diff --git a/Cargo.toml b/Cargo.toml
index febdd1f0..307a1c04 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -48,7 +48,7 @@ slog-bunyan = "2.5"
 socket2 = { version = "0.5", features = ["all"] }
 ispf = { git = "https://github.com/oxidecomputer/ispf" }
 serde = { version = "1.0.207", features = ["derive"] }
-hostname = "0.3"
+hostname = "0.4"
 thiserror = "1.0"
 dropshot = { git = "https://github.com/oxidecomputer/dropshot", branch = "main" }
 schemars = { version = "0.8", features = [ "uuid1", "chrono" ] }