diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,16 @@
 and this project adheres to the
 [Haskell Package Versioning Policy](https://pvp.haskell.org/).
 
+## 0.5.1.0 - 2026-07-02
+
+* Fix a regression on unsupported operating systems.
+
+## 0.5.0.0 - 2026-06-22
+
+* Fix a regression on Linux operating systems, whereby `xdg-open` would not
+  return until the browser was closed.
+* Replace utility `openBrowserWithExitCode` with `openBrowserWithException`.
+
 ## 0.4.0.0 - 2025-04-02
 
 * On Unix-like operating systems, use Haskell to silence the opening
diff --git a/example/Main.hs b/example/Main.hs
--- a/example/Main.hs
+++ b/example/Main.hs
@@ -5,8 +5,7 @@
   ) where
 
 import Control.Exception ( Exception (..), SomeException )
-import System.Exit ( ExitCode (..) )
-import Web.Browser ( openBrowser, openBrowserWithExitCode )
+import Web.Browser ( openBrowser, openBrowserWithException )
 
 main :: IO ()
 main = do
@@ -21,14 +20,11 @@
   putStrLn "Try a bad URL:"
   tryOpenBadUrl >>= reportResult
  where
-  tryOpenGoodUrl :: IO (Either SomeException (ExitCode, String, String))
-  tryOpenGoodUrl = openBrowserWithExitCode "https://haskell.org/"
-  tryOpenBadUrl :: IO (Either SomeException (ExitCode, String, String))
-  tryOpenBadUrl = openBrowserWithExitCode "example-bad-url"
+  tryOpenGoodUrl :: IO (Maybe SomeException)
+  tryOpenGoodUrl = openBrowserWithException "https://haskell.org/"
+  tryOpenBadUrl :: IO (Maybe SomeException)
+  tryOpenBadUrl = openBrowserWithException "example-bad-url"
   reportResult = \case
-    Left e -> putStrLn $ "Exception: " <> displayException e
-    Right (ec, out, err) -> do
-      putStrLn $ "Exit code: " <> show ec
-      putStrLn $ "Standard output: " <> out
-      putStrLn $ "Standard error: " <> err
+    Just e -> putStrLn $ "Exception: " <> displayException e
+    Nothing -> putStrLn "Nothing to report"
   blankLine = putStrLn ""
diff --git a/lib/Web/Browser.hs b/lib/Web/Browser.hs
--- a/lib/Web/Browser.hs
+++ b/lib/Web/Browser.hs
@@ -14,11 +14,11 @@
 module Web.Browser
   ( openBrowser
     -- * Utilities
-  , openBrowserWithExitCode
+  , openBrowserWithException
   ) where
 
 import           Control.Exception ( Exception (..), SomeException, try)
-import           System.Exit ( ExitCode (..) )
+import           Data.Maybe ( isNothing )
 import qualified Web.Browser.OS as OS
 
 -- | Seeks to open the given item, silently. If the item is a URL or another
@@ -47,23 +47,18 @@
      String
      -- ^ URL or other item to try to open.
   -> IO Bool
-openBrowser url = tryOpenUrl >>= \case
-  Left _ -> pure False
-  Right (ec, _, _) -> pure $ ec == ExitSuccess
- where
-  tryOpenUrl :: IO (Either SomeException (ExitCode, String, String))
-  tryOpenUrl = openBrowserWithExitCode url
+openBrowser url =
+  isNothing <$> (openBrowserWithException url :: IO (Maybe SomeException))
 
--- | Exported to help with debugging. As for 'openBrowser' but returns either an
--- exception or, as a triple, the 'ExitCode' of the opening mechanism and any
--- output to the standard output and standard error channels. On failure, the
--- meaning of the exit code will depend on the operating system; for unsupported
--- operating systems, it will be 'ExitFailure' @1@.
+-- | Exported to help with debugging. As for 'openBrowser' but returns 'Nothing'
+-- or 'Just' an exception.
 --
--- @since 0.4.0.0
-openBrowserWithExitCode ::
+-- @since 0.5.0.0
+openBrowserWithException ::
      Exception e
   => String
      -- ^ URL or other item to try to open.
-  -> IO (Either e (ExitCode, String, String))
-openBrowserWithExitCode url = try $ OS.openBrowserWithExitCode url
+  -> IO (Maybe e)
+openBrowserWithException url = try (OS.openBrowser url) >>= \case
+  Left e -> pure $ Just e
+  Right () -> pure Nothing
diff --git a/lib/unix-like/open/Web/Browser/OS.hs b/lib/unix-like/open/Web/Browser/OS.hs
--- a/lib/unix-like/open/Web/Browser/OS.hs
+++ b/lib/unix-like/open/Web/Browser/OS.hs
@@ -4,15 +4,21 @@
 --------------------------------------------------------------------------------
 
 module Web.Browser.OS
-  ( openBrowserWithExitCode
+  ( openBrowser
   ) where
 
-import System.Exit ( ExitCode (..) )
-import System.Process ( readProcessWithExitCode )
+import           Control.Monad ( void )
+import           System.Process
+                   ( CreateProcess (..), StdStream (..), createProcess, proc )
 
 -- https://ss64.com/mac/open.html
-openBrowserWithExitCode ::
+openBrowser ::
      String
      -- ^ URL or other item to try to open.
-  -> IO (ExitCode, String, String)
-openBrowserWithExitCode url = readProcessWithExitCode "open" [url] ""
+  -> IO ()
+openBrowser url = void $ createProcess (proc "open" [url])
+  { std_in = NoStream
+  , std_out = NoStream
+  , std_err = NoStream
+  , close_fds = True
+  }
diff --git a/lib/unix-like/xdg-open/Web/Browser/OS.hs b/lib/unix-like/xdg-open/Web/Browser/OS.hs
--- a/lib/unix-like/xdg-open/Web/Browser/OS.hs
+++ b/lib/unix-like/xdg-open/Web/Browser/OS.hs
@@ -3,15 +3,21 @@
 --------------------------------------------------------------------------------
 
 module Web.Browser.OS
-  ( openBrowserWithExitCode
+  ( openBrowser
   ) where
 
-import System.Exit ( ExitCode (..) )
-import System.Process ( readProcessWithExitCode )
+import           Control.Monad ( void )
+import           System.Process
+                   ( CreateProcess (..), StdStream (..), createProcess, proc )
 
 -- https://ss64.com/bash/xdg-open.html
-openBrowserWithExitCode ::
+openBrowser ::
      String
      -- ^ URL or other item to try to open.
-  -> IO (ExitCode, String, String)
-openBrowserWithExitCode url = readProcessWithExitCode "xdg-open" [url] ""
+  -> IO ()
+openBrowser url = void $ createProcess (proc "xdg-open" [url])
+  { std_in = NoStream
+  , std_out = NoStream
+  , std_err = NoStream
+  , close_fds = True
+  }
diff --git a/lib/unsupported-os/Web/Browser/OS.hs b/lib/unsupported-os/Web/Browser/OS.hs
--- a/lib/unsupported-os/Web/Browser/OS.hs
+++ b/lib/unsupported-os/Web/Browser/OS.hs
@@ -3,15 +3,13 @@
 --------------------------------------------------------------------------------
 
 module Web.Browser.OS
-  ( openBrowserWithExitCode
+  ( openBrowser
   ) where
 
-import System.Exit ( ExitCode (..) )
-
-openBrowserWithExitCode ::
+openBrowser ::
      String
      -- ^ URL or other item to try to open.
-  -> IO (ExitCode, String, String)
-openBrowserWithExitCode =
+  -> IO ()
+openBrowser _ =
   -- Operation never succeeds
-  const (pure (ExitFailure 1, "", "Unsupported operating system."))
+  error "openBrowser: Unsupported operating system."
diff --git a/lib/windows/Web/Browser/OS.hs b/lib/windows/Web/Browser/OS.hs
--- a/lib/windows/Web/Browser/OS.hs
+++ b/lib/windows/Web/Browser/OS.hs
@@ -8,12 +8,14 @@
 --------------------------------------------------------------------------------
 
 module Web.Browser.OS
-  ( openBrowserWithExitCode
+  ( openBrowser
   ) where
 
-import System.Exit ( ExitCode (..) )
-import System.Win32.Types
-         ( HANDLE, HINSTANCE, INT, LPCWSTR, handleToWord, nullPtr, withTString )
+import           Control.Monad ( unless )
+import           System.Win32.Types
+                   ( HANDLE, HINSTANCE, INT, LPCWSTR, handleToWord, nullPtr
+                   , withTString
+                   )
 
 type HWND = HANDLE
 
@@ -25,18 +27,18 @@
 sW_SHOWNORMAL :: INT
 sW_SHOWNORMAL = 1
 
-openBrowserWithExitCode ::
+openBrowser ::
      String
      -- ^ URL or other item to try to open.
-  -> IO (ExitCode, String, String)
-openBrowserWithExitCode url =
-  withTString "open" $ \openStr ->
-    withTString url $ \urlStr -> exitcodeToExitCode <$>
+  -> IO ()
+openBrowser url = do
+  hinst <- withTString "open" $ \openStr ->
+    withTString url $ \urlStr ->
       c_ShellExecute nullPtr openStr urlStr nullPtr nullPtr sW_SHOWNORMAL
- where
-  exitcodeToExitCode hinst =
-    let exitcode = fromIntegral $ handleToWord hinst
-    in  (if exitcode > 32 then ExitSuccess else ExitFailure exitcode, "", "")
+  let exitcode = fromIntegral (handleToWord hinst) :: Int
+  unless (exitcode > 32) $ error $
+       "openBrowser: ShellExecuteW \"open\" failed with exit code: "
+    <> show exitcode
 
 -- https://learn.microsoft.com/en-us/windows/win32/api/shellapi/nf-shellapi-shellexecutew
 foreign import ccall unsafe "windows.h ShellExecuteW"
diff --git a/open-browser.cabal b/open-browser.cabal
--- a/open-browser.cabal
+++ b/open-browser.cabal
@@ -1,82 +1,80 @@
 cabal-version: 1.12
-
--- This file has been generated from package.yaml by hpack version 0.38.0.
---
--- see: https://github.com/sol/hpack
-
-name:           open-browser
-version:        0.4.0.0
-synopsis:       Open a web browser from Haskell
-description:    Open a web browser from Haskell. Windows, macOS, Linux and BSD are supported.
-category:       Web
-homepage:       https://github.com/mpilgrem/open-browser
-bug-reports:    https://github.com/mpilgrem/open-browser/issues
-author:         rightfold
-maintainer:     public@pilgrem.com
-license:        BSD3
-license-file:   LICENSE
-build-type:     Simple
-tested-with:
-    GHC >= 8.4
-extra-source-files:
-    CHANGELOG.md
-    README.md
-    stack.yaml
-    stack.yaml.lock
-
-source-repository head
-  type: git
-  location: https://github.com/mpilgrem/open-browser
-
-flag example
-  description: Build the example application
-  manual: True
-  default: False
-
-library
-  hs-source-dirs:
-      lib
-  exposed-modules:
-      Web.Browser
-  build-depends:
-      base ==4.*
-  default-language: Haskell2010
-  if os(windows)
-    other-modules:
-        Web.Browser.OS
-    hs-source-dirs:
-        lib/windows
-    build-depends:
-        Win32 <3
-  else
-    if os(darwin)
-      other-modules:
-          Web.Browser.OS
-      hs-source-dirs:
-          lib/unix-like/open
-      build-depends:
-          process >=1.2.0.0 && <2
-    else
-      if os(linux) || os(freebsd) || os(openbsd) || os(netbsd)
-        other-modules:
-            Web.Browser.OS
-        hs-source-dirs:
-            lib/unix-like/xdg-open
-        build-depends:
-            process >=1.2.0.0 && <2
-      else
-        other-modules:
-            Web.Browser.OS
-        hs-source-dirs:
-            lib/unsupported-os
-
-executable open-browser-example
-  main-is: Main.hs
-  hs-source-dirs:
-      example
-  build-depends:
-      base ==4.*
-    , open-browser
-  default-language: Haskell2010
-  if !flag(example)
-    buildable: False
+
+-- This file has been generated from package.yaml by hpack version 0.39.6.
+--
+-- see: https://github.com/sol/hpack
+
+name:           open-browser
+version:        0.5.1.0
+synopsis:       Open a web browser from Haskell
+description:    Open a web browser from Haskell. Windows, macOS, Linux and BSD are supported.
+category:       Web
+homepage:       https://github.com/mpilgrem/open-browser
+bug-reports:    https://github.com/mpilgrem/open-browser/issues
+author:         rightfold
+maintainer:     public@pilgrem.com
+license:        BSD3
+license-file:   LICENSE
+build-type:     Simple
+tested-with:
+    GHC >= 8.4
+extra-source-files:
+    CHANGELOG.md
+    README.md
+
+source-repository head
+  type: git
+  location: https://github.com/mpilgrem/open-browser
+
+flag example
+  description: Build the example application
+  manual: True
+  default: False
+
+library
+  hs-source-dirs:
+      lib
+  exposed-modules:
+      Web.Browser
+  build-depends:
+      base ==4.*
+  default-language: Haskell2010
+  if os(windows)
+    other-modules:
+        Web.Browser.OS
+    hs-source-dirs:
+        lib/windows
+    build-depends:
+        Win32 <3
+  else
+    if os(darwin)
+      other-modules:
+          Web.Browser.OS
+      hs-source-dirs:
+          lib/unix-like/open
+      build-depends:
+          process >=1.2.0.0 && <2
+    else
+      if os(linux) || os(freebsd) || os(openbsd) || os(netbsd)
+        other-modules:
+            Web.Browser.OS
+        hs-source-dirs:
+            lib/unix-like/xdg-open
+        build-depends:
+            process >=1.2.0.0 && <2
+      else
+        other-modules:
+            Web.Browser.OS
+        hs-source-dirs:
+            lib/unsupported-os
+
+executable open-browser-example
+  main-is: Main.hs
+  hs-source-dirs:
+      example
+  build-depends:
+      base ==4.*
+    , open-browser
+  default-language: Haskell2010
+  if !flag(example)
+    buildable: False
diff --git a/stack.yaml b/stack.yaml
deleted file mode 100644
--- a/stack.yaml
+++ /dev/null
@@ -1,1 +0,0 @@
-snapshot: lts-23.17 # GHC 9.8.4
diff --git a/stack.yaml.lock b/stack.yaml.lock
deleted file mode 100644
--- a/stack.yaml.lock
+++ /dev/null
@@ -1,12 +0,0 @@
-# This file was autogenerated by Stack.
-# You should not edit this file by hand.
-# For more information, please see the documentation at:
-#   https://docs.haskellstack.org/en/stable/topics/lock_files
-
-packages: []
-snapshots:
-- completed:
-    sha256: 2763632e4c4094ce12f5ae12b22f524cdc6453b6b19007ff164a37fd9d2ea829
-    size: 683819
-    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/23/17.yaml
-  original: lts-23.17