diff --git a/doc/changelog.rst b/doc/changelog.rst
index 378de1d6..6b57351a 100644
--- a/doc/changelog.rst
+++ b/doc/changelog.rst
@@ -1,6 +1,15 @@
 Changelog
 =========
 
+Version 2.6.3 (2024-03-05)
+---------------------------
+
+* Support Free-threading CPython (PEP-703) by disabling psutil related features.
+  Relevant issue: https://github.com/python/cpython/issues/116024.
+  Patch by Donghee Na.
+* Fix mem_max_rss measurement on macOS.
+  Patch by Mike Droettboom.
+
 Version 2.6.2 (2023-11-02)
 ---------------------------
 
diff --git a/pyperf/_collect_metadata.py b/pyperf/_collect_metadata.py
index e504ab6d..e69bc8ea 100644
--- a/pyperf/_collect_metadata.py
+++ b/pyperf/_collect_metadata.py
@@ -11,8 +11,11 @@
     resource = None
 
 try:
-    # Optional dependency
-    import psutil
+    from pyperf._utils import USE_PSUTIL
+    if not USE_PSUTIL:
+        psutil = None
+    else:
+        import psutil
 except ImportError:
     psutil = None
 
diff --git a/pyperf/_cpu_utils.py b/pyperf/_cpu_utils.py
index ea230109..f810df25 100644
--- a/pyperf/_cpu_utils.py
+++ b/pyperf/_cpu_utils.py
@@ -2,11 +2,13 @@
 import os
 import re
 
-from pyperf._utils import sysfs_path, proc_path, read_first_line
+from pyperf._utils import sysfs_path, proc_path, read_first_line, USE_PSUTIL
 
 try:
-    # Optional dependency
-    import psutil
+    if not USE_PSUTIL:
+        psutil = None
+    else:
+        import psutil
 except ImportError:
     psutil = None
 
@@ -152,7 +154,10 @@ def set_cpu_affinity(cpus):
         return True
 
     try:
-        import psutil
+        if not USE_PSUTIL:
+            return
+        else:
+            import psutil
     except ImportError:
         return
 
@@ -166,7 +171,10 @@ def set_cpu_affinity(cpus):
 
 def set_highest_priority():
     try:
-        import psutil
+        if not USE_PSUTIL:
+            return
+        else:
+            import psutil
     except ImportError:
         return
 
diff --git a/pyperf/_psutil_memory.py b/pyperf/_psutil_memory.py
index f56cfb4a..ca6776ed 100644
--- a/pyperf/_psutil_memory.py
+++ b/pyperf/_psutil_memory.py
@@ -1,6 +1,10 @@
 import os
 try:
-    import psutil
+    from pyperf._utils import USE_PSUTIL
+    if not USE_PSUTIL:
+        raise ImportError
+    else:
+        import psutil
 except ImportError:
     raise ImportError('psutil is not installed')
 import threading
diff --git a/pyperf/_utils.py b/pyperf/_utils.py
index a5ff155f..87bb1a7f 100644
--- a/pyperf/_utils.py
+++ b/pyperf/_utils.py
@@ -3,10 +3,14 @@
 import os
 import statistics
 import sys
+import sysconfig
 from shlex import quote as shell_quote   # noqa
 from shutil import which
 
-
+# Currently there is a packaging issue for PEP-703,
+# Until then psutil is disabled as a workaround.
+# See: https://github.com/python/cpython/issues/116024
+USE_PSUTIL = not bool(sysconfig.get_config_var('Py_GIL_DISABLED'))
 MS_WINDOWS = (sys.platform == 'win32')
 MAC_OS = (sys.platform == 'darwin')