diff --git a/Cargo.toml b/Cargo.toml
index 580c458..1e107f7 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -13,7 +13,7 @@ categories = ["authentication", "web-programming"]
 
 [dependencies]
 serde = { version = "1.0", features = ["derive"] }
-ring = "0.16.12"
+ring = ">= 0.13"
 byteorder = "1.3.4"
 otpauth = "0.4.1"
 base32 = "0.4.0"