diff --git a/Cargo.toml b/Cargo.toml
index 0a159f9..f3aac1d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -16,7 +16,7 @@ ctr = "0.9"
 num-bigint = "0.4"
 num-traits = "0.2"
 num-integer = "0.1"
-hmac = "0.12"
+hmac = "0.13"
 sha2 = "0.10"
 hex = "0.4"
 serde = { version = "1.0", features = ["derive"] }