diff --git a/shellify.cabal b/shellify.cabal
--- a/shellify.cabal
+++ b/shellify.cabal
@@ -1,6 +1,6 @@
 cabal-version:      3.0
 name:               shellify
-version:            0.11.0.0
+version:            0.11.0.1
 
 author: Daniel Rolls
 maintainer: daniel.rolls.27@googlemail.com
@@ -27,9 +27,9 @@
 common deps
     default-language: GHC2021
     build-depends:
-        base >=4.16 && <4.19,
+        base >=4.16 && <4.20,
         raw-strings-qq >=1.1 && <1.2,
-        text >=1.2.5.0 && <2.1
+        text >=1.2.5.0 && <2.2
 
     default-extensions:
         LambdaCase
diff --git a/src/Constants.hs b/src/Constants.hs
--- a/src/Constants.hs
+++ b/src/Constants.hs
@@ -25,6 +25,9 @@
     flake.nix created in addition to a shell.nix. Highly recommended to ensure
     the versions of dependencies are kept for reproducibility and so that
     shells are cached to load faster.
+
+    --version
+    Show the version number
 |]
 
 noPackagesError = [r|I can't write out a shell file without any packages specified.
diff --git a/src/Options.hs b/src/Options.hs
--- a/src/Options.hs
+++ b/src/Options.hs
@@ -14,8 +14,10 @@
 import Data.Maybe (fromMaybe)
 import Data.Text (isInfixOf, isPrefixOf, pack, replace, splitOn, stripPrefix, takeWhile, Text(), unpack)
 import Data.Text.IO (hPutStrLn, writeFile)
+import Data.Version (showVersion)
 import qualified Data.Text.IO as Text
 import GHC.IO.Exception (ExitCode(ExitSuccess, ExitFailure))
+import Paths_shellify (version)
 import System.Directory (doesPathExist)
 import System.Exit (exitWith)
 import System.IO (stderr)
@@ -62,6 +64,7 @@
         baseOption :: Text -> [Text] -> OptionsParser
         baseOption "-h" = returnError $ helpText progName
         baseOption "--help" = returnError $ helpText progName
+        baseOption "--version" = returnError $ "Shellify " <> (pack $ showVersion version)
         baseOption "--command" = handleCommandSwitch
         baseOption "--run" = handleCommandSwitch
         baseOption "--with-flake" = transformOptionsWith setFlakeGeneration
diff --git a/test/Spec.hs b/test/Spec.hs
--- a/test/Spec.hs
+++ b/test/Spec.hs
@@ -22,6 +22,9 @@
           `shouldReturnSubstring` "USAGE:"
       shellifyWithArgs "--help"
           `shouldReturnSubstring` "USAGE:"
+    it "should show the version number when requested" $ do
+      shellifyWithArgs "--version"
+          `shouldReturnSubstring` "Shellify 0."
 
     it "should not support -p with shell" $ do
       shellifyWithArgs "shell -p cowsay"