diff --git a/Cargo.toml b/Cargo.toml
index f98cd14..0c7c487 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,7 @@
 [package]
 name = "rustc_version"
 version = "0.4.1"
+rust-version = "1.32"
 license = "MIT OR Apache-2.0"
 description = "A library for querying the version of a installed rustc compiler"
 readme = "README.md"