diff --git a/Cargo.toml b/Cargo.toml
index 6f21f10..c6767aa 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -40,7 +40,7 @@ cookie_store = { version = "0.15", optional = true, default-features = false, fe
 log = "0.4"
 webpki = { version = "0.22", optional = true }
 webpki-roots = { version = "0.22", optional = true }
-rustls = { version = ">=0.20.1", optional = true }
+rustls = { version = "0.20.1", optional = true }
 rustls-native-certs = { version = "0.6", optional = true }
 native-tls = { version = "0.2", optional = true }
 flate2 = { version = "1.0.22", optional = true }