diff --git a/Cargo.toml b/Cargo.toml
index 43b379f..c7d67dd 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -16,7 +16,7 @@ path = "lmdb-sys"
 version = "0.5.0"
 
 [dependencies]
-bitflags = "0.3"
+bitflags = "0.4"
 libc = "0.2"
 
 [dev-dependencies]