diff --git a/ctapipe/io/tests/test_metadata.py b/ctapipe/io/tests/test_metadata.py
index 1a9177f89af..a69e9be76ab 100644
--- a/ctapipe/io/tests/test_metadata.py
+++ b/ctapipe/io/tests/test_metadata.py
@@ -115,7 +115,7 @@ def test_from_dict():
             data_association="Subarray",
             data_model_name="Unofficial DL1",
             data_model_version="1.0",
-            data_model_url="http://google.com",
+            data_model_url="https://example.org",
             format="hdf5",
         ),
         process=meta.Process(type_="Simulation", subtype="Prod3b", id_="423442"),
diff --git a/ctapipe/visualization/bokeh.py b/ctapipe/visualization/bokeh.py
index cdfeceebf7b..0a764ac70b9 100644
--- a/ctapipe/visualization/bokeh.py
+++ b/ctapipe/visualization/bokeh.py
@@ -1,6 +1,6 @@
 import sys
-import tempfile
 from abc import ABCMeta
+from tempfile import NamedTemporaryFile
 
 import astropy.units as u
 import matplotlib.pyplot as plt
@@ -134,7 +134,10 @@ def show(self):
             output_notebook()
         else:
             # this only sets the default name, created only when show is called
-            output_file(tempfile.mktemp(prefix="ctapipe_bokeh_", suffix=".html"))
+            tmp = NamedTemporaryFile(
+                delete=False, prefix="ctapipe_bokeh_", suffix=".html"
+            )
+            output_file(tmp.name)
 
         self._handle = show(self.figure, notebook_handle=self._use_notebook)
 
diff --git a/docs/conf.py b/docs/conf.py
index 14524efb707..1ed5c080949 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -389,7 +389,7 @@ def setup(app):
     "numpy": ("https://numpy.org/doc/stable/", None),
     "scipy": ("https://docs.scipy.org/doc/scipy/", None),
     "astropy": ("https://docs.astropy.org/en/latest/", None),
-    "pytables": ("http://www.pytables.org/", None),
+    "pytables": ("https://www.pytables.org/", None),
     "pandas": ("https://pandas.pydata.org/pandas-docs/stable/", None),
     "matplotlib": ("https://matplotlib.org/stable", None),
     "cython": ("https://docs.cython.org/en/latest/", None),