diff --git a/node_modules/@zeabur/astro-adapter/dist/serverless/adapter.js b/node_modules/@zeabur/astro-adapter/dist/serverless/adapter.js
index c727bce..a2f379a 100644
--- a/node_modules/@zeabur/astro-adapter/dist/serverless/adapter.js
+++ b/node_modules/@zeabur/astro-adapter/dist/serverless/adapter.js
@@ -28,7 +28,8 @@ function getAdapter({
         supportKind: "stable",
         isSharpCompatible: true,
         isSquooshCompatible: true
-      }
+      },
+      envGetSecret: 'experimental',
     }
   };
 }
@@ -76,7 +77,10 @@ function vercelServerless({
           },
           vite: {
             ssr: {
-              external: ["@vercel/nft"]
+              external: [
+                "@vercel/nft",
+                ...((await shouldExternalizeAstroEnvSetup()) ? ['astro/env/setup'] : []),
+              ],
             }
           }
         });
@@ -188,6 +192,17 @@ async function createFunctionFolder({
     type: "module"
   });
 }
+
+// TODO: remove once we don't use a TLA anymore
+async function shouldExternalizeAstroEnvSetup() {
+	try {
+		await import('astro/env/setup');
+		return false;
+	} catch {
+		return true;
+	}
+}
+
 export {
   ASTRO_LOCALS_HEADER,
   VERCEL_EDGE_MIDDLEWARE_FILE,
diff --git a/node_modules/@zeabur/astro-adapter/dist/serverless/entrypoint.js b/node_modules/@zeabur/astro-adapter/dist/serverless/entrypoint.js
index 6eaac22..7e5b275 100644
--- a/node_modules/@zeabur/astro-adapter/dist/serverless/entrypoint.js
+++ b/node_modules/@zeabur/astro-adapter/dist/serverless/entrypoint.js
@@ -2,6 +2,13 @@ import { App } from "astro/app";
 import { applyPolyfills } from "astro/app/node";
 import { ASTRO_LOCALS_HEADER } from "./adapter.js";
 import { getRequest, setResponse } from "./request-transform.js";
+
+// Won't throw if the virtual module is not available because it's not supported in
+// the users's astro version or if astro:env is not enabled in the project
+await import('astro/env/setup')
+  .then((mod) => mod.setGetEnv((key) => process.env[key]))
+  .catch(() => {});
+
 applyPolyfills();
 const createExports = (manifest) => {
   const app = new App(manifest);