diff --git a/pyproject.toml b/pyproject.toml
index 4db678ad..08abb4ab 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -40,6 +40,8 @@ dependencies = [
     "pydantic-settings~=2.0",
     "pandas==1.5.3",
     "redis",
+    "fastapi>=0.100.0,<0.107.0",
+    "starlette<0.28",
 ]
 
 [project.optional-dependencies]
diff --git a/titiler/xarray/factory.py b/titiler/xarray/factory.py
index 95861f67..2ba9b46f 100644
--- a/titiler/xarray/factory.py
+++ b/titiler/xarray/factory.py
@@ -538,7 +538,7 @@ def map_viewer(
                         "request": request,
                         "tilejson_endpoint": tilejson_url,
                         "tms": tms,
-                        "resolutions": [tms._resolution(matrix) for matrix in tms],
+                        "resolutions": [matrix.cellSize for matrix in tms],
                     },
                     media_type="text/html",
                 )
diff --git a/titiler/xarray/reader.py b/titiler/xarray/reader.py
index 077a20e4..a42a2f8f 100644
--- a/titiler/xarray/reader.py
+++ b/titiler/xarray/reader.py
@@ -167,17 +167,17 @@ def get_variable(
         da = da.sel({dim_to_drop: dim_val}).drop(dim_to_drop)
     da = arrange_coordinates(da)
 
-    if (da.x > 180).any():
+    # Make sure we have a valid CRS
+    crs = da.rio.crs or "epsg:4326"
+    da.rio.write_crs(crs, inplace=True)
+
+    if crs == "epsg:4326" and (da.x > 180).any():
         # Adjust the longitude coordinates to the -180 to 180 range
         da = da.assign_coords(x=(da.x + 180) % 360 - 180)
 
         # Sort the dataset by the updated longitude coordinates
         da = da.sortby(da.x)
 
-    # Make sure we have a valid CRS
-    crs = da.rio.crs or "epsg:4326"
-    da.rio.write_crs(crs, inplace=True)
-
     if "time" in da.dims:
         if time_slice:
             time_as_str = time_slice.split("T")[0]