diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,10 +1,20 @@
 `submark` changelog
 ===================
 
+Version 0.4.0
+-------------
+
+Released on May 17, 2026.
+
+ -  Added `-v`/`--version` option.
+ -  Added prebuilt binaries for Linux aarch64 and macOS aarch64.
+ -  Added linux/arm64 Docker images.
+
+
 Version 0.3.1
 -------------
 
-Released on Match 15, 2022.
+Released on March 15, 2022.
 
  -  Added `dahlia/submark` action for GitHub Actions.  [[#6]]
  -  Added `dahlia/submark/setup` action for GitHub Actions.  [[#6]]
diff --git a/README.md b/README.md
--- a/README.md
+++ b/README.md
@@ -86,8 +86,8 @@
 Prebuilt binaries for the following platforms and architectures are available on
 [GitHub releases]:
 
- -  Linux (x86_64)
- -  macOS (x86_64)
+ -  Linux (x86_64, aarch64)
+ -  macOS (x86_64, aarch64)
  -  Windows (win64)
 
 For other platforms and architectures, you need to build it by yourself.
diff --git a/app/Main.hs b/app/Main.hs
--- a/app/Main.hs
+++ b/app/Main.hs
@@ -1,15 +1,23 @@
 {-# LANGUAGE DisambiguateRecordFields #-}
+{-# LANGUAGE LambdaCase #-}
 {-# LANGUAGE NamedFieldPuns #-}
 import Data.Maybe
+import Data.Version
 import System.IO
 
 import CMark
-import Data.Text hiding (empty, foldl)
+import Data.Text (pack)
 import Data.Text.IO as TIO
 import Options.Applicative
 
 import Text.CommonMark.Sub
+import qualified Paths_submark as Meta
 
+data Command
+    = Extract Extraction
+    | ShowVersion
+    deriving (Eq, Ord, Show)
+
 data Extraction = Extraction
     { outputFilePath :: FilePath
     , headingPattern :: HeadingPattern
@@ -56,8 +64,8 @@
         | l <- levels
         ]
 
-parser :: Parser Extraction
-parser = Extraction
+extractionParser :: Parser Extraction
+extractionParser = Extraction
     -- CHECK: Write docs in README.md for a new option.
     <$> strOption (  long "out-file"
                   <> short 'o'
@@ -89,7 +97,17 @@
                     <> help "CommonMark/Markdown text to extract from."
                     )
 
-parserInfo :: ParserInfo Extraction
+showVersionParser :: Parser Command
+showVersionParser = flag' ShowVersion
+    ( long "version"
+    <> short 'v'
+    <> help "Show version."
+    )
+
+parser :: Parser Command
+parser = (Extract <$> extractionParser) <|> showVersionParser
+
+parserInfo :: ParserInfo Command
 parserInfo = info parser $
     fullDesc <> progDesc "Extract a part from CommonMark/Markdown docs."
 
@@ -127,4 +145,6 @@
     withOutputFile e (`TIO.hPutStrLn` result)
 
 main :: IO ()
-main = execParser parserInfo >>= extract
+main = execParser parserInfo >>= \ case
+    Extract e -> extract e
+    ShowVersion -> Prelude.putStrLn $ showVersion Meta.version
diff --git a/submark.cabal b/submark.cabal
--- a/submark.cabal
+++ b/submark.cabal
@@ -1,11 +1,11 @@
 cabal-version: 1.12
 
--- This file has been generated from package.yaml by hpack version 0.34.4.
+-- This file has been generated from package.yaml by hpack version 0.37.0.
 --
 -- see: https://github.com/sol/hpack
 
 name:           submark
-version:        0.3.1
+version:        0.4.0
 synopsis:       Extract a part from CommonMark/Markdown docs
 category:       Text
 stability:      alpha
@@ -13,7 +13,7 @@
 bug-reports:    https://github.com/dahlia/submark/issues
 author:         Hong Minhee
 maintainer:     hong.minhee@gmail.com
-copyright:      (c) 2017 Hong Minhee
+copyright:      © 2017–2022 Hong Minhee
 license:        GPL-3
 license-file:   LICENSE
 build-type:     Simple
@@ -37,12 +37,12 @@
       Paths_submark
   hs-source-dirs:
       src
-  ghc-options: -Wall -fwarn-incomplete-uni-patterns
+  ghc-options: -Wall -Wincomplete-uni-patterns
   build-depends:
       base >=4.7 && <5
-    , cmark >=0.5.6 && <0.6.0
+    , cmark >=0.5.6 && <0.7.0
     , regex-tdfa >=1.3.1.2 && <1.4
-    , text ==1.*
+    , text <3
   default-language: Haskell2010
 
 executable submark
@@ -51,18 +51,18 @@
       Paths_submark
   hs-source-dirs:
       app
-  ghc-options: -Wall -fwarn-incomplete-uni-patterns
+  ghc-options: -Wall -Wincomplete-uni-patterns
   build-depends:
       base >=4.7 && <5
-    , cmark >=0.5.6 && <0.6.0
-    , optparse-applicative >=0.13.2.0 && <0.17.0.0
+    , cmark >=0.5.6 && <0.7.0
+    , optparse-applicative >=0.13.2.0 && <0.19.0.0
     , submark
-    , text ==1.*
+    , text <3
+  default-language: Haskell2010
   if flag(static)
     ghc-options: -Wall -fwarn-incomplete-uni-patterns -static -optl-static -optl-pthread -optc-Os -fPIC
   else
-    ghc-options: -Wall -fwarn-incomplete-uni-patterns
-  default-language: Haskell2010
+    ghc-options: -Wall -Wincomplete-uni-patterns
 
 test-suite hlint
   type: exitcode-stdio-1.0
@@ -71,12 +71,11 @@
       Paths_submark
   hs-source-dirs:
       lint
-  ghc-options: -Wall -fwarn-incomplete-uni-patterns
   build-depends:
       base >=4.7 && <5
-    , cmark >=0.5.6 && <0.6.0
+    , cmark >=0.5.6 && <0.7.0
     , hlint >=2.0.9 && <4
-    , text ==1.*
+    , text <3
   default-language: Haskell2010
 
 test-suite spec
@@ -88,12 +87,12 @@
       Paths_submark
   hs-source-dirs:
       test
-  ghc-options: -Wall -fwarn-incomplete-uni-patterns
+  ghc-options: -Wno-x-partial
   build-depends:
       base >=4.7 && <5
-    , cmark >=0.5.6 && <0.6.0
+    , cmark >=0.5.6 && <0.7.0
     , hspec >=2.4.4 && <3.0.0
     , submark
     , template-haskell >=2.5
-    , text ==1.*
+    , text <3
   default-language: Haskell2010