diff --git a/CHANGES.md b/CHANGES.md
index 78f2564d..40cf3838 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -2,19 +2,45 @@
 # Unreleased
 
 * Enable dynamic definition of Asset **reader** in `MultiBaseReader` (https://github.com/cogeotiff/rio-tiler/pull/711/, https://github.com/cogeotiff/rio-tiler/pull/728)
+
 * Adding `default_assets` for MultiBaseReader and STACReader (author @mccarthyryanc, https://github.com/cogeotiff/rio-tiler/pull/722)
+
 * Adding `default_bands` for MultiBandReader (https://github.com/cogeotiff/rio-tiler/pull/722)
+
 * Adding support for the STAC `Projection` extension to derive the `bounds`, `crs`, `minzoom` and `maxzoom` properties  **breaking change**
+
 * Refactor internal function and base classes for the `minzoom/maxzoom` calculation **breaking change**
+
 * Adding `transform`, `height` and `width` attributes (outside init) for `SpatialMixin` class
+
 * Moved `_dst_geom_in_tms_crs` from Reader to `SpatialMixin` class **breaking change**
+
 * Removed use of rasterio's `is_tiled` method
+
 * Enable **Alternate** asset's HREF for STAC by using `RIO_TILER_STAC_ALTERNATE_KEY` environment variable
+
 * Adding support for GDAL VRT Connection string for STAC Assets
+
 * Improve type hint definition
+
 * make `ImageData.rescale` and `ImageData.apply_color_formula` to return `self`
+
 * add support for `.json` colormap files
 
+* do no `lowercase` colormap name in `ColorMaps.get` method **breaking change**
+
+    ```python
+    from rio_tiler.colormap import cmap
+
+    # before
+    assert cmap.get("Viridis")
+
+    # now
+    assert cmap.get("Viridis")
+    >> InvalidColorMapName: Invalid colormap name: Viridis
+    ```
+
+
 # 6.7.0 (2024-09-05)
 
 * raise `MissingCRS` or `InvalidGeographicBounds` errors when Xarray datasets have wrong geographic metadata
diff --git a/rio_tiler/colormap.py b/rio_tiler/colormap.py
index 04ec96f7..1f754e36 100644
--- a/rio_tiler/colormap.py
+++ b/rio_tiler/colormap.py
@@ -296,7 +296,7 @@ def get(self, name: str) -> ColorMapType:
             dict: colormap dictionary.
 
         """
-        cmap = self.data.get(name.lower(), None)
+        cmap = self.data.get(name, None)
         if cmap is None:
             raise InvalidColorMapName(f"Invalid colormap name: {name}")
 
@@ -308,7 +308,7 @@ def get(self, name: str) -> ColorMapType:
                 colormap = numpy.load(cmap)
                 assert colormap.shape == (256, 4)
                 assert colormap.dtype == numpy.uint8
-                return {idx: tuple(value) for idx, value in enumerate(colormap)}
+                cmap_data = {idx: tuple(value) for idx, value in enumerate(colormap)}
 
             elif cmap.suffix == ".json":
                 with cmap.open() as f:
@@ -326,9 +326,13 @@ def get(self, name: str) -> ColorMapType:
                         for (inter, v) in cmap_data
                     ]
 
-                return cmap_data
+            else:
+                raise ValueError(f"Not supported {cmap.suffix} extension for ColorMap")
 
-            raise ValueError(f"Not supported {cmap.suffix} extension for ColorMap")
+            # save the numpy array / dict / sequence in the data dict
+            # avoiding the need to re-load the data
+            self.data[name] = cmap_data
+            return cmap_data
 
         return cmap