diff --git a/.github/workflows/testing.yml b/.github/workflows/testing.yml
index 89a7a6b..2734f0f 100644
--- a/.github/workflows/testing.yml
+++ b/.github/workflows/testing.yml
@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ['3.10']
+        python-version: ['3.11']
     steps:
       - uses: actions/checkout@v2
       - name: Set up Python ${{ matrix.python-version }}
diff --git a/pyproject.toml b/pyproject.toml
index 420e086..21d0e97 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -8,16 +8,18 @@ version = "0.10.2"
 description = "Analysis software for the Lyte probe, a digital penetrometer for studying snow"
 keywords = ["snow penetrometer", "smart probe", "digital penetrometer", 'lyte probe', "avalanches", "snow densiy"]
 readme = "README.rst"
-requires-python = ">=3.8"
+requires-python = ">=3.9"
 classifiers = [
     'Development Status :: 2 - Pre-Alpha',
     'Intended Audience :: Developers',
     'Natural Language :: English',
-    'Programming Language :: Python :: 3.8',
     'Programming Language :: Python :: 3.9',
-    'Programming Language :: Python :: 3.10'
+    'Programming Language :: Python :: 3.10',
+    'Programming Language :: Python :: 3.11',
+    'Programming Language :: Python :: 3.12',
+
 ]
-dependencies = [ "pandas > 2.0.0", "pandas < 3.0.0"]
+dependencies = [ "numpy > 2.0.0", "pandas > 2.0.0", "pandas < 3.0.0"]
 
 [project.optional-dependencies]
 dev = [
diff --git a/study_lyte/profile.py b/study_lyte/profile.py
index 60a3e4f..17996dd 100644
--- a/study_lyte/profile.py
+++ b/study_lyte/profile.py
@@ -4,7 +4,7 @@
 from pathlib import Path
 from types import SimpleNamespace
 import numpy as np
-
+from functools import cached_property
 from . io import read_data, find_metadata
 from .adjustments import get_neutral_bias_at_border, remove_ambient, apply_calibration, get_points_from_fraction, zfilter
 from .detect import get_acceleration_start, get_acceleration_stop, get_nir_surface, get_nir_stop, get_sensor_start, get_ground_strike
@@ -151,6 +151,11 @@ def metadata(self):
 
         return self._meta
 
+    @cached_property
+    def end(self):
+        """End of the data used for analysis, prefer ground if detected"""
+        return self.stop.index if self.ground.index is None else self.ground.index
+
     @property
     def nir(self):
         """
@@ -159,9 +164,8 @@ def nir(self):
         if self._nir is None:
             self._nir = self.raw[["Sensor2", "Sensor3", "nir"]]
             self._nir['depth'] = self.depth.values
-            end = self.stop.index if self.ground.index is None else self.ground.index
-            if self.surface.nir.index < end:
-                self._nir = self._nir.iloc[self.surface.nir.index:end].reset_index()
+            if self.surface.nir.index < self.end:
+                self._nir = self._nir.iloc[self.surface.nir.index:self.end].reset_index()
                 self._nir = self._nir.drop(columns='index')
                 self._nir['depth'] = self._nir['depth'] - self._nir['depth'].iloc[0]
             else:
@@ -182,9 +186,7 @@ def force(self):
                     force = force - np.nanmean(force[0:20])
 
             self._force = pd.DataFrame({'force': force, 'depth': self.depth.values})
-            # prefer a ground index if available
-            end = self.stop.index if self.ground.index is None else self.ground.index
-            self._force = self._force.iloc[self.surface.force.index:end].reset_index()
+            self._force = self._force.iloc[self.surface.force.index:self.end].reset_index()
             self._force = self._force.drop(columns='index')
             if not self._force.empty:
                 self._force['depth'] = self._force['depth'] - self._force['depth'].iloc[0]
@@ -486,7 +488,7 @@ def surface(self):
         """
         if self._surface is None:
             # Call to populate nir in raw
-            idx = get_nir_surface(self.raw['Sensor3'])
+            idx = get_nir_surface(self.raw['nir'])
             if idx == 0:
                 LOG.warning("Unable to find snow surface, defaulting to first data point")
             # Event according the NIR sensors
@@ -496,6 +498,7 @@ def surface(self):
             # Event according to the force sensor
             force_surface_depth = depth + self.surface_detection_offset
             f_idx = abs(self.depth - force_surface_depth).argmin()
+
             # Retrieve force estimated start
             f_start = get_sensor_start(self.raw['Sensor1'], max_threshold=0.02, threshold=-0.02)
             f_start = f_start or f_idx
diff --git a/tests/test_adjustments.py b/tests/test_adjustments.py
index 41752b7..9eab334 100644
--- a/tests/test_adjustments.py
+++ b/tests/test_adjustments.py
@@ -83,6 +83,7 @@ def poly_function(elapsed, amplitude=4096, frequency=1):
 
 
 @pytest.mark.parametrize('data1_hz, data2_hz, desired_hz', [
+    # Typical usage
     (75, 100, 16000),
     (100, 75, 100),
 
@@ -108,8 +109,10 @@ def test_merge_on_to_time(data1_hz, data2_hz, desired_hz):
     # Check timing on both dataframes
     assert df1['data1'].idxmax() == pytest.approx(final['data1'].idxmax(), abs=3e-2)
     assert df1['data1'].idxmin() == pytest.approx(final['data1'].idxmin(), abs=3e-2)
+
     # Confirm the handling of multiple datasets
     assert len(final.columns) == 2
+
     # Confirm an exact match of length of data
     assert len(final['data1'][~np.isnan(final['data1'])]) == len(desired)
 
diff --git a/tests/test_profile.py b/tests/test_profile.py
index a72190b..0e5e38d 100644
--- a/tests/test_profile.py
+++ b/tests/test_profile.py
@@ -29,7 +29,7 @@ def test_stop_property(self, profile, filename, depth_method, expected):
 
 
     @pytest.mark.parametrize('filename, depth_method, expected', [
-        ('kaslo.csv', 'fused', 11641)
+        ('kaslo.csv', 'fused', 12565)
     ])
     def test_nir_surface_property(self, profile, filename, depth_method, expected):
         nir_surface = profile.surface.nir.index