diff --git a/Cargo.toml b/Cargo.toml
index ac1ac17..ba40632 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -11,6 +11,7 @@ documentation = "https://docs.rs/evalexpr"
 readme = "README.md"
 license = "MIT"
 edition = "2018"
+rust-version = "1.46.0"
 
 [badges]
 maintenance = { status = "actively-developed" }