diff --git a/postgres-protocol/Cargo.toml b/postgres-protocol/Cargo.toml
index 6c26ac88..400956c1 100644
--- a/postgres-protocol/Cargo.toml
+++ b/postgres-protocol/Cargo.toml
@@ -13,7 +13,7 @@ base64 = "0.12"
 byteorder = "1.0"
 bytes = "0.5"
 fallible-iterator = "0.2"
-hmac = "0.8"
+hmac = "0.9"
 md5 = "0.7"
 memchr = "2.0"
 rand = "0.7"