diff --git a/postgres-protocol/Cargo.toml b/postgres-protocol/Cargo.toml
index 5d9c4f15..083f8dbf 100644
--- a/postgres-protocol/Cargo.toml
+++ b/postgres-protocol/Cargo.toml
@@ -13,10 +13,10 @@ base64 = "0.5"
 byteorder = "1.0"
 bytes = "0.4"
 fallible-iterator = "0.1"
-generic-array = "0.7"
-hmac = "0.1"
+generic-array = "0.8"
+hmac = "0.4"
 md5 = "0.3"
 memchr = "1.0"
 rand = "0.3"
-sha2 = "0.5"
+sha2 = "0.6"
 stringprep = "0.1"