diff --git a/Cargo.toml b/Cargo.toml
index aa1c249..50f49ac 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -34,7 +34,7 @@ log = "0.4"
 time = "0.3"
 derivative = "2"
 smallvec = "1"
-countme = "2"
+countme = "3.0.1"
 
 #serialization
 serde = { version = "1", features = ["derive"] }
@@ -46,11 +46,11 @@ utf-8 = "0.7"
 env_logger = "0.9"
 tokio-test = "0.4"
 tokio = { version = "1", features = ["rt", "macros", "io-util"] }
-tokio-util = { version = "0.6", features = ["compat"] }
-proptest = "0.10"
+tokio-util = { version = "0.7.2", features = ["compat"] }
+proptest = "1.0.0"
 flate2 = "1.0"
-serial_test = "0.5"
-countme = { version = "2", features = ["enable"] }
+serial_test = "0.6"
+countme = { version = "3.0.1", features = ["enable"] }
 
 [profile.release]
 debug=true
diff --git a/src/segmented_buffer.rs b/src/segmented_buffer.rs
index 12fcbf3..7510f6b 100644
--- a/src/segmented_buffer.rs
+++ b/src/segmented_buffer.rs
@@ -100,7 +100,7 @@ impl Buf for Buffer {
 
 // TODO: expose size when const generics become available
 #[derive(PartialEq)]
-pub struct SegmentedBuf<T> {
+pub struct SegmentedBuf<T: 'static> {
     _c: countme::Count<Self>,
     pub(crate) bufs: SmallVec<[T; 4]>,
     pos: usize,
@@ -318,7 +318,7 @@ impl futures::io::AsyncBufRead for SegmentedBuf<Reusable<Buffer>> {
 }
 
 #[pin_project]
-pub struct SegmentedPoolBuf<Fut, T, Fi>
+pub struct SegmentedPoolBuf<Fut, T: 'static, Fi>
 where
     T: ClearBuf,
 {
@@ -713,7 +713,7 @@ impl futures::io::AsyncBufRead for SegmentedBufBytesReader<'_> {
     }
 }
 
-pub struct SegmentedPoolBufIter<'a, F, T, Fi>
+pub struct SegmentedPoolBufIter<'a, F, T: 'static, Fi>
 where
     T: std::marker::Send + ClearBuf,
 {