diff --git a/.cargo/README.md b/.cargo/README.md
index b123458..1cfef07 100644
--- a/.cargo/README.md
+++ b/.cargo/README.md
@@ -126,8 +126,9 @@ Implemented hash algorithms:
 ### Options
 
 * `color`: Enables colored output.
+* `unstable`: Enables unstable options.
 
-By default all of them are enabled.
+By default only `color` is enabled.
 
 ## Disclaimer
 
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 172724a..1493691 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [Unreleased]
+
+### Added
+
+- Added `unstable` feature.
+
 ## [0.3.1] - 2023-08-19
 
 ### Fixed
@@ -50,6 +56,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Initial release.
 
+[Unreleased]: https://github.com/ferric-bytes/chksum-cli/compare/v0.3.1...HEAD
 [0.3.1]: https://github.com/ferric-bytes/chksum-cli/compare/v0.3.0...v0.3.1
 [0.3.0]: https://github.com/ferric-bytes/chksum-cli/compare/v0.2.0...v0.3.0
 [0.2.0]: https://github.com/ferric-bytes/chksum-cli/releases/tag/v0.2.0
diff --git a/Cargo.lock b/Cargo.lock
index 0be186c..e70df09 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -165,9 +165,9 @@ checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
 [[package]]
 name = "chksum"
-version = "0.2.1"
+version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3467b3e957eea47de7cf1f9864b9a45309ecd8c6894afec6679514c38be7287e"
+checksum = "00e5d666d3b2f7b68fb54c8a492b4aea757ce147b2815358a5b6c45e6a9f24d6"
 dependencies = [
  "chksum-hash",
  "is-terminal",
@@ -203,9 +203,9 @@ dependencies = [
 
 [[package]]
 name = "chksum-hash"
-version = "0.4.2"
+version = "0.4.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3aedf30f8c768090e239caa6e111806fb06b180c9cbcebabe984f04487d29934"
+checksum = "6883bbf1ecf4736e5af31acd07b133d6595d2c431eda4106c8cf38f444a2208c"
 dependencies = [
  "anyhow",
  "chksum-build",
diff --git a/Cargo.toml b/Cargo.toml
index d6bbe78..655a46e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -20,7 +20,7 @@ rustdoc-args = ["--cfg", "docsrs"]
 
 [dependencies]
 anyhow = "1.0.72"
-chksum = "0.2.1"
+chksum = "0.2.2"
 clap = { version = "4.3.19", features = ["cargo", "derive", "wrap_help", "unicode"] }
 colored = { version = "2.0.4", optional = true }
 exitcode = "1.1.2"
@@ -43,6 +43,7 @@ default = [
 
 # compilation
 color = ["colored"]
+unstable = ["chksum/unstable"]
 
 # algorithms
 md5 = ["chksum/md5"]
diff --git a/README.md b/README.md
index 1b022bb..e88734d 100644
--- a/README.md
+++ b/README.md
@@ -127,8 +127,9 @@ Implemented hash algorithms:
 ### Options
 
 * `color`: Enables colored output.
+* `unstable`: Enables unstable options.
 
-By default all of them are enabled.
+By default only `color` is enabled.
 
 ## Disclaimer