diff --git a/buildingspy/CHANGES.txt b/buildingspy/CHANGES.txt
index 5ae70327..8a3f91c7 100644
--- a/buildingspy/CHANGES.txt
+++ b/buildingspy/CHANGES.txt
@@ -1,6 +1,12 @@
 BuildingsPy Changelog
 ---------------------
 
+Version 5.2.1, xxxx
+^^^^^^^^^^^^^^^^^^^
+
+- Updated regression tests to avoid blocking web server.
+  (https://github.com/lbl-srg/BuildingsPy/issues/605)
+
 Version 5.2.0, March 14, 2025
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
diff --git a/buildingspy/development/regressiontest.py b/buildingspy/development/regressiontest.py
index e4a3375a..447960f9 100644
--- a/buildingspy/development/regressiontest.py
+++ b/buildingspy/development/regressiontest.py
@@ -2222,8 +2222,8 @@ def _compareResults(self, data_idx, oldRefFulFilNam, y_sim, y_tra, refFilNam, an
                             noOldResults.append(varNam)
             if len(errors) > 0:
                 self._reporter.writeError(
-                    "{}: Errors during result verification.\n           {}".format(
-                        refFilNam, '\n           '.join(errors)))
+                    "{} has errors during result verification.\n           {}".format(
+                        model_name, '\n           '.join(errors)))
         # Compare the simulation statistics
         # There are these cases:
         # 1. The old reference results have no statistics, in which case new results may be written.
@@ -2261,7 +2261,9 @@ def _compareResults(self, data_idx, oldRefFulFilNam, y_sim, y_tra, refFilNam, an
                     print("(Close plot window to continue.)")
                     self._legacy_plot(y_sim, t_ref, y_ref, noOldResults, timOfMaxErr, matFilNam)
                 else:
-                    self._funnel_plot(model_name)
+                    idx = next(i for i, el in enumerate(self._comp_info) if el['model'] == model_name)
+                    comp_data = self._comp_info[idx]['comparison']
+                    Tester._funnel_plot(comp_data, self._PLOT_TEMPLATE)
 
             while not (ans == "n" or ans == "y" or ans == "Y" or ans == "N"):
                 ans = input("             Enter: y(yes), n(no), Y(yes for all), N(no for all): ")
@@ -2272,11 +2274,10 @@ def _compareResults(self, data_idx, oldRefFulFilNam, y_sim, y_tra, refFilNam, an
 
         return (updateReferenceData, (newTrajectories or newStatistics), ans)
 
-    def _funnel_plot(self, model_name, browser=None):
+    @staticmethod
+    def _funnel_plot(comp_data, plot_template):
         """Plot comparison results generated by pyfunnel."""
 
-        idx = next(i for i, el in enumerate(self._comp_info) if el['model'] == model_name)
-        comp_data = self._comp_info[idx]['comparison']
         dict_var_info = defaultdict(list)
         for iv, v in enumerate(comp_data['variables']):
             dict_var_info[v].append({'group': comp_data['var_groups'][iv],
@@ -2300,7 +2301,7 @@ def _funnel_plot(self, model_name, browser=None):
             (1 + max(0, max(comp_data['var_groups']) - max_plot_per100) / max_plot_per100)
         err_plot_height = 0.18 * 100 / height
         # Populate the plot template.
-        with open(self._PLOT_TEMPLATE, 'r') as f:
+        with open(plot_template, 'r') as f:
             template = f.read()
         content = re.sub(r'\$PAGE_TITLE', plot_title, template)
         content = re.sub(r'\$TITLE', plot_title, content)
@@ -2308,10 +2309,15 @@ def _funnel_plot(self, model_name, browser=None):
         content = re.sub(r'\$HEIGHT', '{}%'.format(height), content)
         content = re.sub(r'\$ERR_PLOT_HEIGHT', str(err_plot_height), content)
         # Launch the local server.
+        Tester._run_web_server(content, list_files)
+
+    @staticmethod
+    def _run_web_server(content, list_files):
+
         server = pyfunnel.MyHTTPServer(('', 0), pyfunnel.CORSRequestHandler,
                                        str_html=content, url_html='funnel')
         # Start the browser instance.
-        server.browse(list_files, browser=browser)
+        server.browse(list_files, timeout=0, browser=None)
 
     def _legacy_plot(self, y_sim, t_ref, y_ref, noOldResults, timOfMaxErr, model_name):
         """Plot comparison results generated by legacy comparison algorithm."""
diff --git a/requirements.txt b/requirements.txt
index 1f3b570d..b62aec0d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -7,7 +7,7 @@ gitpython>=3.1.33; python_version>='3.8'
 pytidylib==0.3.2
 simplejson==3.16.0
 six==1.14.0
-pyfunnel==1.0.2
+pyfunnel==1.0.3
 PyYAML==6.0.1
 cerberus==1.3.4
 
diff --git a/setup.py b/setup.py
index e27ba806..871d0d43 100644
--- a/setup.py
+++ b/setup.py
@@ -41,7 +41,7 @@
         'pytidylib>=0.3.2',
         'simplejson>=3.16',
         'six>=1.14',
-        'pyfunnel>=1.0.2',
+        'pyfunnel>=1.0.3',
         'PyYAML>=6.0.1',
         'cerberus>=1.3.4',
     ],