diff --git a/Cargo.toml b/Cargo.toml
index 7c3559da..6f782b74 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -5,7 +5,7 @@ license = "Apache-2.0"
 version = "0.2.9"
 authors = ["Colin Walters <walters@verbum.org>"]
 edition = "2021"
-rust-version = "1.66.0"
+rust-version = "1.70.0"
 
 # See https://github.com/coreos/cargo-vendor-filterer
 [package.metadata.vendor-filter]