diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index fe69d50..db9ae28 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -5,8 +5,9 @@ Changelog
 1.6.2 (2020-12-29)
 ------------------
 
+ - (Added) Support for Python 3.9.
  - (Fixed) Remove deprecated import from ``collections`` (`#101 <https://github.com/AlexandreDecan/sismic/pull/101>`__).
-
+ - (Fixed) Remove deprecated ``threading.isAlive`` used in ``sismic.runner.AsyncRunner``.
 
 
 1.6.1 (2020-07-10)
diff --git a/setup.py b/setup.py
index 644312a..d61ce73 100644
--- a/setup.py
+++ b/setup.py
@@ -41,6 +41,7 @@
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',
+        'Programming Language :: Python :: 3.9',
     ],
     keywords='statechart state machine interpreter model uml scxml harel',
 
diff --git a/tests/test_runner.py b/tests/test_runner.py
index a6d9d8e..62ecee2 100644
--- a/tests/test_runner.py
+++ b/tests/test_runner.py
@@ -1,6 +1,6 @@
 import pytest
 
-from time import sleep 
+from time import sleep
 
 from sismic.runner import AsyncRunner
 from sismic.interpreter import Interpreter
@@ -26,11 +26,11 @@ class MockedRunner(AsyncRunner):
             before_execute = mocker.MagicMock()
             after_execute = mocker.MagicMock()
             after_run = mocker.MagicMock()
-        
+
         r = MockedRunner(interpreter, interval=0)
         yield r
         r.stop()
-        
+
     def test_not_yet_started(self, runner):
         assert runner.interpreter.configuration == []
 
@@ -46,7 +46,7 @@ def test_start(self, runner):
         runner.start()
         sleep(self.INTERVAL)
         assert runner.interpreter.configuration == ['root', 's1']
-        
+
         runner.interpreter.queue('goto s2')
         sleep(self.INTERVAL)
         assert runner.interpreter.configuration == ['root', 's3']
@@ -57,7 +57,7 @@ def test_restart_stopped(self, runner):
 
         with pytest.raises(RuntimeError, match='Cannot restart'):
             runner.start()
-        
+
         assert not runner.running
 
     def test_start_again(self, runner):
@@ -65,7 +65,7 @@ def test_start_again(self, runner):
 
         with pytest.raises(RuntimeError, match='already started'):
             runner.start()
-        
+
         assert runner.running
         runner.stop()
         assert not runner.running
@@ -79,9 +79,9 @@ def test_hooks(self, mocked_runner):
         mocked_runner.start()
         sleep(self.INTERVAL)
         assert len(mocked_runner.before_run.call_args_list) == 1
-        
+
         sleep(self.INTERVAL)
-        
+
         assert len(mocked_runner.before_execute.call_args_list) > 0
         assert len(mocked_runner.after_execute.call_args_list) > 0
 
@@ -90,7 +90,7 @@ def test_hooks(self, mocked_runner):
         sleep(self.INTERVAL)
         assert len(mocked_runner.after_run.call_args_list) == 1
 
-            
+
     def test_final(self, runner):
         runner.start()
         runner.interpreter.queue('goto s2')
@@ -100,7 +100,7 @@ def test_final(self, runner):
         assert runner.interpreter.final
         assert not runner.running
         sleep(self.INTERVAL)  # Wait for the thread to finish
-        assert not runner._thread.isAlive()
+        assert not runner._thread.is_alive()
 
     def test_pause(self, runner):
         runner.start()
@@ -111,7 +111,7 @@ def test_pause(self, runner):
         assert runner.paused
         assert runner.running
         assert runner.interpreter.configuration == ['root', 's1']
-        
+
         runner.interpreter.queue('goto s2')
         sleep(self.INTERVAL)
         assert runner.interpreter.configuration == ['root', 's1']
@@ -122,7 +122,7 @@ def test_pause(self, runner):
         sleep(self.INTERVAL)
         assert runner.interpreter.configuration == ['root', 's3']
 
-        
+
     def test_state(self, runner):
         assert not runner.running
         assert not runner.paused