diff --git a/geo/Calculation_gdal.py b/geo/Calculation_gdal.py
index 1b88b7d..687616d 100644
--- a/geo/Calculation_gdal.py
+++ b/geo/Calculation_gdal.py
@@ -4,6 +4,8 @@
     from osgeo import gdal  # noqa
 except ImportError:
     import gdal  # noqa
+except ImportError:
+    raise ImportError("Package `gdal` is required to run this function. Install it with `pip install gdal`.")
 
 
 def raster_value(path: str) -> dict:
diff --git a/requirements.txt b/requirements.txt
index 120599a..b6877eb 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,5 @@
 pygments
 requests
 seaborn
-gdal
 matplotlib
-xmltodict
\ No newline at end of file
+xmltodic
\ No newline at end of file