diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,13 @@
 
 `hslua-module-system` uses [PVP Versioning][].
 
+## hslua-module-system-1.0.3
+
+Released 2023-02-14.
+
+-   Added new function `cputime` and field `cputime_precision`,
+    e.g. for benchmarking.
+
 ## hslua-module-system-1.0.2
 
 Released 2022-02-19.
@@ -10,7 +17,7 @@
 
 ## hslua-module-system-1.0.1
 
-Released 29-01-2022.
+Released 2022-01-29.
 
 -   Relaxed upper bound of hslua-core, hslua-marshalling, and
     hslua-packaging, allowing their respective version 2.1.
diff --git a/hslua-module-system.cabal b/hslua-module-system.cabal
--- a/hslua-module-system.cabal
+++ b/hslua-module-system.cabal
@@ -1,6 +1,6 @@
 cabal-version:       2.2
 name:                hslua-module-system
-version:             1.0.2
+version:             1.0.3
 synopsis:            Lua module wrapper around Haskell's System module.
 
 description:         Provides access to system information and
@@ -19,14 +19,13 @@
 category:            Foreign
 extra-source-files:  CHANGELOG.md
                    , test/test-system.lua
-tested-with:         GHC == 8.0.2
-                   , GHC == 8.2.2
-                   , GHC == 8.4.4
+tested-with:         GHC == 8.4.4
                    , GHC == 8.6.5
                    , GHC == 8.8.3
                    , GHC == 8.10.7
-                   , GHC == 9.0.1
-                   , GHC == 9.2.1
+                   , GHC == 9.0.2
+                   , GHC == 9.2.5
+                   , GHC == 9.4.4
 
 source-repository head
   type:              git
@@ -36,7 +35,7 @@
 common common-options
   default-language:    Haskell2010
   build-depends:       base                 >= 4.8    && < 5
-                     , hslua-core           >= 2.1    && < 2.3
+                     , hslua-core           >= 2.1    && < 2.4
                      , hslua-packaging      >= 2.1    && < 2.3
                      , text                 >= 1.2    && < 2.1
   default-extensions:  LambdaCase
@@ -72,5 +71,5 @@
   build-depends:       hslua-module-system
                      , tasty                >= 0.11
                      , tasty-hunit          >= 0.9
-                     , tasty-lua            >= 1.0    && < 1.1
+                     , tasty-lua            >= 1.0    && < 1.2
                      , text
diff --git a/src/HsLua/Module/System.hs b/src/HsLua/Module/System.hs
--- a/src/HsLua/Module/System.hs
+++ b/src/HsLua/Module/System.hs
@@ -20,9 +20,10 @@
   , os
 
   -- ** Functions
+  , cputime
   , env
-  , getwd
   , getenv
+  , getwd
   , ls
   , mkdir
   , rmdir
@@ -47,6 +48,7 @@
 
 import qualified Data.Text as T
 import qualified HsLua.Core as Lua
+import qualified System.CPUTime as CPUTime
 import qualified System.Directory as Directory
 import qualified System.Environment as Env
 import qualified System.Info as Info
@@ -60,10 +62,12 @@
       [ arch
       , compiler_name
       , compiler_version
+      , cputime_precision
       , os
       ]
   , moduleFunctions =
-      [ env
+      [ cputime
+      , env
       , getenv
       , getwd
       , ls
@@ -117,6 +121,18 @@
                      versionBranch Info.compilerVersion
   }
 
+-- | Field containing the smallest measurable difference in CPU time.
+cputime_precision :: Field e
+cputime_precision = Field
+  { fieldName = "cputime_precision"
+  , fieldDescription = T.unlines
+      [ "The smallest measurable difference in CPU time that the"
+      , "implementation can record, and is given as an integral number of"
+      , "picoseconds."
+      ]
+  , fieldPushValue = pushIntegral CPUTime.cpuTimePrecision
+  }
+
 -- | Field containing the operating system on which the program is
 -- running.
 os :: Field e
@@ -130,6 +146,18 @@
 --
 -- Functions
 --
+
+-- | Access the CPU time, e.g. for benchmarking.
+cputime :: LuaError e => DocumentedFunction e
+cputime = defun "cputime"
+  ### ioToLua CPUTime.getCPUTime
+  =#> functionResult pushIntegral "integer" "CPU time in picoseconds"
+  #? T.unlines
+     [ "Returns the number of picoseconds CPU time used by the current"
+     , "program. The precision of this result may vary in different"
+     , "versions and on different platforms. See also the field"
+     , "`cputime_precision`."
+     ]
 
 -- | Retrieve the entire environment
 env :: LuaError e => DocumentedFunction e
diff --git a/test/test-system.lua b/test/test-system.lua
--- a/test/test-system.lua
+++ b/test/test-system.lua
@@ -43,8 +43,17 @@
     test('compiler_version', function ()
       assert.are_equal(type(system.compiler_version), 'table')
     end),
+    test('cputime_precision', function ()
+      assert.are_equal(type(system.cputime_precision), 'number')
+    end),
     test('os', function ()
       assert.are_equal(type(system.os), 'string')
+    end),
+  },
+
+  group 'cputime' {
+    test('returns a number', function ()
+      assert.are_equal(type(system.cputime()), 'number')
     end),
   },