thodg/totp-rs

diff --git a/Cargo.toml b/Cargo.toml
index 760f024..b70b5bd 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -21,8 +21,8 @@ serde_support = ["serde"]
 
 [dependencies]
 serde = { version = "1.0", features = ["derive"], optional = true }
-sha2 = "0.9.0"
-sha-1 = "0.9.0"
+sha2 = "0.9.5"
+sha-1 = "0.9.7"
 hmac = "0.8.0"
 byteorder = ">= 1.3"
 base32 = ">= 0.4"