diff --git a/Cargo.toml b/Cargo.toml
index a984025..f8bf215 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -21,9 +21,9 @@ tls = ["rustls", "webpki", "webpki-roots"]
 cookies = ["cookie"]
 
 [dependencies]
-base64 = "0.11"
+base64 = "0.12"
 chunked_transfer = "1"
-cookie = { version = "0.12", features = ["percent-encode"], optional = true}
+cookie = { version = "0.13", features = ["percent-encode"], optional = true}
 lazy_static = "1"
 qstring = "0.7"
 url = "2"
diff --git a/src/request.rs b/src/request.rs
index 11a7c0c..09e8ee8 100644
--- a/src/request.rs
+++ b/src/request.rs
@@ -132,7 +132,7 @@ impl Request {
     /// ```
     #[cfg(feature = "json")]
     pub fn send_json(&mut self, data: SerdeValue) -> Response {
-        if let None = self.header("Content-Type") {
+        if self.header("Content-Type").is_none() {
             self.set("Content-Type", "application/json");
         }
         self.do_call(Payload::JSON(data))
diff --git a/src/response.rs b/src/response.rs
index 0055526..8db8fcb 100644
--- a/src/response.rs
+++ b/src/response.rs
@@ -718,11 +718,9 @@ mod tests {
     #[test]
     #[cfg(feature = "json")]
     fn parse_simple_json() {
-        let s = format!(
-            "HTTP/1.1 200 OK\r\n\
+        let s = "HTTP/1.1 200 OK\r\n\
              \r\n\
-             {{\"hello\":\"world\"}}"
-        );
+             {\"hello\":\"world\"}";
         let resp = s.parse::<Response>().unwrap();
         let v = resp.into_json().unwrap();
         let compare = "{\"hello\":\"world\"}"
diff --git a/src/stream.rs b/src/stream.rs
index 4d25896..74cf7b2 100644
--- a/src/stream.rs
+++ b/src/stream.rs
@@ -83,6 +83,7 @@ fn read_https(
     }
 }
 
+#[allow(deprecated)]
 fn is_close_notify(e: &std::io::Error) -> bool {
     if e.kind() != std::io::ErrorKind::ConnectionAborted {
         return false;