diff --git a/packages/esm-worker/package-lock.json b/packages/esm-worker/package-lock.json
index ac2161c33..e7c1b9089 100644
--- a/packages/esm-worker/package-lock.json
+++ b/packages/esm-worker/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "esm-worker",
-  "version": "0.120.0",
+  "version": "0.120.1",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "esm-worker",
-      "version": "0.120.0",
+      "version": "0.120.1",
       "license": "MIT",
       "devDependencies": {
         "@cloudflare/workers-types": "4.20230419.0",
diff --git a/packages/esm-worker/package.json b/packages/esm-worker/package.json
index b300365c2..48de17a92 100644
--- a/packages/esm-worker/package.json
+++ b/packages/esm-worker/package.json
@@ -1,7 +1,7 @@
 {
   "name": "esm-worker",
   "description": "A Cloudflare workers that handles all requests to the esm.sh origin server at the edge.",
-  "version": "0.120.0",
+  "version": "0.120.1",
   "type": "module",
   "module": "dist/index.js",
   "types": "types/index.d.ts",
diff --git a/packages/esm-worker/src/index.ts b/packages/esm-worker/src/index.ts
index 5d0ade450..655912bc4 100644
--- a/packages/esm-worker/src/index.ts
+++ b/packages/esm-worker/src/index.ts
@@ -130,7 +130,11 @@ class ESMWorker {
       }
     }
 
-    if (pathname === "/" || pathname.startsWith("/embed/")) {
+    if (
+      pathname === "/" ||
+      pathname === "/build" ||
+      pathname.startsWith("/embed/")
+    ) {
       return fetchServerOrigin(
         req,
         ctx,
@@ -408,13 +412,18 @@ class ESMWorker {
         const ua = req.headers.get("user-agent");
         target = getEsmaVersionFromUA(ua);
       }
-      headers.set("Cache-Control", "public, max-age=31536000, immutable");
+      const pined = hasBuildVerPrefix || hasBuildVerQuery;
+      if (pined) {
+        headers.set("Cache-Control", "public, max-age=31536000, immutable");
+      } else {
+        headers.set("Cache-Control", "public, max-age=86400");
+      }
       return redirect(
         new URL(
           `${prefix}/${pkg}@${packageVersion}/${target}/${packageName}.css`,
           url,
         ),
-        301,
+        pined ? 301 : 302,
         headers,
       );
     }
diff --git a/server/server_handler.go b/server/server_handler.go
index c4d2c04b2..038e3f074 100644
--- a/server/server_handler.go
+++ b/server/server_handler.go
@@ -1104,7 +1104,11 @@ func esmHandler() rex.Handle {
 				return rex.Status(404, "Package CSS not found")
 			}
 			url := fmt.Sprintf("%s%s/%s.css", cdnOrigin, cfg.BasePath, strings.TrimSuffix(taskID, path.Ext(taskID)))
-			return rex.Redirect(url, http.StatusMovedPermanently)
+			code := 302
+			if isPined {
+				code = 301
+			}
+			return rex.Redirect(url, code)
 		}
 
 		if isBarePath {