diff --git a/Cargo.lock b/Cargo.lock
index 4f9a4a24b..90cf779b5 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -19,6 +19,12 @@ dependencies = [
  "byteorder",
 ]
 
+[[package]]
+name = "blobby"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fc52553543ecb104069b0ff9e0fcc5c739ad16202935528a112d974e8f1a4ee8"
+
 [[package]]
 name = "block-buffer"
 version = "0.9.0"
@@ -61,11 +67,11 @@ checksum = "8aebca1129a03dc6dc2b127edd729435bbc4a37e1d5f4d7513165089ceb02634"
 
 [[package]]
 name = "crypto-mac"
-version = "0.8.0"
+version = "0.9.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b584a330336237c1eecd3e94266efb216c56ed91225d634cb2991c5f3fd1aeab"
+checksum = "58bcd97a54c7ca5ce2f6eb16f6bede5b0ab5f0055fedc17d2f0b4466e21671ca"
 dependencies = [
- "blobby",
+ "blobby 0.3.0",
  "generic-array",
  "subtle",
 ]
@@ -76,7 +82,7 @@ version = "0.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d3dd60d1080a57a05ab032377049e0591415d2b31afd7028356dbf3cc6dcb066"
 dependencies = [
- "blobby",
+ "blobby 0.1.2",
  "generic-array",
 ]
 
diff --git a/blake2/Cargo.toml b/blake2/Cargo.toml
index 6e2d7cb70..7770fa2ac 100644
--- a/blake2/Cargo.toml
+++ b/blake2/Cargo.toml
@@ -13,12 +13,12 @@ categories = ["cryptography", "no-std"]
 
 [dependencies]
 digest = "0.9"
-crypto-mac = "0.8"
+crypto-mac = "0.9"
 opaque-debug = "0.3"
 
 [dev-dependencies]
 digest = { version = "0.9", features = ["dev"] }
-crypto-mac = { version = "0.8", features = ["dev"] }
+crypto-mac = { version = "0.9", features = ["dev"] }
 hex-literal = "0.2"
 
 [features]