diff --git a/Cargo.toml b/Cargo.toml
index 385d2e4..f98f242 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "o2o"
-version = "0.4.9-alpha.2"
+version = "0.4.9-alpha.3"
 edition = "2021"
 authors = ["Artem Romanenia <artem.romanenia@gmail.com>"]
 categories = ["rust-patterns"]
diff --git a/src/lib.rs b/src/lib.rs
index 54da9ae..19a12b6 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,3 +1,5 @@
+#![no_std]
+
 #![doc = include_str!("../README.md")]
 
 #[cfg(feature = "macro")]