diff --git a/packages/cloudflare/src/cli/build/build.ts b/packages/cloudflare/src/cli/build/build.ts
index 8b25ab88..bfcf726d 100644
--- a/packages/cloudflare/src/cli/build/build.ts
+++ b/packages/cloudflare/src/cli/build/build.ts
@@ -97,4 +97,13 @@ function ensureNextjsVersionSupported(options: buildHelper.BuildOptions) {
 		logger.error("Next.js version unsupported, please upgrade to version 14.2 or greater.");
 		process.exit(1);
 	}
+	// TODO: remove when 15.4 is supported
+	// Note: `e2e/experimental` is on 15.4.0-canary.14 which works
+	if (
+		!options.appPath.endsWith("opennextjs-cloudflare/examples/e2e/experimental") &&
+		buildHelper.compareSemver(options.nextVersion, ">=", "15.4.0")
+	) {
+		logger.error("Next.js version unsupported, the latest supported version is 15.3");
+		process.exit(1);
+	}
 }