diff --git a/Multi-raster.ipynb b/Multi-raster.ipynb
new file mode 100644
index 0000000..e69de29
diff --git a/pyproject.toml b/pyproject.toml
index 57bf20c..2f4dfbf 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "rasters"
-version = "1.5.2"
+version = "1.5.3"
 description = "raster processing toolkit"
 readme = "README.md"
 authors = [
diff --git a/rasters/raster.py b/rasters/raster.py
index a3d7115..4629cbf 100644
--- a/rasters/raster.py
+++ b/rasters/raster.py
@@ -1325,8 +1325,12 @@ def to_file(
         if exists(filename) and not overwrite:
             raise IOError(f"output file already exists: {filename}")
 
-        with rasterio.open(filename, "w", **profile) as file:
-            file.write(output_array, 1)
+        if len(self.shape) == 2:
+            with rasterio.open(filename, "w", **profile) as file:
+                file.write(output_array, 1)
+        else:
+            with rasterio.open(filename, "w", **profile) as file:
+                file.write(output_array)
 
     def to_geotiff(
             self,
diff --git a/rasters/version.txt b/rasters/version.txt
index 4cda8f1..8af85be 100644
--- a/rasters/version.txt
+++ b/rasters/version.txt
@@ -1 +1 @@
-1.5.2
+1.5.3