diff --git a/asar_xarray/asar.py b/asar_xarray/asar.py
index aa6f3f8..0bc1bb5 100644
--- a/asar_xarray/asar.py
+++ b/asar_xarray/asar.py
@@ -12,6 +12,7 @@
 from xarray.core.types import ReadBuffer
 from asar_xarray import reader, utils, envisat_direct
 from loguru import logger
+from numpy.typing import NDArray
 
 from asar_xarray.derived_subdatasets_metadata import process_derived_subdatasets_metadata
 from asar_xarray.general_metadata import process_general_metadata
@@ -36,7 +37,7 @@ def get_metadata(gdal_dataset: gdal.Dataset) -> Dict[str, Any]:
 
 
 def open_asar_dataset(filename_or_obj: str | os.PathLike[Any] | ReadBuffer[
-        Any] | bytes | memoryview | AbstractDataStore,
+    Any] | bytes | memoryview | AbstractDataStore,
                       polarization: str | None = None) -> xr.Dataset:
     """
     Open an ASAR dataset and converts it into an xarray Dataset.
@@ -296,7 +297,7 @@ def compute_azimuth_time(
         product_first_line_utc_time: np.datetime64,
         product_last_line_utc_time: np.datetime64,
         number_of_lines: int
-) -> np.ndarray:
+) -> NDArray[Any]:
     """
     Compute an array of azimuth times for each line in the ASAR product.
 
diff --git a/asar_xarray/envisat_direct.py b/asar_xarray/envisat_direct.py
index 8db8cf3..69ef382 100644
--- a/asar_xarray/envisat_direct.py
+++ b/asar_xarray/envisat_direct.py
@@ -5,6 +5,7 @@
 import math
 import pathlib
 import numpy as np
+from numpy.typing import NDArray
 
 
 def parse_int(s: str) -> int:
@@ -113,7 +114,7 @@ def parse_direct(path: str, gdal_metadata: dict[str, Any], polarization: str) ->
 
     # antenna gain
     n_samp = gdal_metadata["line_length"]
-    spreading_loss: np.ndarray[Any] = np.array([])
+    spreading_loss: NDArray[Any] = np.array([])
     if gdal_metadata["sample_type"] == "DETECTED":
         gain_arr = np.ones(n_samp)
         spreading_loss = np.ones(n_samp)
diff --git a/environment.yml b/environment.yml
index c6137f8..3ba687d 100644
--- a/environment.yml
+++ b/environment.yml
@@ -3,19 +3,19 @@ channels:
   - conda-forge
 dependencies:
   - python>=3.12
-  - gdal>=3.10
+  - gdal>=3.5.0
   - libgdal>=3.10
-  - numpy>=2.2.0
+  - numpy<2.0
   - xarray>=2025.1.0
   - pip
   - requests>=2.32.0
   - boto3>=1.37.0
-  - boto3-stubs>=1.37.0
+  - boto3-stubs>=1.37.0 # type hints
   - lxml>=5.3.0
   - mypy>=1.15.0
   - loguru>=0.7.0
-  - pandas-stubs >=2.0.0
+  - pandas-stubs >=2.0.0 # type hints
+  - rasterio>=1.4.0
+  - rioxarray>=0.19.0
   - pip:
-    - pytest-stub>=1.1.0
-    - rasterio>=1.4.0
-    - rioxarray>=0.19.0
+    - pytest-stub>=1.1.0 # type hints