diff --git a/Cargo.toml b/Cargo.toml
index 9b8d308..27c8d6e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -30,7 +30,7 @@ cookie = { version = "0.15", default-features = false, optional = true}
 once_cell = "1"
 url = "2"
 socks = { version = "0.3", optional = true }
-rustls = { version = "0.20", optional = true }
+rustls = { version = "0.20.1", optional = true }
 webpki = { version = "0.22", optional = true }
 webpki-roots = { version = "0.22", optional = true }
 rustls-native-certs = { version = "0.6", optional = true }
diff --git a/src/stream.rs b/src/stream.rs
index 0e5f29f..043a984 100644
--- a/src/stream.rs
+++ b/src/stream.rs
@@ -368,10 +368,9 @@ pub(crate) fn connect_https(unit: &Unit, hostname: &str) -> Result<Stream, Error
     let mut sock = connect_host(unit, hostname, port)?;
     let mut sess = rustls::ClientConnection::new(
         tls_conf,
-        rustls::ServerName::try_from(hostname).map_err(|_e| ErrorKind::Dns.new())?,
+        rustls::ServerName::try_from(hostname).map_err(|e| ErrorKind::Dns.new().src(e))?,
     )
     .map_err(|e| ErrorKind::Io.new().src(e))?;
-    // TODO rustls 0.20.1: Add src to ServerName error (0.20 didn't implement StdError trait for it)
 
     sess.complete_io(&mut sock)
         .map_err(|err| ErrorKind::ConnectionFailed.new().src(err))?;