diff --git a/CHANGELOG.md b/CHANGELOG.md
index c5027030..12308c0d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+### Version 4.0.1
+- Includes an update to libdeflater that improves support for targets
+  without a C stdlib, like wasm32.
+
 ### Version 4.0.0
 - [Breaking] Bump minimum Rust version to 1.45.0
 - [Feature] Make `libdeflater` and `zopfli` optional for API users
diff --git a/Cargo.lock b/Cargo.lock
index f4cedb68..62e0a5b6 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -248,9 +248,9 @@ dependencies = [
 
 [[package]]
 name = "image"
-version = "0.23.11"
+version = "0.23.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b4f0a8345b33b082aedec2f4d7d4a926b845cee184cbe78b703413066564431b"
+checksum = "7ce04077ead78e39ae8610ad26216aed811996b043d47beed5090db674f9e9b5"
 dependencies = [
  "bytemuck",
  "byteorder",
@@ -401,7 +401,7 @@ dependencies = [
 
 [[package]]
 name = "oxipng"
-version = "4.0.0"
+version = "4.0.1"
 dependencies = [
  "bit-vec",
  "byteorder",
@@ -532,9 +532,9 @@ checksum = "8ea5119cdb4c55b55d432abb513a0429384878c15dde60cc77b1c99de1a95a6a"
 
 [[package]]
 name = "termcolor"
-version = "1.1.0"
+version = "1.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bb6bfa289a4d7c5766392812c0a1f4c1ba45afa1ad47803c11e1f407d846d75f"
+checksum = "bf11676eb135389f21fcda654382c4859bbfc1d2f36e4425a2f829bb41b1e20e"
 dependencies = [
  "winapi-util",
 ]
diff --git a/Cargo.toml b/Cargo.toml
index 70bd0db9..f38b0779 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -16,7 +16,7 @@ license = "MIT"
 name = "oxipng"
 repository = "https://github.com/shssoichiro/oxipng"
 build = "build.rs"
-version = "4.0.0"
+version = "4.0.1"
 
 [badges]
 travis-ci = { repository = "shssoichiro/oxipng", branch = "master" }