diff --git a/Changelog.rst b/Changelog.rst
index e62e85d31b..4098f23ee2 100644
--- a/Changelog.rst
+++ b/Changelog.rst
@@ -1,13 +1,16 @@
 version 3.13.1
 --------------
 
-**2022-??-??**
+**2022-07-??**
 
+* Upgrade to allow cf to work with Python 3.10
+  (https://github.com/NCAS-CMS/cf-python/issues/419)
 * Fix bug when setting coordinate bounds with different units to their
   parent coordinates
   (https://github.com/NCAS-CMS/cf-python/issues/417)
 
 ----
+
 version 3.13.0
 --------------
 
diff --git a/cf/test/test_decorators.py b/cf/test/test_decorators.py
index 759743aa39..576d5c4f55 100644
--- a/cf/test/test_decorators.py
+++ b/cf/test/test_decorators.py
@@ -147,7 +147,7 @@ def test_manage_log_level_via_verbose_attr(self):
             # all messages should appear, regardless of global log_level:
             for attr in (-1, "DEBUG", "debug", "Debug", "DeBuG"):
                 test_class.verbose = attr
-                with self.assertLogs(level=cf.log_level().value) as catch:
+                with self.assertLogs(level=-1) as catch:
                     test_class.decorated_logging_func()
                     for msg in log_message:
                         self.assertIn(msg, catch.output)
@@ -157,7 +157,7 @@ def test_manage_log_level_via_verbose_attr(self):
             # regardless of global log_level value set:
             for attr in (1, "WARNING", "warning", "Warning", "WaRning"):
                 test_class.verbose = attr
-                with self.assertLogs(level=cf.log_level().value) as catch:
+                with self.assertLogs(level=1) as catch:
                     test_class.decorated_logging_func()
                     for msg in log_message:
                         if msg.split(":")[0] == "WARNING":
@@ -169,7 +169,7 @@ def test_manage_log_level_via_verbose_attr(self):
 
             # ... verbose=2 should be equivalent to verbose=3 now:
             test_class.verbose = True
-            with self.assertLogs(level=cf.log_level().value) as catch:
+            with self.assertLogs(level=3) as catch:
                 test_class.decorated_logging_func()
                 for msg in log_message:
                     if msg.split(":")[0] == "DEBUG":
diff --git a/docs/source/installation.rst b/docs/source/installation.rst
index 2b567a1965..9bb640ab87 100644
--- a/docs/source/installation.rst
+++ b/docs/source/installation.rst
@@ -32,7 +32,7 @@ Windows Subsystem for Linux (WSL)
 **Python versions**
 -------------------
 
-The cf package is only for Python 3.7, 3.8 and 3.9.
+The cf package is only for Python 3.7 or newer.
 
 Versions 2.x of cf work only for Python 2.7.
 
@@ -138,7 +138,7 @@ To install from source (without any dependencies):
 1. Download the cf package from https://pypi.org/project/cf-python
 
 2. Unpack the library (replacing ``<version>`` with the version that
-   you want to install, e.g. ``3.13.0``):
+   you want to install, e.g. ``3.13.1``):
 
    .. code-block:: console
 
@@ -199,7 +199,7 @@ installed, which
 Required
 ^^^^^^^^
 
-* `Python <https://www.python.org/>`_, 3.7, 3.8 or 3.9.
+* `Python <https://www.python.org/>`_, 3.7 or newer.
 
 * `numpy <https://pypi.org/project/numpy/>`_, 1.15 or newer.
 
diff --git a/requirements.txt b/requirements.txt
index d8ec988199..52ee4ce049 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,7 @@
 netCDF4>=1.5.4
 cftime>=1.5.0
 numpy>=1.15
-cfdm>=1.9.0.2, <1.9.1.0
+cfdm>=1.9.0.4, <1.9.1.0
 psutil>=0.6.0
 cfunits>=3.3.4
 packaging>=20.0