diff --git a/chronos.cabal b/chronos.cabal
--- a/chronos.cabal
+++ b/chronos.cabal
@@ -2,7 +2,7 @@
 name:
   chronos
 version:
-  1.0.9
+  1.1
 synopsis:
   A performant time library
 description:
@@ -61,7 +61,6 @@
     , attoparsec >= 0.13 && < 0.14
     , base >= 4.9 && < 5
     , bytestring >= 0.10 && < 0.11
-    , clock >= 0.7 && < 0.9
     , hashable >= 1.2 && < 1.4
     , primitive >= 0.6.4 && < 0.8
     , semigroups >= 0.16 && < 0.20
@@ -70,6 +69,8 @@
     , vector >= 0.11 && < 0.13
   if os(windows)
     build-depends: Win32 >= 2.2 && < 2.9
+  if impl(ghc < 8.4)
+    build-depends: clock >= 0.7 && < 0.9
   default-language:
     Haskell2010
   c-sources:
diff --git a/src/Chronos.hs b/src/Chronos.hs
--- a/src/Chronos.hs
+++ b/src/Chronos.hs
@@ -5,6 +5,7 @@
   , GeneralizedNewtypeDeriving
   , MultiParamTypeClasses
   , OverloadedStrings
+  , RecordWildCards
   , ScopedTypeVariables
   , TypeFamilies
   , TypeInType
@@ -46,8 +47,10 @@
     -- ** Duration
   , stopwatch
   , stopwatch_
+#if !MIN_VERSION_base(4,11,0)
   , stopwatchWith
   , stopwatchWith_
+#endif
     -- ** Construction
   , datetimeFromYmdhms
   , timeFromYmdhms
@@ -276,7 +279,11 @@
 import qualified Data.Vector.Generic.Mutable as MGVector
 import qualified Data.Vector.Primitive as PVector
 import qualified Data.Vector.Unboxed as UVector
+#if MIN_VERSION_base(4,11,0)
+import GHC.Clock (getMonotonicTimeNSec)
+#else
 import qualified System.Clock as CLK
+#endif
 
 #ifdef mingw32_HOST_OS
 import System.Win32.Time (SYSTEMTIME(..))
@@ -486,10 +493,32 @@
 epoch :: Time
 epoch = Time 0
 
+#if MIN_VERSION_base(4,11,0)
 -- | Measures the time it takes to run an action and evaluate
 --   its result to WHNF. This measurement uses a monotonic clock
 --   instead of the standard system clock.
 stopwatch :: IO a -> IO (Timespan, a)
+stopwatch action = do
+  start <- getMonotonicTimeNSec
+  a <- action >>= evaluate
+  end <- getMonotonicTimeNSec
+  pure ((Timespan (fromIntegral (end - start))), a)
+
+-- | Measures the time it takes to run an action. The result
+--   is discarded. This measurement uses a monotonic clock
+--   instead of the standard system clock.
+stopwatch_ :: IO a -> IO Timespan
+stopwatch_ action = do
+  start <- getMonotonicTimeNSec
+  _ <- action
+  end <- getMonotonicTimeNSec
+  pure (Timespan (fromIntegral (end - start)))
+#else
+
+-- | Measures the time it takes to run an action and evaluate
+--   its result to WHNF. This measurement uses a monotonic clock
+--   instead of the standard system clock.
+stopwatch :: IO a -> IO (Timespan, a)
 stopwatch = stopwatchWith CLK.Monotonic
 
 -- | Measures the time it takes to run an action. The result
@@ -507,6 +536,7 @@
   a <- action >>= evaluate
   end <- CLK.getTime c
   pure (timeSpecToTimespan (CLK.diffTimeSpec end start),a)
+{-# DEPRECATED stopwatchWith "stopwatchWith will be removed in a future majour version" #-}
 
 -- | Variant of 'stopwatch_' that accepts a clock type.
 stopwatchWith_ :: CLK.Clock -> IO a -> IO Timespan
@@ -515,9 +545,11 @@
   _ <- action
   end <- CLK.getTime c
   pure (timeSpecToTimespan (CLK.diffTimeSpec end start))
+{-# DEPRECATED stopwatchWith_ "stopwatchWith_ will be removed in a future majour version" #-}
 
 timeSpecToTimespan :: CLK.TimeSpec -> Timespan
 timeSpecToTimespan (CLK.TimeSpec s ns) = Timespan (s * 1000000000 + ns)
+#endif
 
 -- UtcTime. Used internally only.
 data UtcTime = UtcTime