diff --git a/CHANGES.txt b/CHANGES.txt
index e40dabd..bf7a6c8 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -1,3 +1,16 @@
+1.1.1 (2019-09-10)
+------------------
+
+- add safeguard to keep datatype from input to output files (#85)
+
+CLI Changes:
+- add `-t, --dtype` datatype option.
+
+API Changes:
+- add datatype option
+- update for rasterio>=1.0.28
+- allow rasterio.io.DatasetReader input (#89)
+
 1.1.0 (2019-07-16)
 ------------------
 
diff --git a/README.md b/README.md
index 5d5b5a9..f812c9a 100644
--- a/README.md
+++ b/README.md
@@ -65,6 +65,8 @@ $ rio cogeo create --help
     -p, --cog-profile [jpeg|webp|zstd|lzw|deflate|packbits|raw] CloudOptimized GeoTIFF profile (default: deflate).
     --nodata NUMBER|nan             Set nodata masking values for input dataset.
     --add-mask                      Force output dataset creation with an internal mask (convert alpha band or nodata to mask).
+    -t, --dtype [ubyte|uint8|uint16|int16|uint32|int32|float32|float64]
+                                    Output data type.
     --overview-level INTEGER        Overview level (if not provided, appropriate overview level will be selected
                                     until the smallest overview is smaller than the value of the internal blocksize)
     --overview-resampling [nearest|bilinear|cubic|cubic_spline|lanczos|average|mode|gauss] Overview creation resampling algorithm.
diff --git a/requirements.txt b/requirements.txt
index df1980e..2e8aae4 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,5 @@
 click
 numpy~=1.15
-rasterio>=1.0.9
+rasterio>=1.0.28
+supermercado
+mercantile
\ No newline at end of file
diff --git a/rio_cogeo/cogeo.py b/rio_cogeo/cogeo.py
index a41bf77..a560c58 100644
--- a/rio_cogeo/cogeo.py
+++ b/rio_cogeo/cogeo.py
@@ -10,7 +10,7 @@ from contextlib import contextmanager
 import click
 
 import rasterio
-from rasterio.io import MemoryFile
+from rasterio.io import DatasetReader, MemoryFile
 from rasterio.env import GDALVersion
 from rasterio.vrt import WarpedVRT
 from rasterio.warp import transform_bounds
@@ -20,7 +20,6 @@ from rasterio.transform import Affine
 
 import mercantile
 from supermercado.burntiles import tile_extrema
-
 from rio_cogeo.errors import LossyCompression, IncompatibleBlockRasterSize
 from rio_cogeo.utils import (
     get_maximum_overview_level,
@@ -52,11 +51,12 @@ def TemporaryRasterFile(dst_path, suffix=".tif"):
 
 
 def cog_translate(
-    src_path,
+    source,
     dst_path,
     dst_kwargs,
     indexes=None,
     nodata=None,
+    dtype=None,
     add_mask=None,
     overview_level=None,
     overview_resampling="nearest",
@@ -72,8 +72,9 @@ def cog_translate(
 
     Parameters
     ----------
-    src_path : str or PathLike object
-        A dataset path or URL. Will be opened in "r" mode.
+    source : str, PathLike object or rasterio.io.DatasetReader
+        A dataset path, URL or rasterio.io.DatasetReader object.
+        Will be opened in "r" mode.
     dst_path : str or Path-like object
         An output dataset path or or PathLike object.
         Will be opened in "w" mode.
@@ -83,6 +84,8 @@ def cog_translate(
         Raster band indexes to copy.
     nodata, int, optional
         Overwrite nodata masking values for input dataset.
+    dtype: str, optional
+        Overwrite output data type. Default will be the input data type.
     add_mask, bool, optional
         Force output dataset creation with a mask.
     overview_level : int, optional (default: 6)
@@ -106,10 +109,16 @@ def cog_translate(
     config = config or {}
 
     with rasterio.Env(**config):
-        with rasterio.open(src_path) as src_dst:
+        with ExitStack() as ctx:
+            if isinstance(source, DatasetReader):
+                src_dst = ctx.enter_context(source)
+            else:
+                src_dst = ctx.enter_context(rasterio.open(source))
+
             meta = src_dst.meta
             indexes = indexes if indexes else src_dst.indexes
             nodata = nodata if nodata is not None else src_dst.nodata
+            dtype = dtype if dtype else src_dst.dtypes[0]
             alpha = has_alpha_band(src_dst)
             mask = has_mask_band(src_dst)
 
@@ -147,7 +156,7 @@ def cog_translate(
                     dst_kwargs["blockxsize"] = tilesize
                     dst_kwargs["blockysize"] = tilesize
 
-            vrt_params = dict(add_alpha=True)
+            vrt_params = dict(add_alpha=True, dtype=dtype)
 
             if nodata is not None:
                 vrt_params.update(
@@ -204,62 +213,59 @@ def cog_translate(
                 if in_memory is None:
                     in_memory = vrt_dst.width * vrt_dst.height < IN_MEMORY_THRESHOLD
 
-                with ExitStack() as ctx:
-                    if in_memory:
-                        tmpfile = ctx.enter_context(MemoryFile())
-                        tmp_dst = ctx.enter_context(tmpfile.open(**meta))
-                    else:
-                        tmpfile = ctx.enter_context(TemporaryRasterFile(dst_path))
-                        tmp_dst = ctx.enter_context(
-                            rasterio.open(tmpfile.name, "w", **meta)
-                        )
+                if in_memory:
+                    tmpfile = ctx.enter_context(MemoryFile())
+                    tmp_dst = ctx.enter_context(tmpfile.open(**meta))
+                else:
+                    tmpfile = ctx.enter_context(TemporaryRasterFile(dst_path))
+                    tmp_dst = ctx.enter_context(
+                        rasterio.open(tmpfile.name, "w", **meta)
+                    )
 
-                    wind = list(tmp_dst.block_windows(1))
+                wind = list(tmp_dst.block_windows(1))
 
-                    if not quiet:
-                        click.echo("Reading input: {}".format(src_path), err=True)
-                    fout = os.devnull if quiet else sys.stderr
-                    with click.progressbar(
-                        wind, length=len(wind), file=fout, show_percent=True
-                    ) as windows:
-                        for ij, w in windows:
-                            matrix = vrt_dst.read(window=w, indexes=indexes)
-                            tmp_dst.write(matrix, window=w)
+                if not quiet:
+                    click.echo("Reading input: {}".format(source), err=True)
+                fout = os.devnull if quiet else sys.stderr
+                with click.progressbar(
+                    wind, length=len(wind), file=fout, show_percent=True
+                ) as windows:
+                    for ij, w in windows:
+                        matrix = vrt_dst.read(window=w, indexes=indexes)
+                        tmp_dst.write(matrix, window=w)
 
-                            if add_mask or mask:
-                                mask_value = vrt_dst.dataset_mask(window=w)
-                                tmp_dst.write_mask(mask_value, window=w)
+                        if add_mask or mask:
+                            mask_value = vrt_dst.dataset_mask(window=w)
+                            tmp_dst.write_mask(mask_value, window=w)
 
-                    if overview_level is None:
-                        overview_level = get_maximum_overview_level(vrt_dst, tilesize)
+                if overview_level is None:
+                    overview_level = get_maximum_overview_level(vrt_dst, tilesize)
 
-                    if not quiet and overview_level:
-                        click.echo("Adding overviews...", err=True)
+                if not quiet and overview_level:
+                    click.echo("Adding overviews...", err=True)
 
-                    overviews = [2 ** j for j in range(1, overview_level + 1)]
-                    tmp_dst.build_overviews(
-                        overviews, ResamplingEnums[overview_resampling]
-                    )
+                overviews = [2 ** j for j in range(1, overview_level + 1)]
+                tmp_dst.build_overviews(overviews, ResamplingEnums[overview_resampling])
 
-                    if not quiet:
-                        click.echo("Updating dataset tags...", err=True)
+                if not quiet:
+                    click.echo("Updating dataset tags...", err=True)
 
-                    for i, b in enumerate(indexes):
-                        tmp_dst.set_band_description(i + 1, src_dst.descriptions[b - 1])
+                for i, b in enumerate(indexes):
+                    tmp_dst.set_band_description(i + 1, src_dst.descriptions[b - 1])
 
-                    tags = src_dst.tags()
-                    tags.update(
-                        dict(
-                            OVR_RESAMPLING_ALG=ResamplingEnums[
-                                overview_resampling
-                            ].name.upper()
-                        )
+                tags = src_dst.tags()
+                tags.update(
+                    dict(
+                        OVR_RESAMPLING_ALG=ResamplingEnums[
+                            overview_resampling
+                        ].name.upper()
                     )
-                    tmp_dst.update_tags(**tags)
+                )
+                tmp_dst.update_tags(**tags)
 
-                    if not quiet:
-                        click.echo("Writing output to: {}".format(dst_path), err=True)
-                    copy(tmp_dst, dst_path, copy_src_overviews=True, **dst_kwargs)
+                if not quiet:
+                    click.echo("Writing output to: {}".format(dst_path), err=True)
+                copy(tmp_dst, dst_path, copy_src_overviews=True, **dst_kwargs)
 
 
 def cog_validate(src_path):
diff --git a/rio_cogeo/scripts/cli.py b/rio_cogeo/scripts/cli.py
index 7f73cbe..75c1034 100644
--- a/rio_cogeo/scripts/cli.py
+++ b/rio_cogeo/scripts/cli.py
@@ -84,6 +84,7 @@ def cogeo():
     help="Force output dataset creation with an internal mask (convert alpha "
     "band or nodata to mask).",
 )
+@options.dtype_opt
 @click.option(
     "--overview-level",
     type=int,
@@ -141,6 +142,7 @@ def create(
     bidx,
     cogeo_profile,
     nodata,
+    dtype,
     add_mask,
     overview_level,
     overview_resampling,
@@ -175,17 +177,18 @@ def create(
         input,
         output,
         output_profile,
-        bidx,
-        nodata,
-        add_mask,
-        overview_level,
-        overview_resampling,
-        web_optimized,
-        latitude_adjustment,
-        resampling,
-        in_memory,
-        config,
-        quiet,
+        indexes=bidx,
+        nodata=nodata,
+        dtype=dtype,
+        add_mask=add_mask,
+        overview_level=overview_level,
+        overview_resampling=overview_resampling,
+        web_optimized=web_optimized,
+        latitude_adjustment=latitude_adjustment,
+        resampling=resampling,
+        in_memory=in_memory,
+        config=config,
+        quiet=quiet,
     )
 
 
diff --git a/setup.py b/setup.py
index bd2f07d..944254d 100644
--- a/setup.py
+++ b/setup.py
@@ -9,7 +9,7 @@ with open("README.md") as f:
 # Runtime requirements.
 inst_reqs = [
     "click",
-    "rasterio[s3]>=1.0.1",
+    "rasterio[s3]>=1.0.28",
     "numpy~=1.15",
     "supermercado",
     "mercantile",
@@ -29,7 +29,7 @@ if sys.version_info >= (3, 6):
 
 setup(
     name="rio-cogeo",
-    version="1.1.0",
+    version="1.1.1",
     description=u"CloudOptimized GeoTIFF (COGEO) creation plugin for rasterio",
     long_description=readme,
     long_description_content_type="text/markdown",

diff --git a/tests/test_cli.py b/tests/test_cli.py
index 46c21df..3e1c987 100644
--- a/tests/test_cli.py
+++ b/tests/test_cli.py
@@ -46,9 +46,7 @@ def test_cogeo_valid():
             assert src.height == 512
             assert src.width == 512
             assert src.meta["dtype"] == "uint8"
-            assert (
-                not src.is_tiled
-            )  # Because blocksize is 512 and the file is 512, the output is not tiled
+            assert src.is_tiled
             assert src.compression.value == "DEFLATE"
             assert not src.photometric
             assert src.interleaving.value == "PIXEL"
@@ -204,9 +202,7 @@ def test_cogeo_validOvrOption():
         assert not result.exception
         assert result.exit_code == 0
         with rasterio.open("output.tif") as src:
-            assert (
-                not src.is_tiled
-            )  # Because blocksize is 512 and the file is 512, the output is not tiled
+            assert src.is_tiled
             assert src.overviews(1) == [2, 4]
 
 
diff --git a/tests/test_cogeo.py b/tests/test_cogeo.py
index 14d35d4..657cd53 100644
--- a/tests/test_cogeo.py
+++ b/tests/test_cogeo.py
@@ -292,3 +292,25 @@ def test_cog_translate_valid_blocksize():
                 assert not src.profile.get("blockxsize")
                 assert not src.profile.get("blockysize")
                 assert not src.overviews(1)
+
+
+def test_cog_translate_validDataset():
+    """Should work as expected (create cogeo from an open dataset)."""
+    runner = CliRunner()
+    with runner.isolated_filesystem():
+        with rasterio.open(raster_path_rgb) as src_dst:
+            cog_translate(src_dst, "cogeo.tif", jpeg_profile, quiet=True)
+
+        with rasterio.open("cogeo.tif") as src:
+            assert src.height == 512
+            assert src.width == 512
+            assert src.meta["dtype"] == "uint8"
+            assert src.is_tiled
+            assert src.profile["blockxsize"] == 64
+            assert src.profile["blockysize"] == 64
+            assert src.compression.value == "JPEG"
+            assert src.photometric.value == "YCbCr"
+            assert src.interleaving.value == "PIXEL"
+            assert src.overviews(1) == [2, 4, 8]
+            assert src.tags()["OVR_RESAMPLING_ALG"] == "NEAREST"
+            assert not has_mask_band(src)
diff --git a/tests/test_validate.py b/tests/test_validate.py
index 7014f5b..bde475b 100644
--- a/tests/test_validate.py
+++ b/tests/test_validate.py
@@ -62,6 +62,8 @@ def test_cog_validate_validCreatioValid(monkeypatch):
         )
         assert cog_validate("cogeo.tif")
 
+        # Change in rasterio 1.0.26
+        # https://github.com/mapbox/rasterio/blob/master/CHANGES.txt#L43
         config = dict(GDAL_TIFF_OVR_BLOCKSIZE="1024")
         cog_translate(
             raster_big,
@@ -71,4 +73,4 @@ def test_cog_validate_validCreatioValid(monkeypatch):
             config=config,
             quiet=True,
         )
-        assert not cog_validate("cogeo.tif")
+        assert cog_validate("cogeo.tif")

datatype option 
following #85, a fix has been pushed to rasterio so now we need to add an option or a default behaviour to rio-cogeo to handle datatype inheritance... 

ref https://github.com/mapbox/rasterio/pull/1768
tests/test_cli.py::test_cogeo_valid_external_mask tests/test_cli.py::test_cogeo_validbidx tests/test_cli.py::test_cogeo_invalidbidx tests/test_cli.py::test_cogeo_invalidbidxString tests/test_cli.py::test_cogeo_validnodata tests/test_cli.py::test_cogeo_validGdalOptions tests/test_cli.py::test_cogeo_validOvrOption tests/test_cli.py::test_cogeo_web tests/test_cli.py::test_cogeo_validgdalBlockOption tests/test_cli.py::test_cogeo_validNodataCustom tests/test_cli.py::test_cogeo_validTempFile tests/test_validate.py::test_cog_validate_valid