diff --git a/README.md b/README.md
index 1fdf6ca686..2ba0c4829c 100644
--- a/README.md
+++ b/README.md
@@ -17,7 +17,7 @@
 </p>
 
 <p align="center">
-  <a href="https://rust-lang-nursery.github.io/futures-api-docs/0.3.0-alpha.3/futures/">
+  <a href="https://rust-lang-nursery.github.io/futures-api-docs/0.3.0-alpha.4/futures/">
     Documentation
   </a> | <a href="https://rust-lang-nursery.github.io/futures-rs/">
     Website
@@ -30,7 +30,7 @@ Add this to your `Cargo.toml`:
 
 ```toml
 [dependencies]
-futures-preview = "0.3.0-alpha.3"
+futures-preview = "0.3.0-alpha.4"
 ```
 
 Now, you can use futures-rs:
@@ -47,7 +47,7 @@ a `#[no_std]` environment, use:
 
 ```toml
 [dependencies]
-futures-preview = { version = "0.3.0-alpha.3", default-features = false }
+futures-preview = { version = "0.3.0-alpha.4", default-features = false }
 ```
 
 # License
diff --git a/futures-channel/Cargo.toml b/futures-channel/Cargo.toml
index d1643c5e58..4f01ddf02b 100644
--- a/futures-channel/Cargo.toml
+++ b/futures-channel/Cargo.toml
@@ -3,12 +3,12 @@ cargo-features = ["edition"]
 [package]
 name = "futures-channel-preview"
 edition = "2018"
-version = "0.3.0-alpha.3"
+version = "0.3.0-alpha.4"
 authors = ["Alex Crichton <alex@alexcrichton.com>"]
 license = "MIT OR Apache-2.0"
 repository = "https://github.com/rust-lang-nursery/futures-rs"
 homepage = "https://rust-lang-nursery.github.io/futures-rs"
-documentation = "https://rust-lang-nursery.github.io/futures-api-docs/0.3.0-alpha.3/futures_channel"
+documentation = "https://rust-lang-nursery.github.io/futures-api-docs/0.3.0-alpha.4/futures_channel"
 description = """
 Channels for asynchronous communication using futures-rs.
 """
@@ -21,8 +21,8 @@ std = ["futures-core-preview/std"]
 default = ["std"]
 
 [dependencies]
-futures-core-preview = { path = "../futures-core", version = "0.3.0-alpha.3", default-features = false }
+futures-core-preview = { path = "../futures-core", version = "0.3.0-alpha.4", default-features = false }
 
 [dev-dependencies]
-futures-preview = { path = "../futures", version = "0.3.0-alpha.3", default-features = true }
+futures-preview = { path = "../futures", version = "0.3.0-alpha.4", default-features = true }
 pin-utils = "0.1.0-alpha.2"
diff --git a/futures-channel/src/lib.rs b/futures-channel/src/lib.rs
index 7c3cdd7f60..4c5a6d86a8 100644
--- a/futures-channel/src/lib.rs
+++ b/futures-channel/src/lib.rs
@@ -10,7 +10,7 @@
 #![warn(missing_docs, missing_debug_implementations)]
 #![deny(bare_trait_objects)]
 
-#![doc(html_root_url = "https://rust-lang-nursery.github.io/futures-api-docs/0.3.0-alpha.3/futures_channel")]
+#![doc(html_root_url = "https://rust-lang-nursery.github.io/futures-api-docs/0.3.0-alpha.4/futures_channel")]
 
 macro_rules! if_std {
     ($($i:item)*) => ($(
diff --git a/futures-core/Cargo.toml b/futures-core/Cargo.toml
index 5bd936d7d5..38a88ed596 100644
--- a/futures-core/Cargo.toml
+++ b/futures-core/Cargo.toml
@@ -3,12 +3,12 @@ cargo-features = ["edition"]
 [package]
 name = "futures-core-preview"
 edition = "2018"
-version = "0.3.0-alpha.3"
+version = "0.3.0-alpha.4"
 authors = ["Alex Crichton <alex@alexcrichton.com>"]
 license = "MIT OR Apache-2.0"
 repository = "https://github.com/rust-lang-nursery/futures-rs"
 homepage = "https://rust-lang-nursery.github.io/futures-rs"
-documentation = "https://rust-lang-nursery.github.io/futures-api-docs/0.3.0-alpha.3/futures_core"
+documentation = "https://rust-lang-nursery.github.io/futures-api-docs/0.3.0-alpha.4/futures_core"
 description = """
 The core traits and types in for the `futures` library.
 """
diff --git a/futures-core/src/lib.rs b/futures-core/src/lib.rs
index 686f9e7083..11b89594fe 100644
--- a/futures-core/src/lib.rs
+++ b/futures-core/src/lib.rs
@@ -7,7 +7,7 @@
 #![warn(missing_docs, missing_debug_implementations)]
 #![deny(bare_trait_objects)]
 
-#![doc(html_root_url = "https://rust-lang-nursery.github.io/futures-api-docs/0.3.0-alpha.3/futures_core")]
+#![doc(html_root_url = "https://rust-lang-nursery.github.io/futures-api-docs/0.3.0-alpha.4/futures_core")]
 
 #[doc(hidden)] pub use crate::future::Future;
 #[doc(hidden)] pub use crate::future::TryFuture;
diff --git a/futures-executor/Cargo.toml b/futures-executor/Cargo.toml
index 14e6d1dc61..1b68a340d1 100644
--- a/futures-executor/Cargo.toml
+++ b/futures-executor/Cargo.toml
@@ -3,12 +3,12 @@ cargo-features = ["edition"]
 [package]
 name = "futures-executor-preview"
 edition = "2018"
-version = "0.3.0-alpha.3"
+version = "0.3.0-alpha.4"
 authors = ["Alex Crichton <alex@alexcrichton.com>"]
 license = "MIT OR Apache-2.0"
 repository = "https://github.com/rust-lang-nursery/futures-rs"
 homepage = "https://rust-lang-nursery.github.io/futures-rs"
-documentation = "https://rust-lang-nursery.github.io/futures-api-docs/0.3.0-alpha.3/futures_executor"
+documentation = "https://rust-lang-nursery.github.io/futures-api-docs/0.3.0-alpha.4/futures_executor"
 description = """
 Executors for asynchronous tasks based on the futures-rs library.
 """
@@ -21,13 +21,13 @@ std = ["num_cpus", "futures-core-preview/std", "futures-util-preview/std", "futu
 default = ["std"]
 
 [dependencies]
-futures-core-preview = { path = "../futures-core", version = "0.3.0-alpha.3", default-features = false}
-futures-util-preview = { path = "../futures-util", version = "0.3.0-alpha.3", default-features = false}
-futures-channel-preview = { path = "../futures-channel", version = "0.3.0-alpha.3", default-features = false}
+futures-core-preview = { path = "../futures-core", version = "0.3.0-alpha.4", default-features = false}
+futures-util-preview = { path = "../futures-util", version = "0.3.0-alpha.4", default-features = false}
+futures-channel-preview = { path = "../futures-channel", version = "0.3.0-alpha.4", default-features = false}
 num_cpus = { version = "1.8.0", optional = true }
 lazy_static = { version = "1.1.0", optional = true }
 pin-utils = "0.1.0-alpha.2"
 
 [dev-dependencies]
-futures-preview = { path = "../futures", version = "0.3.0-alpha.3" }
-futures-channel-preview = { path = "../futures-channel", version = "0.3.0-alpha.3" }
+futures-preview = { path = "../futures", version = "0.3.0-alpha.4" }
+futures-channel-preview = { path = "../futures-channel", version = "0.3.0-alpha.4" }
diff --git a/futures-executor/src/lib.rs b/futures-executor/src/lib.rs
index 77acfc8b04..cad77f854d 100644
--- a/futures-executor/src/lib.rs
+++ b/futures-executor/src/lib.rs
@@ -7,7 +7,7 @@
 #![warn(missing_docs, missing_debug_implementations)]
 #![deny(bare_trait_objects)]
 
-#![doc(html_root_url = "https://rust-lang-nursery.github.io/futures-api-docs/0.3.0-alpha.3/futures_executor")]
+#![doc(html_root_url = "https://rust-lang-nursery.github.io/futures-api-docs/0.3.0-alpha.4/futures_executor")]
 
 macro_rules! if_std {
     ($($i:item)*) => ($(
diff --git a/futures-io/Cargo.toml b/futures-io/Cargo.toml
index 01c006fe12..7b5d6e24b4 100644
--- a/futures-io/Cargo.toml
+++ b/futures-io/Cargo.toml
@@ -3,12 +3,12 @@ cargo-features = ["edition"]
 [package]
 name = "futures-io-preview"
 edition = "2018"
-version = "0.3.0-alpha.3"
+version = "0.3.0-alpha.4"
 authors = ["Alex Crichton <alex@alexcrichton.com>"]
 license = "MIT OR Apache-2.0"
 repository = "https://github.com/rust-lang-nursery/futures-rs"
 homepage = "https://rust-lang-nursery.github.io/futures-rs"
-documentation = "https://rust-lang-nursery.github.io/futures-api-docs/0.3.0-alpha.3/futures_io"
+documentation = "https://rust-lang-nursery.github.io/futures-api-docs/0.3.0-alpha.4/futures_io"
 description = """
 The `AsyncRead` and `AsyncWrite` traits for the futures-rs library.
 """
@@ -21,9 +21,9 @@ std = ["futures-core-preview/std", "iovec"]
 default = ["std"]
 
 [dependencies]
-futures-core-preview = { path = "../futures-core", version = "0.3.0-alpha.3", default-features = false }
+futures-core-preview = { path = "../futures-core", version = "0.3.0-alpha.4", default-features = false }
 iovec = { version = "0.1", optional = true }
 
 [dev-dependencies]
-futures-preview = { path = "../futures", version = "0.3.0-alpha.3" }
+futures-preview = { path = "../futures", version = "0.3.0-alpha.4" }
 assert_matches = "1.3.0"
diff --git a/futures-io/src/lib.rs b/futures-io/src/lib.rs
index 9a7b6e53aa..e5766e0aca 100644
--- a/futures-io/src/lib.rs
+++ b/futures-io/src/lib.rs
@@ -9,7 +9,7 @@
 #![warn(missing_docs, missing_debug_implementations)]
 #![deny(bare_trait_objects)]
 
-#![doc(html_root_url = "https://rust-lang-nursery.github.io/futures-api-docs/0.3.0-alpha.3/futures_io")]
+#![doc(html_root_url = "https://rust-lang-nursery.github.io/futures-api-docs/0.3.0-alpha.4/futures_io")]
 
 #![feature(futures_api)]
 
diff --git a/futures-sink/Cargo.toml b/futures-sink/Cargo.toml
index fc59de4dd4..fac9afde79 100644
--- a/futures-sink/Cargo.toml
+++ b/futures-sink/Cargo.toml
@@ -3,12 +3,12 @@ cargo-features = ["edition"]
 [package]
 name = "futures-sink-preview"
 edition = "2018"
-version = "0.3.0-alpha.3"
+version = "0.3.0-alpha.4"
 authors = ["Alex Crichton <alex@alexcrichton.com>"]
 license = "MIT OR Apache-2.0"
 repository = "https://github.com/rust-lang-nursery/futures-rs"
 homepage = "https://rust-lang-nursery.github.io/futures-rs"
-documentation = "https://rust-lang-nursery.github.io/futures-api-docs/0.3.0-alpha.3/futures_sink"
+documentation = "https://rust-lang-nursery.github.io/futures-api-docs/0.3.0-alpha.4/futures_sink"
 description = """
 The asynchronous `Sink` trait for the futures-rs library.
 """
@@ -22,5 +22,5 @@ default = ["std"]
 
 [dependencies]
 either = { version = "1.4", default-features = false, optional = true }
-futures-core-preview = { path = "../futures-core", version = "0.3.0-alpha.3", default-features = false }
-futures-channel-preview = { path = "../futures-channel", version = "0.3.0-alpha.3", default-features = false }
+futures-core-preview = { path = "../futures-core", version = "0.3.0-alpha.4", default-features = false }
+futures-channel-preview = { path = "../futures-channel", version = "0.3.0-alpha.4", default-features = false }
diff --git a/futures-sink/src/lib.rs b/futures-sink/src/lib.rs
index 0c66ac59bc..89ea6bc258 100644
--- a/futures-sink/src/lib.rs
+++ b/futures-sink/src/lib.rs
@@ -5,7 +5,7 @@
 
 #![no_std]
 #![warn(missing_docs, missing_debug_implementations)]
-#![doc(html_root_url = "https://rust-lang-nursery.github.io/futures-api-docs/0.3.0-alpha.3/futures_sink")]
+#![doc(html_root_url = "https://rust-lang-nursery.github.io/futures-api-docs/0.3.0-alpha.4/futures_sink")]
 
 #![feature(pin, arbitrary_self_types, futures_api)]
 
diff --git a/futures-test/Cargo.toml b/futures-test/Cargo.toml
index 785097295d..9e6c054607 100644
--- a/futures-test/Cargo.toml
+++ b/futures-test/Cargo.toml
@@ -3,12 +3,12 @@ cargo-features = ["edition"]
 [package]
 name = "futures-test-preview"
 edition = "2018"
-version = "0.3.0-alpha.3"
+version = "0.3.0-alpha.4"
 authors = ["Wim Looman <wim@nemo157.com>"]
 license = "MIT OR Apache-2.0"
 repository = "https://github.com/rust-lang-nursery/futures-rs"
 homepage = "https://rust-lang-nursery.github.io/futures-rs"
-documentation = "https://rust-lang-nursery.github.io/futures-doc/0.3.0-alpha.3/futures_test"
+documentation = "https://rust-lang-nursery.github.io/futures-doc/0.3.0-alpha.4/futures_test"
 description = """
 Common utilities for testing components built off futures-rs.
 """
diff --git a/futures-test/src/lib.rs b/futures-test/src/lib.rs
index fc38aac255..956fd20750 100644
--- a/futures-test/src/lib.rs
+++ b/futures-test/src/lib.rs
@@ -10,7 +10,7 @@
 #![warn(missing_docs, missing_debug_implementations)]
 #![deny(bare_trait_objects)]
 #![doc(
-    html_root_url = "https://rust-lang-nursery.github.io/futures-doc/0.3.0-alpha.3/futures_test"
+    html_root_url = "https://rust-lang-nursery.github.io/futures-doc/0.3.0-alpha.4/futures_test"
 )]
 
 #[doc(hidden)]
diff --git a/futures-util/Cargo.toml b/futures-util/Cargo.toml
index f762c6efbc..de2b9bc92c 100644
--- a/futures-util/Cargo.toml
+++ b/futures-util/Cargo.toml
@@ -3,12 +3,12 @@ cargo-features = ["edition", "rename-dependency"]
 [package]
 name = "futures-util-preview"
 edition = "2018"
-version = "0.3.0-alpha.3"
+version = "0.3.0-alpha.4"
 authors = ["Alex Crichton <alex@alexcrichton.com>"]
 license = "MIT OR Apache-2.0"
 repository = "https://github.com/rust-lang-nursery/futures-rs"
 homepage = "https://rust-lang-nursery.github.io/futures-rs"
-documentation = "https://rust-lang-nursery.github.io/futures-api-docs/0.3.0-alpha.3/futures_util"
+documentation = "https://rust-lang-nursery.github.io/futures-api-docs/0.3.0-alpha.4/futures_util"
 description = """
 Common utilities and extension traits for the futures-rs library.
 """
@@ -25,10 +25,10 @@ bench = []
 nightly = []
 
 [dependencies]
-futures-core-preview = { path = "../futures-core", version = "0.3.0-alpha.3", default-features = false }
-futures-channel-preview = { path = "../futures-channel", version = "0.3.0-alpha.3", default-features = false }
-futures-io-preview = { path = "../futures-io", version = "0.3.0-alpha.3", default-features = false }
-futures-sink-preview = { path = "../futures-sink", version = "0.3.0-alpha.3", default-features = false}
+futures-core-preview = { path = "../futures-core", version = "0.3.0-alpha.4", default-features = false }
+futures-channel-preview = { path = "../futures-channel", version = "0.3.0-alpha.4", default-features = false }
+futures-io-preview = { path = "../futures-io", version = "0.3.0-alpha.4", default-features = false }
+futures-sink-preview = { path = "../futures-sink", version = "0.3.0-alpha.4", default-features = false}
 either = { version = "1.4", default-features = false }
 slab = { version = "0.4", optional = true }
 futures01 = { package = "futures", version = "0.1", optional = true }
@@ -36,7 +36,7 @@ tokio-executor = { version = "0.1.2", optional = true }
 pin-utils = "0.1.0-alpha.2"
 
 [dev-dependencies]
-futures-preview = { path = "../futures", version = "0.3.0-alpha.3", features = ["tokio-compat"] }
-futures-executor-preview = { path = "../futures-executor", version = "0.3.0-alpha.3" }
+futures-preview = { path = "../futures", version = "0.3.0-alpha.4", features = ["tokio-compat"] }
+futures-executor-preview = { path = "../futures-executor", version = "0.3.0-alpha.4" }
 tokio = "0.1.8"
 tokio-threadpool = "0.1.6"
diff --git a/futures-util/src/lib.rs b/futures-util/src/lib.rs
index 81116c1888..ced34c51f0 100644
--- a/futures-util/src/lib.rs
+++ b/futures-util/src/lib.rs
@@ -10,7 +10,7 @@
 #![deny(bare_trait_objects)]
 #![allow(unknown_lints)]
 
-#![doc(html_root_url = "https://rust-lang-nursery.github.io/futures-api-docs/0.3.0-alpha.3/futures_util")]
+#![doc(html_root_url = "https://rust-lang-nursery.github.io/futures-api-docs/0.3.0-alpha.4/futures_util")]
 
 macro_rules! if_std {
     ($($i:item)*) => ($(
diff --git a/futures/Cargo.toml b/futures/Cargo.toml
index 5b6e595032..2bd36b7563 100644
--- a/futures/Cargo.toml
+++ b/futures/Cargo.toml
@@ -3,14 +3,14 @@ cargo-features = ["edition"]
 [package]
 name = "futures-preview"
 edition = "2018"
-version = "0.3.0-alpha.3"
+version = "0.3.0-alpha.4"
 authors = ["Alex Crichton <alex@alexcrichton.com>"]
 license = "MIT OR Apache-2.0"
 readme = "../README.md"
 keywords = ["futures", "async", "future"]
 repository = "https://github.com/rust-lang-nursery/futures-rs"
 homepage = "https://rust-lang-nursery.github.io/futures-rs"
-documentation = "https://rust-lang-nursery.github.io/futures-api-docs/0.3.0-alpha.3/futures"
+documentation = "https://rust-lang-nursery.github.io/futures-api-docs/0.3.0-alpha.4/futures"
 description = """
 An implementation of futures and streams featuring zero allocations,
 composability, and iterator-like interfaces.
@@ -25,16 +25,16 @@ travis-ci = { repository = "rust-lang-nursery/futures-rs" }
 appveyor = { repository = "rust-lang-nursery/futures-rs" }
 
 [dependencies]
-futures-core-preview = { path = "../futures-core", version = "0.3.0-alpha.3", default-features = false }
-futures-channel-preview = { path = "../futures-channel", version = "0.3.0-alpha.3", default-features = false }
-futures-executor-preview = { path = "../futures-executor", version = "0.3.0-alpha.3", default-features = false }
-futures-io-preview = { path = "../futures-io", version = "0.3.0-alpha.3", default-features = false }
-futures-sink-preview = { path = "../futures-sink", version = "0.3.0-alpha.3", default-features = false }
-futures-util-preview = { path = "../futures-util", version = "0.3.0-alpha.3", default-features = false }
+futures-core-preview = { path = "../futures-core", version = "0.3.0-alpha.4", default-features = false }
+futures-channel-preview = { path = "../futures-channel", version = "0.3.0-alpha.4", default-features = false }
+futures-executor-preview = { path = "../futures-executor", version = "0.3.0-alpha.4", default-features = false }
+futures-io-preview = { path = "../futures-io", version = "0.3.0-alpha.4", default-features = false }
+futures-sink-preview = { path = "../futures-sink", version = "0.3.0-alpha.4", default-features = false }
+futures-util-preview = { path = "../futures-util", version = "0.3.0-alpha.4", default-features = false }
 
 [dev-dependencies]
 pin-utils = "0.1.0-alpha.2"
-futures-test-preview = { path = "../futures-test", version = "0.3.0-alpha.3", default-features = false }
+futures-test-preview = { path = "../futures-test", version = "0.3.0-alpha.4", default-features = false }
 
 [features]
 nightly = ["futures-util-preview/nightly"]
diff --git a/futures/src/lib.rs b/futures/src/lib.rs
index d42fe3cc44..b233ebc9bc 100644
--- a/futures/src/lib.rs
+++ b/futures/src/lib.rs
@@ -28,7 +28,7 @@
 #![warn(missing_docs, missing_debug_implementations)]
 #![deny(bare_trait_objects)]
 
-#![doc(html_root_url = "https://rust-lang-nursery.github.io/futures-api-docs/0.3.0-alpha.3/futures")]
+#![doc(html_root_url = "https://rust-lang-nursery.github.io/futures-api-docs/0.3.0-alpha.4/futures")]
 
 #![cfg_attr(feature = "nightly", feature(cfg_target_has_atomic))]