diff --git a/Cargo.toml b/Cargo.toml
index 114e517..0297231 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -2,6 +2,7 @@
 name = "epp-client"
 version = "0.6.0"
 edition = "2021"
+rust-version = "1.57"
 license = "MIT"
 description = "EPP (Extensible Provisioning Protocol) Client Library for Domain Registration and Management"
 repository = "https://github.com/masalachai/epp-client"