diff --git a/Cargo.toml b/Cargo.toml
index 433d823..90e9b40 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -29,8 +29,7 @@ nom = { version = "6", optional = true }
 criterion = "0.3"
 futures-executor = "0.3.4"
 hex = "0.4"
-rand = "0.7"
-quickcheck = "0.9"
+quickcheck = "1"
 
 [[bench]]
 name = "benchmark"
diff --git a/src/codec.rs b/src/codec.rs
index 1576a88..606dcc0 100644
--- a/src/codec.rs
+++ b/src/codec.rs
@@ -103,7 +103,7 @@ pub struct UviBytes<T = Bytes> {
     varint_codec: Uvi<usize>,
     /// number of bytes expected in the current frame (for decoding only)
     len: Option<usize>,
-    // maximum permitted number of bytes per frame
+    /// maximum permitted number of bytes per frame
     max: usize,
     _ty: PhantomData<T>
 }
diff --git a/tests/identity.rs b/tests/identity.rs
index 2924de7..1d31b43 100644
--- a/tests/identity.rs
+++ b/tests/identity.rs
@@ -105,7 +105,7 @@ fn various() {
 #[test]
 fn identity_codec() {
     use bytes::{Bytes, BytesMut};
-    use quickcheck::StdThreadGen;
+    use quickcheck::Gen;
     use tokio_util::codec::{Encoder, Decoder};
     use unsigned_varint::codec::UviBytes;
 
@@ -118,7 +118,7 @@ fn identity_codec() {
         input == codec.decode(&mut buffer).expect("Ok").expect("Some").freeze()
     }
 
-    QuickCheck::with_gen(StdThreadGen::new(512 * 1024))
+    QuickCheck::new().gen(Gen::new(512 * 1024))
         .quickcheck(prop as fn(Vec<u8>) -> bool)
 }
 
diff --git a/tests/io.rs b/tests/io.rs
index 3ed5624..1ca9f33 100644
--- a/tests/io.rs
+++ b/tests/io.rs
@@ -18,7 +18,6 @@
 // CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 use quickcheck::{Arbitrary, Gen};
-use rand::Rng;
 use unsigned_varint::encode;
 
 #[cfg(feature = "std")]
@@ -107,8 +106,8 @@ impl RandomUvi {
 }
 
 impl Arbitrary for RandomUvi {
-    fn arbitrary<G: Gen>(g: &mut G) -> Self {
-        let n: u128 = g.gen();
+    fn arbitrary(g: &mut Gen) -> Self {
+        let n: u128 = Arbitrary::arbitrary(g);
         match n % 6 {
             0 => {
                 let mut b = encode::u8_buffer();