diff --git a/Cargo.toml b/Cargo.toml
index 29011f535..18e94ec8e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -9,7 +9,7 @@ homepage = "https://linkerd.io"
 repository = "https://github.com/linkerd/linkerd2-proxy-api"
 documentation = "https://docs.rs/linkerd2-proxy-api"
 keywords = ["linkerd", "grpc", "servicemesh"]
-rust-version = "1.59"
+rust-version = "1.90"
 
 [features]
 default = []