diff --git a/Cargo.toml b/Cargo.toml
index a1bd3462..42615cc8 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -36,7 +36,7 @@ once_cell = { version = "1.8.0", optional = true }
 base64 = { version = "0.13", optional = true }
 bytes = { version = "1.0", optional = true }
 reqwest = { version = "0.11", optional = true, default-features = false, features = ["json"] }
-headers = { version = "0.3", optional = true }
+headers = { version = "0.4", optional = true }
 ## WS
 # async-native-tls = { git = "https://github.com/async-email/async-native-tls.git", rev = "b5b5562d6cea77f913d4cbe448058c031833bf17", optional = true, default-features = false }
 # Temporarily use forked version released to crates.io