diff --git a/dvrwarp/dvrwarp.py b/dvrwarp/dvrwarp.py
index b14e836..a6dfb1f 100644
--- a/dvrwarp/dvrwarp.py
+++ b/dvrwarp/dvrwarp.py
@@ -36,6 +36,7 @@ def main():
     
     pdal_args += [
         "reprojection",
+        "--readers.las.fix_dims=false", # don't mess with "Pulse width"
         "--readers.las.override_srs=EPSG:25832",
         "--filters.reprojection.in_srs=EPSG:25832",
         "--filters.reprojection.out_srs=EPSG:7416",
diff --git a/environment.yml b/environment.yml
index 1704f52..bd6e1c3 100644
--- a/environment.yml
+++ b/environment.yml
@@ -2,7 +2,7 @@ name: dvrwarp-dev
 channels:
   - conda-forge
 dependencies:
-  - pdal=2.1
+  - pdal>=2.5
   # for testing and preparing test data:
   - gdal
   - laspy>=2.0