diff --git a/Cargo.toml b/Cargo.toml
index 2dabafe..fd5e443 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "sluice"
-version = "0.4.1"
+version = "0.4.2"
 authors = ["Stephen M. Coakley <me@stephencoakley.com>"]
 edition = "2018"
 description = "Efficient ring buffer for byte buffers, FIFO queues, and SPSC channels"
@@ -21,7 +21,7 @@ futures-io-preview = "0.3.0-alpha.18"
 
 [dev-dependencies]
 criterion = "0.3"
-futures-preview = "0.3.0-alpha.17"
+futures-preview = "0.3.0-alpha.18"
 
 [[bench]]
 name = "pipe"