1diff --git a/stytra/gui/fishplots.py b/stytra/gui/fishplots.py
2index 49ef1fe..fd1cc50 100644
3--- a/stytra/gui/fishplots.py
4+++ b/stytra/gui/fishplots.py
5@@ -13,7 +13,7 @@ from lightparam.gui import ParameterGui
6 from scipy.ndimage.filters import gaussian_filter1d
7
8
9-class StreamingPositionPlot(pg.GraphicsWindow):
10+class StreamingPosition(pg.GraphicsView):
11 """Plot that displays the virtual position of the fish"""
12
13 def __init__(self, *args, data_accumulator, n_points=500, **kwargs):
14diff --git a/stytra/utilities.py b/stytra/utilities.py
15index f79c4db..feaa7ef 100644
16--- a/stytra/utilities.py
17+++ b/stytra/utilities.py
18@@ -239,7 +239,7 @@ def recursive_update(d, u):
19 :return:
20 """
21 for k, v in u.items():
22- if isinstance(v, collections.Mapping):
23+ if isinstance(v, collections.ChainMap):
24 d[k] = recursive_update(d.get(k, {}), v)
25 else:
26 d[k] = v