diff --git a/notebooks/DicomWidget.ipynb b/notebooks/DicomWidget.ipynb
index 0fd965d..6280310 100644
--- a/notebooks/DicomWidget.ipynb
+++ b/notebooks/DicomWidget.ipynb
@@ -94,7 +94,8 @@
    "outputs": [],
    "source": [
     "# create demo array just to demonstrate the usage of the API\n",
-    "data = np.random.rand(255,255,255)"
+    "rng = np.random.default_rng()\n",
+    "data = rng.random((255,255,255))"
    ]
   },
   {
diff --git a/notebooks/TimeSeriesArray.ipynb b/notebooks/TimeSeriesArray.ipynb
index 57844ff..089c987 100644
--- a/notebooks/TimeSeriesArray.ipynb
+++ b/notebooks/TimeSeriesArray.ipynb
@@ -26,7 +26,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 1,
+   "execution_count": null,
    "id": "56d5c4b6-7804-46d6-931f-fcc5593977d1",
    "metadata": {},
    "outputs": [],
@@ -38,21 +38,13 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 3,
+   "execution_count": null,
    "id": "28420169-2274-4e0e-a73d-c1ab54e6da9c",
    "metadata": {
     "scrolled": true,
     "tags": []
    },
-   "outputs": [
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "12-05-2023 03:15:02 - INFO - tvbwidgets.core.pse.parameters - ImportError: Dask dependency is not included, so this functionality won't be available\n"
-     ]
-    }
-   ],
+   "outputs": [],
    "source": [
     "import numpy as np\n",
     "from tvbwidgets.api import plot_timeseries"
@@ -73,7 +65,8 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "raw = np.random.rand(30000, 50)"
+    "rng = np.random.default_rng()\n",
+    "raw = rng.random((30000, 50))"
    ]
   },
   {
@@ -103,6 +96,14 @@
    "source": [
     "tsw = plot_timeseries(data=raw, sample_freq=0.1, ch_idx=1, backend=backend)"
    ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "a26933b8-b43f-4442-8af1-b79565293e9b",
+   "metadata": {},
+   "outputs": [],
+   "source": []
   }
  ],
  "metadata": {
@@ -121,7 +122,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.9.16"
+   "version": "3.9.18"
   }
  },
  "nbformat": 4,
diff --git a/tvbwidgets/ui/connectivity_matrix_editor_widget.py b/tvbwidgets/ui/connectivity_matrix_editor_widget.py
index e60b91c..51dbdc3 100644
--- a/tvbwidgets/ui/connectivity_matrix_editor_widget.py
+++ b/tvbwidgets/ui/connectivity_matrix_editor_widget.py
@@ -16,8 +16,12 @@
 import matplotlib.colors as mcolors
 from IPython.display import display
 from tvb.datatypes.connectivity import Connectivity
+
+from tvbwidgets import get_logger
 from tvbwidgets.ui.base_widget import TVBWidget
 
+LOGGER = get_logger(__name__)
+
 
 class ConnectivityMatrixEditor(TVBWidget):
     def __init__(self, connectivity, size=None, **kwargs):
@@ -49,7 +53,7 @@ def _make_header(self):
 
         self.change_button = widgets.Button(description="Change",
                                             layout=widgets.Layout(width="80px", visibility="hidden"))
-        self.change_button.on_click(lambda change: self.on_apply_change(change))
+        self.change_button.on_click(self.on_apply_change)
 
         self.save_button = widgets.Button(description="Save",
                                           layout=widgets.Layout(width="100px", margin='0 0 0 auto'))
@@ -239,7 +243,8 @@ def on_apply_change(self, change):
         matrix_ui = getattr(self, matrix_name)
         try:
             value = float(self.cell_value.value)
-        except:
+        except (ValueError, TypeError):
+            LOGGER.error(f'An exception occurred when retrieving the cell value.')
             value = None
 
         if value is not None:
diff --git a/tvbwidgets/ui/spacetime_widget.py b/tvbwidgets/ui/spacetime_widget.py
index b076702..5616b34 100644
--- a/tvbwidgets/ui/spacetime_widget.py
+++ b/tvbwidgets/ui/spacetime_widget.py
@@ -94,7 +94,7 @@ def _prepare_slices(self):
           
 
     def _create_graph_slice(self, i):
-        z_coordinate = -i*3 + 14 if i is 0 else -i*2 + 11 - 0.1*i*i
+        z_coordinate = -i*3 + 14 if i == 0 else -i*2 + 11 - 0.1*i*i
         return p3.Mesh(
             p3.BoxBufferGeometry(width=7, height=7, depth=0.1),
             p3.MeshPhysicalMaterial(),