diff --git a/.changeset/nine-rice-return.md b/.changeset/nine-rice-return.md
new file mode 100644
index 000000000..9c039a1f5
--- /dev/null
+++ b/.changeset/nine-rice-return.md
@@ -0,0 +1,5 @@
+---
+"@opennextjs/cloudflare": patch
+---
+
+Warn when using Next 16
diff --git a/packages/cloudflare/src/cli/build/build.ts b/packages/cloudflare/src/cli/build/build.ts
index 0a265995b..92a078c82 100644
--- a/packages/cloudflare/src/cli/build/build.ts
+++ b/packages/cloudflare/src/cli/build/build.ts
@@ -101,4 +101,7 @@ function ensureNextjsVersionSupported(options: buildHelper.BuildOptions) {
 		logger.error("Next.js version unsupported, please upgrade to version 14.2 or greater.");
 		process.exit(1);
 	}
+	if (buildHelper.compareSemver(options.nextVersion, ">=", "16")) {
+		logger.warn("Next.js 16 is not fully supported yet! Some features may not work as expected.");
+	}
 }