diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3de214458772..a8982c4b23ce 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,7 +9,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added
 
-- Upgrade: Automatically convert candidates with arbitrary values to their utilities ([#17831](https://github.com/tailwindlabs/tailwindcss/pull/17831))
+- Upgrade: Automatically convert candidates with arbitrary values to their utilities ([#17831](https://github.com/tailwindlabs/tailwindcss/pull/17831), [#17854](https://github.com/tailwindlabs/tailwindcss/pull/17854))
 
 ### Fixed
 
diff --git a/packages/@tailwindcss-upgrade/src/index.ts b/packages/@tailwindcss-upgrade/src/index.ts
index ed802a2e04d4..c6a7e2250845 100644
--- a/packages/@tailwindcss-upgrade/src/index.ts
+++ b/packages/@tailwindcss-upgrade/src/index.ts
@@ -283,6 +283,7 @@ async function run() {
         let scanner = new Scanner({ sources })
         let filesToMigrate = []
         for (let file of scanner.files) {
+          if (file.endsWith('.css')) continue
           if (seenFiles.has(file)) continue
           seenFiles.add(file)
           filesToMigrate.push(file)