diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,5 +1,9 @@
 # Changelog for unliftio
 
+## 0.2.20.1
+
+* Fix time-osx.c for aarch64 mac [#91](https://github.com/fpco/unliftio/pull/91)
+
 ## 0.2.20
 
 * Add lifted `System.IO.openFile` (https://github.com/fpco/unliftio/pull/88)
diff --git a/cbits/time-osx.c b/cbits/time-osx.c
--- a/cbits/time-osx.c
+++ b/cbits/time-osx.c
@@ -1,20 +1,13 @@
 /* From https://github.com/bos/criterion */
 
 #include <mach/mach.h>
-#include <mach/mach_time.h>
-
-static mach_timebase_info_data_t timebase_info;
-static double timebase_recip;
+#include <time.h>
 
 void unliftio_inittime(void)
 {
-    if (timebase_recip == 0) {
-	mach_timebase_info(&timebase_info);
-	timebase_recip = (timebase_info.denom / timebase_info.numer) / 1e9;
-    }
 }
 
 double unliftio_gettime(void)
 {
-    return mach_absolute_time() * timebase_recip;
+    return clock_gettime_nsec_np(CLOCK_UPTIME_RAW);
 }
diff --git a/src/UnliftIO/Temporary.hs b/src/UnliftIO/Temporary.hs
--- a/src/UnliftIO/Temporary.hs
+++ b/src/UnliftIO/Temporary.hs
@@ -4,6 +4,42 @@
 -- Strongly inspired by\/stolen from the <https://github.com/feuerbach/temporary> package.
 --
 -- @since 0.1.0.0
+--
+-- === __Copyright notice:__
+--
+-- The following copyright notice is taken from <https://github.com/feuerbach/temporary>
+-- and is reproduced here as part of license terms of that package, of which this module is
+-- a derivate work.
+--
+-- @
+-- Copyright
+--   (c) 2003-2006, Isaac Jones
+--   (c) 2005-2009, Duncan Coutts
+--   (c) 2008, Maximilian Bolingbroke
+--   ... and other contributors
+--
+-- All rights reserved.
+--
+-- Redistribution and use in source and binary forms, with or without modification, are permitted
+-- provided that the following conditions are met:
+--
+--     * Redistributions of source code must retain the above copyright notice, this list of
+--       conditions and the following disclaimer.
+--     * Redistributions in binary form must reproduce the above copyright notice, this list of
+--       conditions and the following disclaimer in the documentation and/or other materials
+--       provided with the distribution.
+--     * Neither the name of Maximilian Bolingbroke nor the names of other contributors may be used to
+--       endorse or promote products derived from this software without specific prior written permission.
+--
+-- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
+-- IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+-- FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+-- CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+-- DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+-- DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
+-- IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+-- OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+-- @
 module UnliftIO.Temporary
   ( withSystemTempFile
   , withSystemTempDirectory
diff --git a/unliftio.cabal b/unliftio.cabal
--- a/unliftio.cabal
+++ b/unliftio.cabal
@@ -5,7 +5,7 @@
 -- see: https://github.com/sol/hpack
 
 name:           unliftio
-version:        0.2.20
+version:        0.2.20.1
 synopsis:       The MonadUnliftIO typeclass for unlifting monads to IO (batteries included)
 description:    Please see the documentation and README at <https://www.stackage.org/package/unliftio>
 category:       Control