diff --git a/Cargo.toml b/Cargo.toml
index 00ffa1d..a69c79f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -11,6 +11,7 @@ categories = ["external-ffi-bindings", "no-std", "os::windows-apis"]
 keywords = ["windows", "ffi", "ntapi", "native", "win32"]
 include = ["src/**/*", "Cargo.toml", "build.rs", "README.md", "LICENSE-APACHE", "LICENSE-MIT"]
 edition = "2018"
+rust-version = "1.64.0"
 
 [package.metadata.docs.rs]
 default-target = "x86_64-pc-windows-msvc"