diff --git a/Cargo.toml b/Cargo.toml
index 3123045..c5c43e2 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "itoa"
-version = "0.3.4" # remember to update html_root_url
+version = "0.4.0" # remember to update html_root_url
 authors = ["David Tolnay <dtolnay@gmail.com>"]
 license = "MIT/Apache-2.0"
 description = "Fast functions for printing integer primitives to an io::Write"
diff --git a/README.md b/README.md
index e7b5b57..759be9d 100644
--- a/README.md
+++ b/README.md
@@ -63,7 +63,7 @@ following in `Cargo.toml`:
 
 ```toml
 [dependencies]
-itoa = "0.3"
+itoa = "0.4"
 ```
 
 ## License
diff --git a/src/lib.rs b/src/lib.rs
index af8cff9..0deabb4 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -6,7 +6,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![doc(html_root_url = "https://docs.rs/itoa/0.3.4")]
+#![doc(html_root_url = "https://docs.rs/itoa/0.4.0")]
 
 #![cfg_attr(not(feature = "std"), no_std)]