diff --git a/Cargo.toml b/Cargo.toml
index 02e6c23c..72c3b313 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -26,7 +26,7 @@ default = ["zmq_has"]
 zmq_has = []
 
 [dependencies]
-bitflags = "1.0"
+bitflags = "2.3"
 libc = "0.2.15"
 zmq-sys = { version = "0.12.0", path = "zmq-sys" }