diff --git a/Cargo.toml b/Cargo.toml
index 08318bc..7ceb851 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -8,6 +8,7 @@ readme = "README.md"
 homepage = "https://kdl.dev"
 repository = "https://github.com/kdl-org/kdl-rs"
 keywords = ["kdl", "document", "serialization", "config"]
+rust-version = "1.56.0"
 edition = "2021"
 
 [features]
diff --git a/clippy.toml b/clippy.toml
new file mode 100644
index 0000000..0d369b5
--- /dev/null
+++ b/clippy.toml
@@ -0,0 +1 @@
+msrv = "1.56.0"