diff --git a/Cargo.toml b/Cargo.toml
index 2336868e..66505539 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -15,7 +15,7 @@ keywords = ["serial", "hardware", "system", "RS232"]
 categories = ["hardware-support"]
 
 [target."cfg(unix)".dependencies]
-bitflags = ">=1.3.1, <2.1.0"
+bitflags = "1.3.1, 2.0.0"
 cfg-if = "1.0.0"
 nix = { version = "0.26", default-features = false, features = ["fs", "ioctl", "poll", "signal", "term"] }