diff --git a/pyproject.toml b/pyproject.toml
index eaed25b..b64f60c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -17,11 +17,11 @@ authors = [
 ]
 dynamic = ["version"]
 
-requires-python = ">=3.9"
+requires-python = ">=3.10"
 dependencies = [
     "numpy",
-    "protozfits~=2.4",
-    "ctapipe~=0.20.0",
+    "protozfits~=2.6",
+    "ctapipe~=0.23.0",
 ]
 
 [project.optional-dependencies]
diff --git a/src/ctapipe_io_zfits/dl0.py b/src/ctapipe_io_zfits/dl0.py
index 639cafd..97ee745 100644
--- a/src/ctapipe_io_zfits/dl0.py
+++ b/src/ctapipe_io_zfits/dl0.py
@@ -102,12 +102,8 @@ def _fill_dl0_container(
     n_pixels_nominal = camera_geometry.n_pixels
 
     # fill not readout pixels with 0, reorder pixels, use 2d array when gain reduced
-    if n_channels == 2:
-        waveform = np.zeros((n_channels, n_pixels_nominal, n_samples), dtype=np.float32)
-        waveform[:, camera_config.pixel_id_map[pixel_stored]] = zfits_waveform
-    else:
-        waveform = np.zeros((n_pixels_nominal, n_samples), dtype=np.float32)
-        waveform[camera_config.pixel_id_map[pixel_stored]] = zfits_waveform[0]
+    waveform = np.zeros((n_channels, n_pixels_nominal, n_samples), dtype=np.float32)
+    waveform[:, camera_config.pixel_id_map[pixel_stored]] = zfits_waveform
 
     if ignore_samples_start != 0 or ignore_samples_end != 0:
         start = ignore_samples_start
diff --git a/src/ctapipe_io_zfits/tests/test_dl0.py b/src/ctapipe_io_zfits/tests/test_dl0.py
index ca3d984..e83c169 100644
--- a/src/ctapipe_io_zfits/tests/test_dl0.py
+++ b/src/ctapipe_io_zfits/tests/test_dl0.py
@@ -1,6 +1,5 @@
 import astropy.units as u
 import numpy as np
-import pytest
 from astropy.time import Time
 from ctapipe.core.tool import run_tool
 from ctapipe.instrument import SubarrayDescription
@@ -53,18 +52,17 @@ def test_subarray_events(dummy_dl0):
 def test_process(dummy_dl0, tmp_path):
     path = tmp_path / "dummy.dl1.h5"
 
-    with pytest.warns(UserWarning, match="Encountered an event with no R1 data"):
-        run_tool(
-            ProcessorTool(),
-            [
-                f"--input={dummy_dl0}",
-                f"--output={path}",
-                "--write-images",
-                "--write-parameters",
-                "--EventTypeFilter.allowed_types=SUBARRAY",
-            ],
-            raises=True,
-        )
+    run_tool(
+        ProcessorTool(),
+        [
+            f"--input={dummy_dl0}",
+            f"--output={path}",
+            "--write-images",
+            "--write-parameters",
+            "--EventTypeFilter.allowed_types=SUBARRAY",
+        ],
+        raises=True,
+    )
 
 
 def test_telescope_event_source(dummy_tel_file):
@@ -83,18 +81,17 @@ def test_telescope_event_source(dummy_tel_file):
 def test_process_tel_events(dummy_tel_file, tmp_path):
     path = tmp_path / "dummy.dl1.h5"
 
-    with pytest.warns(UserWarning, match="Encountered an event with no R1 data"):
-        run_tool(
-            ProcessorTool(),
-            [
-                f"--input={dummy_tel_file}",
-                f"--output={path}",
-                "--write-images",
-                "--write-parameters",
-                "--MultiFiles.all_chunks=True",
-            ],
-            raises=True,
-        )
+    run_tool(
+        ProcessorTool(),
+        [
+            f"--input={dummy_tel_file}",
+            f"--output={path}",
+            "--write-images",
+            "--write-parameters",
+            "--MultiFiles.all_chunks=True",
+        ],
+        raises=True,
+    )
 
     with TableLoader(path) as loader:
         events = loader.read_telescope_events()