs/tailwindcss/pull/16507))
+- Upgrade: Ensure to upgrade to the latest version of `tailwindcss` and `@tailwindcss/postcss` ([#16620](https://github.com/tailwindlabs/tailwindcss/pull/16620))
 
 ## [4.0.6] - 2025-02-10
 
diff --git a/integrations/upgrade/index.test.ts b/integrations/upgrade/index.test.ts
index 7fb857b31aec..1ba696cb3413 100644
--- a/integrations/upgrade/index.test.ts
+++ b/integrations/upgrade/index.test.ts
@@ -146,7 +146,7 @@ test(
     let packageJsonContent = await fs.read('package.json')
     let packageJson = JSON.parse(packageJsonContent)
     expect(packageJson.dependencies).toMatchObject({
-      tailwindcss: expect.stringContaining('4.0.0'),
+      tailwindcss: expect.stringMatching(/^\^4/),
     })
 
     // Ensure the v4 project compiles correctly
@@ -657,12 +657,12 @@ test(
     let packageJsonContent = await fs.read('package.json')
     let packageJson = JSON.parse(packageJsonContent)
     expect(packageJson.dependencies).toMatchObject({
-      tailwindcss: expect.stringContaining('4.0.0'),
+      tailwindcss: expect.stringMatching(/^\^4/),
     })
     expect(packageJson.dependencies).not.toHaveProperty('autoprefixer')
     expect(packageJson.dependencies).not.toHaveProperty('postcss-import')
     expect(packageJson.dependencies).toMatchObject({
-      '@tailwindcss/postcss': expect.stringContaining('4.0.0'),
+      '@tailwindcss/postcss': expect.stringMatching(/^\^4/),
     })
   },
 )
@@ -709,7 +709,7 @@ test(
     let packageJsonContent = await fs.read('package.json')
     let packageJson = JSON.parse(packageJsonContent)
     expect(packageJson.dependencies).toMatchObject({
-      '@tailwindcss/postcss': expect.stringContaining('4.0.0'),
+      '@tailwindcss/postcss': expect.stringMatching(/^\^4/),
     })
   },
 )
@@ -756,7 +756,7 @@ test(
     let packageJsonContent = await fs.read('package.json')
     let packageJson = JSON.parse(packageJsonContent)
     expect(packageJson.devDependencies).toMatchObject({
-      '@tailwindcss/postcss': expect.stringContaining('4.0.0'),
+      '@tailwindcss/postcss': expect.stringMatching(/^\^4/),
     })
   },
 )
@@ -824,12 +824,12 @@ test(
     `)
 
     expect(packageJson.dependencies).toMatchObject({
-      tailwindcss: expect.stringContaining('4.0.0'),
+      tailwindcss: expect.stringMatching(/^\^4/),
     })
     expect(packageJson.dependencies).not.toHaveProperty('autoprefixer')
     expect(packageJson.dependencies).not.toHaveProperty('postcss-import')
     expect(packageJson.dependencies).toMatchObject({
-      '@tailwindcss/postcss': expect.stringContaining('4.0.0'),
+      '@tailwindcss/postcss': expect.stringMatching(/^\^4/),
     })
   },
 )
@@ -901,12 +901,12 @@ test(
     let packageJsonContent = await fs.read('package.json')
     let packageJson = JSON.parse(packageJsonContent)
     expect(packageJson.dependencies).toMatchObject({
-      tailwindcss: expect.stringContaining('4.0.0'),
+      tailwindcss: expect.stringMatching(/^\^4/),
     })
     expect(packageJson.dependencies).not.toHaveProperty('autoprefixer')
     expect(packageJson.dependencies).not.toHaveProperty('postcss-import')
     expect(packageJson.dependencies).toMatchObject({
-      '@tailwindcss/postcss': expect.stringContaining('4.0.0'),
+      '@tailwindcss/postcss': expect.stringMatching(/^\^4/),
     })
   },
 )
diff --git a/packages/@tailwindcss-upgrade/src/index.ts b/packages/@tailwindcss-upgrade/src/index.ts
index 945b48ab42d9..9069b4ea84ba 100644
--- a/packages/@tailwindcss-upgrade/src/index.ts
+++ b/packages/@tailwindcss-upgrade/src/index.ts
@@ -276,7 +276,7 @@ async function run() {
 
   try {
     // Upgrade Tailwind CSS
-    await pkg(base).add(['tailwindcss@next'])
+    await pkg(base).add(['tailwindcss@latest'])
     success(`Updated package: ${highlight('tailwindcss')}`, { prefix: '↳ ' })
   } catch {}
 
diff --git a/packages/@tailwindcss-upgrade/src/migrate-postcss.ts b/packages/@tailwindcss-upgrade/src/migrate-postcss.ts
index 2804bae103ef..0d49c2ad2e4f 100644
--- a/packages/@tailwindcss-upgrade/src/migrate-postcss.ts
+++ b/packages/@tailwindcss-upgrade/src/migrate-postcss.ts
@@ -102,7 +102,7 @@ export async function migratePostCSSConfig(base: string) {
 
     if (location !== null) {
       try {
-        await pkg(base).add(['@tailwindcss/postcss@next'], location)
+        await pkg(base).add(['@tailwindcss/postcss@latest'], location)
         success(`Installed package: ${highlight('@tailwindcss/postcss')}`, { prefix: '↳ ' })
       } catch {}
     }