diff --git a/.python-version b/.python-version
index f811d15..eedede7 100644
--- a/.python-version
+++ b/.python-version
@@ -1,4 +1,4 @@
-3.9.0
-3.8.6
-3.7.9
-3.6.12
+3.9.9
+3.8.12
+3.7.12
+3.6.15
diff --git a/AUTHORS.rst b/AUTHORS.rst
index ad4a771..9b7ab44 100644
--- a/AUTHORS.rst
+++ b/AUTHORS.rst
@@ -14,5 +14,6 @@ Other contributions from:
 * Loïs Taulelle (@ltaulell)
 * Jan Pipek (@janpipek)
 * Kees Hink (@khink)
+* @terra-alex
 
 Thank you!
diff --git a/CHANGES.rst b/CHANGES.rst
index 268beb7..e7519d3 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -1,6 +1,14 @@
 CHANGES
 =======
 
+v2.1.0, 2021-12-30
+----------------
+
+* Calculate time in HR zones. Thanks @khink (#41)
+* Don't throw exceptions when certain data is missing. Thanks @terra-alex (#74)
+* Minor updates to dependencies. Thanks pyup-bot
+
+
 v2.0.0, 2020-12-20
 ------------------
 
diff --git a/LICENSE b/LICENSE
index 6268a9b..7b97cc8 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,4 +1,4 @@
-Copyright (c) 2013-2021, Vinod Kurup
+Copyright (c) 2013-2022, Vinod Kurup
 All rights reserved.
 
 Redistribution and use in source and binary forms, with or without modification,
diff --git a/setup.py b/setup.py
index b874b36..ac543f0 100644
--- a/setup.py
+++ b/setup.py
@@ -1,6 +1,6 @@
 from setuptools import find_packages, setup
 
-__version__ = "2.0.0"
+__version__ = "2.1.0"
 
 setup(
     name="python-tcxparser",
diff --git a/tcxparser/tcxparser.py b/tcxparser/tcxparser.py
index 9835172..090379e 100644
--- a/tcxparser/tcxparser.py
+++ b/tcxparser/tcxparser.py
@@ -106,7 +106,11 @@ def completed_at(self):
 
     @property
     def cadence_avg(self):
-        return self.activity.Lap[-1].Cadence if hasattr(self.activity.Lap[-1], "Cadence") else None
+        return (
+            self.activity.Lap[-1].Cadence
+            if hasattr(self.activity.Lap[-1], "Cadence")
+            else None
+        )
 
     @property
     def distance(self):