diff --git a/CHANGELOG.md b/CHANGELOG.md
index bdb6af92..b825fb30 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,4 @@
-### Version 0.18.1 (unreleased)
+### Version 0.18.1
  - Bump `rayon` to 0.9
  - Fix failure to optimize on certain grayscale images ([#89](https://github.com/shssoichiro/oxipng/issues/89))
 
diff --git a/Cargo.lock b/Cargo.lock
index 5aa2eaa5..adf17835 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -335,7 +335,7 @@ dependencies = [
 
 [[package]]
 name = "oxipng"
-version = "0.18.0"
+version = "0.18.1"
 dependencies = [
  "bit-vec 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "byteorder 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
diff --git a/Cargo.toml b/Cargo.toml
index c7ce2489..795c1741 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -14,7 +14,7 @@ homepage = "https://github.com/shssoichiro/oxipng"
 license = "MIT"
 name = "oxipng"
 repository = "https://github.com/shssoichiro/oxipng"
-version = "0.18.0"
+version = "0.18.1"
 
 [[bin]]
 doc = false