diff --git a/Cargo.toml b/Cargo.toml
index 64e3230..651e780 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -40,7 +40,7 @@ zeroize = { version = "1", default-features = false, features = ["zeroize_derive
 zkp = { version = "0.7" }
 
 [dev-dependencies]
-criterion = "*"
+criterion = { version = "0.3" }
 curve25519-dalek = { version = "2", default-features = false }
 rand = { version = "0.7" }
 
diff --git a/README.md b/README.md
index 7c0c489..11d4723 100644
--- a/README.md
+++ b/README.md
@@ -19,7 +19,7 @@ all the attributes on their credentials to the issuer when requesting a new
 credential.  When presenting said credential afterwards, attributes may be
 either hidden or revealed.
 
-Credentials may be either scalars (integers modulo the group order, a large
+Credential attributes may be either scalars (integers modulo the group order, a large
 prime) or group elements.  This library provides a way to encode arbitrary byte
 arrays to group elements---which may then be encrypted and decrypted---in an
 invertible manner, such that arbitrary strings can be stored as attributes.