diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,21 +1,31 @@
 Changes
 =======
 
+Version 1.4.3
+---------------
+
+_2022-12-18_
+
+* Drop `unbounded-delays` dependency on 64-bit machines (#344).
+* Drop `clock` dependency, decomission `clock` flag (#345).
+* Drop `wcwidth` dependency (#346)
+* Tested with GHC 8.0 - 9.4.
+
 Version 1.4.2.3
 ---------------
 
 _2022-05-10_
 
-- Drop `mtl` dependency
-- Warning-free under GHC 8.0 - 9.2
+* Drop `mtl` dependency
+* Warning-free under GHC 8.0 - 9.2
 
 Version 1.4.2.2
 ---------------
 
 _2022-05-10_
 
-- Fix compilation with `mtl-2.3`
-- Tested with GHC 8.0 - 9.2; dropped support for GHC 7.x
+* Fix compilation with `mtl-2.3`
+* Tested with GHC 8.0 - 9.2; dropped support for GHC 7.x
 
 Version 1.4.2.1
 ---------------
diff --git a/README.md b/README.md
--- a/README.md
+++ b/README.md
@@ -112,8 +112,8 @@
   (based on [LeanCheck](https://hackage.haskell.org/package/leancheck))
 * [tasty-program](https://hackage.haskell.org/package/tasty-program) — run
   external program and test whether it terminates successfully
-* [tasty-wai](https://hackage.haskell.org/package/tasty-wai) — 
-  for testing [wai](https://hackage.haskell.org/wai) endpoints.
+* [tasty-wai](https://hackage.haskell.org/package/tasty-wai) —
+  for testing [wai](https://hackage.haskell.org/package/wai) endpoints.
 * [tasty-inspection-testing](https://hackage.haskell.org/package/tasty-inspection-testing) —
   for compile-time testing of code properties
   (based on [inspection-testing](http://hackage.haskell.org/package/inspection-testing)).
@@ -798,11 +798,11 @@
     See [issue #152](https://github.com/UnkindPartition/tasty/issues/152).
 
 3. **Q**: Patterns with slashes do not work on Windows. How can I fix it?
-  
-   **A**: If you are running Git for Windows terminal, it has a habit of converting slashes 
-   to backslashes. Set `MSYS_NO_PATHCONV=1` to prevent this behaviour, or follow other 
+
+   **A**: If you are running Git for Windows terminal, it has a habit of converting slashes
+   to backslashes. Set `MSYS_NO_PATHCONV=1` to prevent this behaviour, or follow other
    suggestions from [Known Issues](https://github.com/git-for-windows/build-extra/blob/main/ReleaseNotes.md#known-issues).
-   
+
 ## Press
 
 Blog posts and other publications related to tasty. If you wrote or just found
@@ -816,7 +816,7 @@
 * [Custom options in Tasty][custom-options-article]
 * [Resources in Tasty (update)](https://ro-che.info/articles/2013-12-29-tasty-resources-2)
 * [Announcing tasty-rerun](https://ocharles.org.uk/blog/posts/2014-01-20-announcing-tasty-rerun.html)
-* [Code testing in Haskell revisited (with Tasty)](http://ics.p.lodz.pl/~stolarek/blog/2014/01/code-testing-in-haskell-revisited-with-tasty/)
+* [Code testing in Haskell revisited (with Tasty)](https://jstolarek.github.io/posts/2014-01-26-code-testing-in-haskell-revisited-with-tasty.html)
 * [New patterns in tasty][awk-patterns-article]
 * [Screencast: Dynamic Test Suites in Haskell using Hspec and Tasty](https://www.youtube.com/watch?v=PGsDvgmZF7A)
 * [Automatically generated directories for tasty tests][tasty-directories]
diff --git a/Test/Tasty.hs b/Test/Tasty.hs
--- a/Test/Tasty.hs
+++ b/Test/Tasty.hs
@@ -76,7 +76,7 @@
 
 -- | Parse the command line arguments and run the tests.
 --
--- When the tests finish, this function calls 'exitWith' with the exit code
+-- When the tests finish, this function calls 'System.Exit.exitWith' with the exit code
 -- that indicates whether any tests have failed. Most external systems
 -- (stack, cabal, travis-ci, jenkins etc.) rely on the exit code to detect
 -- whether the tests pass. If you want to do something else after
diff --git a/Test/Tasty/CmdLine.hs b/Test/Tasty/CmdLine.hs
--- a/Test/Tasty/CmdLine.hs
+++ b/Test/Tasty/CmdLine.hs
@@ -141,13 +141,13 @@
 
 -- | Parse the command-line and environment options passed to tasty.
 --
--- Useful if you need to get the options before 'defaultMain' is called.
+-- Useful if you need to get the options before 'Test.Tasty.defaultMain' is called.
 --
--- Once within the test tree, 'askOption' should be used instead.
+-- Once within the test tree, 'Test.Tasty.askOption' should be used instead.
 --
 -- The arguments to this function should be the same as for
 -- 'defaultMainWithIngredients'. If you don't use any custom ingredients,
--- pass 'defaultIngredients'.
+-- pass 'Test.Tasty.defaultIngredients'.
 parseOptions :: [Ingredient] -> TestTree -> IO OptionSet
 parseOptions ins tree = do
   let (warnings, parser) = suiteOptionParser ins tree
@@ -163,8 +163,8 @@
 -- | Parse the command line arguments and run the tests using the provided
 -- ingredient list.
 --
--- When the tests finish, this function calls 'exitWith' with the exit code
--- that indicates whether any tests have failed. See 'defaultMain' for
+-- When the tests finish, this function calls 'System.Exit.exitWith' with the exit code
+-- that indicates whether any tests have failed. See 'Test.Tasty.defaultMain' for
 -- details.
 defaultMainWithIngredients :: [Ingredient] -> TestTree -> IO ()
 defaultMainWithIngredients ins testTree = do
diff --git a/Test/Tasty/Core.hs b/Test/Tasty/Core.hs
--- a/Test/Tasty/Core.hs
+++ b/Test/Tasty/Core.hs
@@ -238,7 +238,7 @@
 --
 -- @
 -- 'after_' 'AllFinish' ('Test.Tasty.Patterns.Types.EQ' ('Field' 'NF') ('StringLit' \"Bar\")) $
---    'testCase' \"A test that depends on Foo.Bar\" $ ...
+--    @testCase@ \"A test that depends on Foo.Bar\" $ ...
 -- @
 --
 -- @since 1.2
@@ -269,12 +269,12 @@
 --
 -- @
 -- 'after' 'AllFinish' \"Foo\" $
---    'testCase' \"A test that depends on Foo.Bar\" $ ...
+--    @testCase@ \"A test that depends on Foo.Bar\" $ ...
 -- @
 --
 -- Note, however, that our test also happens to contain @Foo@ as part of its name,
 -- so it also matches the pattern and becomes a dependency of itself. This
--- will result in a 'DependencyLoop' exception. To avoid this, either
+-- will result in a 'Test.Tasty.DependencyLoop' exception. To avoid this, either
 -- change the test name so that it doesn't mention @Foo@ or make the
 -- pattern more specific.
 --
@@ -282,14 +282,14 @@
 --
 -- @
 -- 'after' 'AllFinish' \"$0 == \\\"Tests.Foo.Bar\\\"\" $
---    'testCase' \"A test that depends on Foo.Bar\" $ ...
+--    @testCase@ \"A test that depends on Foo.Bar\" $ ...
 -- @
 --
 -- Or only specify the dependency's own name, ignoring the group names:
 --
 -- @
 -- 'after' 'AllFinish' \"$NF == \\\"Bar\\\"\" $
---    'testCase' \"A test that depends on Foo.Bar\" $ ...
+--    @testCase@ \"A test that depends on Foo.Bar\" $ ...
 -- @
 --
 -- @since 1.2
diff --git a/Test/Tasty/Ingredients.hs b/Test/Tasty/Ingredients.hs
--- a/Test/Tasty/Ingredients.hs
+++ b/Test/Tasty/Ingredients.hs
@@ -110,7 +110,7 @@
   Option (Proxy :: Proxy NumThreads) : opts
 ingredientOptions (TestManager opts _) = opts
 
--- | Like 'ingredientOption', but folds over multiple ingredients.
+-- | Like 'ingredientOptions', but folds over multiple ingredients.
 ingredientsOptions :: [Ingredient] -> [OptionDescription]
 ingredientsOptions = uniqueOptionDescriptions . F.foldMap ingredientOptions
 
diff --git a/Test/Tasty/Ingredients/Basic.hs b/Test/Tasty/Ingredients/Basic.hs
--- a/Test/Tasty/Ingredients/Basic.hs
+++ b/Test/Tasty/Ingredients/Basic.hs
@@ -1,7 +1,7 @@
--- | This module exports the basic ingredients defined in the 'tasty'
+-- | This module exports the basic ingredients defined in the @tasty@
 -- packages.
 --
--- Note that if @defaultIngredients@ from "Test.Tasty" suits your needs,
+-- Note that if 'Test.Tasty.defaultIngredients' from "Test.Tasty" suits your needs,
 -- use that instead of importing this module.
 module Test.Tasty.Ingredients.Basic
   (
diff --git a/Test/Tasty/Ingredients/ConsoleReporter.hs b/Test/Tasty/Ingredients/ConsoleReporter.hs
--- a/Test/Tasty/Ingredients/ConsoleReporter.hs
+++ b/Test/Tasty/Ingredients/ConsoleReporter.hs
@@ -1,5 +1,5 @@
 -- vim:fdm=marker
-{-# LANGUAGE BangPatterns, ImplicitParams, MultiParamTypeClasses, DeriveDataTypeable, FlexibleContexts #-}
+{-# LANGUAGE BangPatterns, ImplicitParams, MultiParamTypeClasses, DeriveDataTypeable, FlexibleContexts, CApiFFI #-}
 -- | Console reporter ingredient
 module Test.Tasty.Ingredients.ConsoleReporter
   ( consoleTestReporter
@@ -48,8 +48,8 @@
 import Text.Printf
 import qualified Data.IntMap as IntMap
 import Data.Char
-#ifdef VERSION_wcwidth
-import Data.Char.WCWidth (wcwidth)
+#ifdef USE_WCWIDTH
+import Foreign.C.Types (CInt(..), CWchar(..))
 #endif
 import Data.List (isInfixOf)
 import Data.Maybe
@@ -83,7 +83,7 @@
       -- ^ Name of a test group, an action that prints the heading of a test
       -- group and the 'TestOutput' for that test group.
   | Skip -- ^ Inactive test (e.g. not matching the current pattern)
-  | Seq TestOutput TestOutput -- ^ Two sets of 'TestOuput' on the same level
+  | Seq TestOutput TestOutput -- ^ Two sets of 'TestOutput' on the same level
 
 -- The monoid laws should hold observationally w.r.t. the semantics defined
 -- in this module
@@ -503,7 +503,8 @@
 
 -- | Report only failed tests.
 --
--- At the moment, this option only works globally. As an argument to 'localOption', it does nothing.
+-- At the moment, this option only works globally. As an argument
+-- to 'Test.Tasty.localOption', it does nothing.
 newtype HideSuccesses = HideSuccesses Bool
   deriving (Eq, Ord, Typeable)
 instance IsOption HideSuccesses where
@@ -678,11 +679,12 @@
 --   (This only works properly on Unix at the moment; on Windows, the function
 --   treats every character as width-1 like 'Data.List.length' does.)
 stringWidth :: String -> Int
-#ifdef VERSION_wcwidth
+#ifdef USE_WCWIDTH
 stringWidth = Prelude.sum . map charWidth
- where charWidth c = case wcwidth c of
+ where charWidth c = case wcwidth (fromIntegral (ord c)) of
         -1 -> 1  -- many chars have "undefined" width; default to 1 for these.
-        w  -> w
+        w  -> fromIntegral w
+foreign import capi safe "wchar.h wcwidth" wcwidth :: CWchar -> CInt
 #else
 stringWidth = length
 #endif
diff --git a/Test/Tasty/Ingredients/IncludingOptions.hs b/Test/Tasty/Ingredients/IncludingOptions.hs
--- a/Test/Tasty/Ingredients/IncludingOptions.hs
+++ b/Test/Tasty/Ingredients/IncludingOptions.hs
@@ -7,6 +7,6 @@
 -- | This ingredient doesn't do anything apart from registering additional
 -- options.
 --
--- The option values can be accessed using 'askOption'.
+-- The option values can be accessed using 'Test.Tasty.askOption'.
 includingOptions :: [OptionDescription] -> Ingredient
 includingOptions opts = TestManager opts (\_ _ -> Nothing)
diff --git a/Test/Tasty/Options/Core.hs b/Test/Tasty/Options/Core.hs
--- a/Test/Tasty/Options/Core.hs
+++ b/Test/Tasty/Options/Core.hs
@@ -26,7 +26,8 @@
 --
 -- Note that this is /not/ included in 'coreOptions'.
 -- Instead, it's automatically included in the options for any
--- 'TestReporter' ingredient by 'ingredientOptions', because the way test
+-- 'Test.Tasty.Ingredients.TestReporter' ingredient by
+-- 'Test.Tasty.Ingredients.ingredientOptions', because the way test
 -- reporters are handled already involves parallelism. Other ingredients
 -- may also choose to include this option.
 newtype NumThreads = NumThreads { getNumThreads :: Int }
diff --git a/Test/Tasty/Patterns/Eval.hs b/Test/Tasty/Patterns/Eval.hs
--- a/Test/Tasty/Patterns/Eval.hs
+++ b/Test/Tasty/Patterns/Eval.hs
@@ -153,7 +153,7 @@
   -> Bool
 match pat str = pat `isInfixOf` str
 
--- | Run the 'M' monad with a given list of fields
+-- | Run the @M@ monad with a given list of fields
 --
 -- The field list should not include @$0@; it's calculated automatically.
 withFields :: Seq.Seq String -> M a -> Either String a
diff --git a/Test/Tasty/Patterns/Parser.hs b/Test/Tasty/Patterns/Parser.hs
--- a/Test/Tasty/Patterns/Parser.hs
+++ b/Test/Tasty/Patterns/Parser.hs
@@ -110,21 +110,21 @@
 --
 -- This roughly corresponds to the @unary_expr@ and @non_unary_expr@
 -- non-terminals in the awk grammar.
--- (Why roughly? See 'expr2'.)
+-- (Why roughly? See @expr2@.)
 data Unary = Unary | NonUnary
 
 -- | Arithmetic expressions.
 --
 -- Unlike awk, non-unary expressions disallow unary operators everywhere,
 -- not just in the leading position, to avoid extra complexity in
--- 'makeExprParser'.
+-- @makeExprParser@.
 --
 -- For example, the expression
 --
 -- >1 3 + -4
 --
 -- is valid in awk because @3 + -4@ is non-unary, but we disallow it here
--- because 'makeExprParser' does not allow us to distinguish it from
+-- because @makeExprParser@ does not allow us to distinguish it from
 --
 -- >1 -4 + 3
 --
diff --git a/Test/Tasty/Run.hs b/Test/Tasty/Run.hs
--- a/Test/Tasty/Run.hs
+++ b/Test/Tasty/Run.hs
@@ -11,6 +11,7 @@
 import qualified Data.IntMap as IntMap
 import qualified Data.Sequence as Seq
 import qualified Data.Foldable as F
+import Data.Int (Int64)
 import Data.Maybe
 import Data.Graph (SCC(..), stronglyConnComp)
 import Data.Typeable
@@ -21,7 +22,6 @@
 import Control.Monad.Trans.Writer (WriterT(..), execWriterT, mapWriterT, tell)
 import Control.Concurrent
 import Control.Concurrent.STM
-import Control.Concurrent.Timeout (timeout)
 import Control.Concurrent.Async
 import Control.Exception as E
 import Control.Applicative
@@ -30,6 +30,12 @@
 import GHC.Conc (labelThread)
 import Prelude  -- Silence AMP and FTP import warnings
 
+#ifdef MIN_VERSION_unbounded_delays
+import Control.Concurrent.Timeout (timeout)
+#else
+import System.Timeout (timeout)
+#endif
+
 import Test.Tasty.Core
 import Test.Tasty.Parallel
 import Test.Tasty.Patterns
@@ -171,7 +177,9 @@
             , resultTime = fromIntegral t
             , resultDetailsPrinter = noResultDetails
             }
-      fromMaybe timeoutResult <$> timeout t a
+      -- If compiled with unbounded-delays then t' :: Integer, otherwise t' :: Int
+      let t' = fromInteger (min (max 0 t) (toInteger (maxBound :: Int64)))
+      fromMaybe timeoutResult <$> timeout t' a
 
     -- destroyResources should not be interrupted by an exception
     -- Here's how we ensure this:
diff --git a/Test/Tasty/Runners/Utils.hs b/Test/Tasty/Runners/Utils.hs
--- a/Test/Tasty/Runners/Utils.hs
+++ b/Test/Tasty/Runners/Utils.hs
@@ -7,15 +7,15 @@
 import Control.Applicative
 import Control.Concurrent (mkWeakThreadId, myThreadId)
 import Control.Monad (forM_)
-#ifndef VERSION_clock
-import Data.Time.Clock.POSIX (getPOSIXTime)
-#endif
 import Data.Typeable (Typeable)
 import Prelude  -- Silence AMP import warnings
 import Text.Printf
 import Foreign.C (CInt)
-#ifdef VERSION_clock
-import qualified System.Clock as Clock
+
+#if MIN_VERSION_base(4,11,0)
+import GHC.Clock (getMonotonicTime)
+#else
+import Data.Time.Clock.POSIX (getPOSIXTime)
 #endif
 
 -- Install handlers only on UNIX
@@ -63,7 +63,7 @@
 --
 -- This function is called automatically from the @defaultMain*@ family of
 -- functions. You only need to call it explicitly if you call
--- 'tryIngredients' yourself.
+-- 'Test.Tasty.Runners.tryIngredients' yourself.
 --
 -- This function does nothing on non-UNIX systems or when compiled with GHC
 -- older than 7.6.
@@ -102,21 +102,13 @@
   end   <- getTime
   return (end-start, r)
 
-#ifdef VERSION_clock
+#if MIN_VERSION_base(4,11,0)
 -- | Get monotonic time
 --
 -- Warning: This is not the system time, but a monotonically increasing time
 -- that facilitates reliable measurement of time differences.
 getTime :: IO Time
-getTime = do
-  t <- Clock.getTime Clock.Monotonic
-  let ns = realToFrac $
-#if MIN_VERSION_clock(0,7,1)
-        Clock.toNanoSecs t
-#else
-        Clock.timeSpecAsNanoSecs t
-#endif
-  return $ ns / 10 ^ (9 :: Int)
+getTime = getMonotonicTime
 #else
 -- | Get system time
 getTime :: IO Time
diff --git a/tasty.cabal b/tasty.cabal
--- a/tasty.cabal
+++ b/tasty.cabal
@@ -1,6 +1,6 @@
 cabal-version:       >=1.10
 name:                tasty
-version:             1.4.2.3
+version:             1.4.3
 synopsis:            Modern and extensible testing framework
 description:         Tasty is a modern testing framework for Haskell.
                      It lets you combine your unit tests, golden
@@ -22,11 +22,6 @@
   location: git://github.com/UnkindPartition/tasty.git
   subdir:   core
 
-flag clock
-  description:
-    Depend on the clock package for more accurate time measurement
-  default: True
-
 flag unix
   description:
     Depend on the unix package to install signal handlers
@@ -70,18 +65,21 @@
     transformers         >= 0.5,
     tagged               >= 0.5,
     optparse-applicative >= 0.14,
-    unbounded-delays     >= 0.1,
     ansi-terminal        >= 0.9
+
+  -- No reason to depend on unbounded-delays on 64-bit architecture
+  if(!arch(x86_64) && !arch(aarch64))
+    build-depends:
+      unbounded-delays >= 0.1
+
   if(!impl(ghc >= 8.0))
     build-depends: semigroups
 
-  if flag(clock) && !impl(ghcjs)
-    build-depends: clock >= 0.4.4.0
-  else
-    build-depends: time  >= 1.4
+  if(!impl(ghc >= 8.4))
+    build-depends: time >= 1.4
 
   if !os(windows) && !impl(ghcjs)
-    build-depends: wcwidth
+    cpp-options: -DUSE_WCWIDTH
     if flag(unix)
       build-depends: unix