diff --git a/nbparameterise/code_drivers/python.py b/nbparameterise/code_drivers/python.py
index 6101d62..0171a21 100644
--- a/nbparameterise/code_drivers/python.py
+++ b/nbparameterise/code_drivers/python.py
@@ -28,6 +28,8 @@ def check_fillable_node(node, path):
         return
     elif isinstance(node, ast.NameConstant) and (node.value in (True, False)):
         return
+    elif isinstance(node, ast.NameConstant) and (node.value is None):
+        return
     elif isinstance(node, ast.List):
         for n in node.elts:
             check_fillable_node(n, path)
@@ -39,7 +41,7 @@ def check_fillable_node(node, path):
             check_fillable_node(n, path)
         return
     
-    raise astcheck.ASTMismatch(path, node, 'number, string, boolean, list or dict')
+    raise astcheck.ASTMismatch(path, node, 'none, number, string, boolean, list or dict')
 
 definition_pattern = ast.Assign(targets=[ast.Name()], value=check_fillable_node)
 
@@ -54,6 +56,8 @@ def type_and_value(node, comments={}):
         return list, [type_and_value(n)[1] for n in node.elts], comment
     elif isinstance(node, ast.NameConstant) and (node.value in (True, False)):
         return bool, node.value, comment
+    elif isinstance(node, ast.NameConstant) and (node.value is None):
+        return type(None), node.value, comment
     elif isinstance(node, ast.Dict):
         return dict, {type_and_value(node.keys[i])[1]: type_and_value(node.values[i])[1] for i in range(len(node.keys))}, comment
     elif isinstance(node, ast.UnaryOp):
diff --git a/tests/sample.ipynb b/tests/sample.ipynb
index 48a7e6e..5c3028d 100644
--- a/tests/sample.ipynb
+++ b/tests/sample.ipynb
@@ -21,6 +21,7 @@
     "d = False  # comment:bool\n",
     "e = [0, 1.0, True, \"text\", [0, 1]]\n",
     "f = {0: 0, \"item\": True, \"dict\": {0: \"text\"}}  # comment:dict\n",
+    "g = None\n",
     "print(\"This should be ignored\")"
    ]
   },
diff --git a/tests/test_basic.py b/tests/test_basic.py
index 4840661..8ba3424 100644
--- a/tests/test_basic.py
+++ b/tests/test_basic.py
@@ -22,6 +22,7 @@ def test_extract(self):
             Parameter('d', bool, False),
             Parameter('e', list, [0, 1.0, True, "text", [0, 1]]),
             Parameter('f', dict, {0: 0, "item": True, "dict": {0: "text"}}),
+            Parameter('g', type(None), None),
         ]
         assert self.params[4].comment == '# comment:bool'
         assert self.params[6].comment == '# comment:dict'
@@ -50,16 +51,18 @@ def test_rebuild(self):
     def test_new_values(self):
         params = code.parameter_values(self.params,
             a = "New text",
-            c = 12.0
+            c = 12.0,
+            g = "Not none",
         )
 
-        assert [p.name for p in params] == ['a', 'b', 'b2', 'c', 'd', 'e', 'f']
+        assert [p.name for p in params] == ['a', 'b', 'b2', 'c', 'd', 'e', 'f', 'g']
 
         assert params[0].value == 'New text'
         assert params[1].value == 12
         assert params[3].value == 12.0
         assert isinstance(params[3].value, float)
         assert params[4].value == False
+        assert params[7].value == "Not none"
 
 
 def test_parameter_repr():