diff --git a/modules/performRegionalEventSimulation/regionalGroundMotion/ComputeIntensityMeasure.py b/modules/performRegionalEventSimulation/regionalGroundMotion/ComputeIntensityMeasure.py
index f0bcd3460..46398343a 100644
--- a/modules/performRegionalEventSimulation/regionalGroundMotion/ComputeIntensityMeasure.py
+++ b/modules/performRegionalEventSimulation/regionalGroundMotion/ComputeIntensityMeasure.py
@@ -111,7 +111,8 @@
 
 if 'stampede2' not in socket.gethostname():
     from FetchOpenQuake import get_site_rup_info_oq
-    from FetchOpenSHA import *  # noqa: F403
+    #from FetchOpenSHA import *  # noqa: F403
+    from FetchOpenSHA_25_4_1 import *  # noqa: F403
 import threading  # noqa: E402
 
 import ujson  # noqa: E402
diff --git a/modules/performRegionalEventSimulation/regionalGroundMotion/CreateScenario.py b/modules/performRegionalEventSimulation/regionalGroundMotion/CreateScenario.py
index 1b7e3a0a0..87545592e 100644
--- a/modules/performRegionalEventSimulation/regionalGroundMotion/CreateScenario.py
+++ b/modules/performRegionalEventSimulation/regionalGroundMotion/CreateScenario.py
@@ -48,7 +48,8 @@
 import pandas as pd
 
 if 'stampede2' not in socket.gethostname():
-    from FetchOpenSHA import *  # noqa: F403
+    #from FetchOpenSHA import *  # noqa: F403
+    from FetchOpenSHA_25_4_1 import *  # noqa: F403
 
 
 def get_rups_to_run(scenario_info, user_scenarios, num_scenarios):  # noqa: C901, D103
diff --git a/modules/performRegionalEventSimulation/regionalGroundMotion/CreateStation.py b/modules/performRegionalEventSimulation/regionalGroundMotion/CreateStation.py
index 46048c9bf..02d1f7b61 100644
--- a/modules/performRegionalEventSimulation/regionalGroundMotion/CreateStation.py
+++ b/modules/performRegionalEventSimulation/regionalGroundMotion/CreateStation.py
@@ -78,7 +78,8 @@ def __call__(self, *args, **kwargs):
 
 
 if 'stampede2' not in socket.gethostname():
-    from FetchOpenSHA import (
+    #from FetchOpenSHA import (
+    from FetchOpenSHA_25_4_1 import (
         get_site_vs30_from_opensha,
         get_site_z1pt0_from_opensha,
         get_site_z2pt5_from_opensha,
diff --git a/modules/performRegionalEventSimulation/regionalGroundMotion/FetchOpenSHA_25_4_1.py b/modules/performRegionalEventSimulation/regionalGroundMotion/FetchOpenSHA_25_4_1.py
index 271d3269e..813784da5 100644
--- a/modules/performRegionalEventSimulation/regionalGroundMotion/FetchOpenSHA_25_4_1.py
+++ b/modules/performRegionalEventSimulation/regionalGroundMotion/FetchOpenSHA_25_4_1.py
@@ -34,7 +34,8 @@
 from org.opensha.commons.data import *  # noqa: F403
 from org.opensha.commons.data.function import *  # noqa: F403
 from org.opensha.commons.data.siteData import *  # noqa: F403
-from org.opensha.commons.geo import *  # noqa: F403
+#from org.opensha.commons.geo import *  # noqa: F403
+from org.opensha.commons.geo import Location  # noqa: F403
 from org.opensha.commons.param import *  # noqa: F403
 from org.opensha.commons.param.constraint import *  # noqa: F403
 from org.opensha.commons.param.event import *  # noqa: F403
@@ -464,6 +465,7 @@ def get_PointSource_info_CY2014(source_info, siteList):  # noqa: N802, N803, D10
         'dip': float(source_info['AverageDip']),
         'width': 0.0,
         'zTop': sourceDepth,
+        'zHyp': sourceDepth,
         'aveRake': float(source_info['AverageRake']),
     }
     return site_rup_info, siteList
diff --git a/modules/performRegionalEventSimulation/regionalGroundMotion/HazardSimulation.py b/modules/performRegionalEventSimulation/regionalGroundMotion/HazardSimulation.py
index b98306223..a400da3a3 100644
--- a/modules/performRegionalEventSimulation/regionalGroundMotion/HazardSimulation.py
+++ b/modules/performRegionalEventSimulation/regionalGroundMotion/HazardSimulation.py
@@ -51,6 +51,8 @@
 
 R2D = True
 
+OPENSHA_JAR = 'opensha-all.jar' # version 25.4.1 (invoked in 04/2026)
+
 
 def site_job(hazard_info):  # noqa: C901, D103
     # Sites and stations
@@ -542,12 +544,14 @@ def hazard_job(hazard_info):  # noqa: C901, D103, PLR0915
 
         memory_total = psutil.virtual_memory().total / (1024.0**3)
         memory_request = int(memory_total * 0.75)
-        jpype.addClassPath('./lib/OpenSHA-1.5.2.jar')
+        #jpype.addClassPath('./lib/OpenSHA-1.5.2.jar') # not supported by opensha starting from 02/2026
+        jpype.addClassPath('./lib/{}'.format(OPENSHA_JAR))
         try:
             jpype.startJVM(f'-Xmx{memory_request}G', convertStrings=False)
         except:  # noqa: E722
             print(  # noqa: T201
-                f'StartJVM of ./lib/OpenSHA-1.5.2.jar with {memory_request} GB Memory fails. Try again after releasing some memory'
+                #f'StartJVM of ./lib/OpenSHA-1.5.2.jar with {memory_request} GB Memory fails. Try again after releasing some memory'
+                f'StartJVM of ./lib/{OPENSHA_JAR} with {memory_request} GB Memory fails. Try again after releasing some memory'
             )
     if oq_flag:
         # clear up old db.sqlite3 if any
diff --git a/modules/performRegionalEventSimulation/regionalGroundMotion/HazardSimulationEQ.py b/modules/performRegionalEventSimulation/regionalGroundMotion/HazardSimulationEQ.py
index bf0bc9436..eb3333e40 100644
--- a/modules/performRegionalEventSimulation/regionalGroundMotion/HazardSimulationEQ.py
+++ b/modules/performRegionalEventSimulation/regionalGroundMotion/HazardSimulationEQ.py
@@ -52,6 +52,7 @@
 
 R2D = True
 
+OPENSHA_JAR = 'opensha-all.jar' # version 25.4.1 (invoked in 04/2026)
 
 def hazard_job(hazard_info):  # noqa: C901, D103, PLR0915
     from CreateScenario import load_ruptures_openquake
@@ -578,7 +579,8 @@ def hazard_job(hazard_info):  # noqa: C901, D103, PLR0915
 
             memory_total = psutil.virtual_memory().total / (1024.0**3)
             memory_request = int(memory_total * 0.75)
-            jpype.addClassPath('./lib/OpenSHA-1.5.2.jar')
+            #jpype.addClassPath('./lib/OpenSHA-1.5.2.jar') # not supported by opensha starting from 02/2026
+            jpype.addClassPath('./lib/{}'.format(OPENSHA_JAR))
             jpype.startJVM(f'-Xmx{memory_request}G', convertStrings=False)
     if oq_flag:
         # clear up old db.sqlite3 if any
diff --git a/modules/performRegionalEventSimulation/regionalGroundMotion/ScenarioForecast.py b/modules/performRegionalEventSimulation/regionalGroundMotion/ScenarioForecast.py
index 39e20ad58..46207bfc0 100644
--- a/modules/performRegionalEventSimulation/regionalGroundMotion/ScenarioForecast.py
+++ b/modules/performRegionalEventSimulation/regionalGroundMotion/ScenarioForecast.py
@@ -47,6 +47,8 @@
 
 import psutil
 
+OPENSHA_JAR = 'opensha-all.jar' # version 25.4.1 (invoked in 04/2026)
+
 if __name__ == '__main__':
     # parse arguments
     parser = argparse.ArgumentParser()
@@ -112,7 +114,8 @@
 
             memory_total = psutil.virtual_memory().total / (1024.0**3)
             memory_request = int(memory_total * 0.75)
-            jpype.addClassPath('./lib/OpenSHA-1.5.2.jar')
+            #jpype.addClassPath('./lib/OpenSHA-1.5.2.jar') # not supported by opensha starting from 02/2026
+            jpype.addClassPath('./lib/{}'.format(OPENSHA_JAR))
             jpype.startJVM(f'-Xmx{memory_request}G', convertStrings=False)
     from CreateScenario import (
         create_earthquake_scenarios,