diff --git a/openssl/Cargo.toml b/openssl/Cargo.toml
index cd85d062..10d8ea4b 100644
--- a/openssl/Cargo.toml
+++ b/openssl/Cargo.toml
@@ -29,7 +29,7 @@ pkcs5_pbkdf2_hmac = ["openssl-sys/pkcs5_pbkdf2_hmac"]
 nightly = []
 
 [dependencies]
-bitflags = ">= 0.2, < 0.4"
+bitflags = "0.4"
 lazy_static = "0.1"
 libc = "0.2"
 openssl-sys = { version = "0.7.6", path = "../openssl-sys" }