diff --git a/rio_tiler/utils.py b/rio_tiler/utils.py
index 5c98fa1a..0b775c78 100644
--- a/rio_tiler/utils.py
+++ b/rio_tiler/utils.py
@@ -791,7 +791,7 @@ def cast_to_sequence(val: Optional[Any] = None) -> Sequence:
     return val
 
 
-def CRS_to_info(crs: pyproj.CRS) -> Optional[tuple[str, str, str]]:
+def CRS_to_info(crs: CRS) -> Optional[tuple[str, str, str]]:
     """Convert CRS to URI.
 
     Code adapted from https://github.com/developmentseed/morecantile/blob/1829fe12408e4a1feee7493308f3f02257ef4caf/morecantile/models.py#L148-L161
@@ -809,7 +809,7 @@ def CRS_to_info(crs: pyproj.CRS) -> Optional[tuple[str, str, str]]:
     return None
 
 
-def CRS_to_uri(crs: pyproj.CRS) -> Optional[str]:
+def CRS_to_uri(crs: CRS) -> Optional[str]:
     """Convert CRS to URI."""
     if authority_version_code := CRS_to_info(crs):
         authority, version, code = authority_version_code
@@ -817,7 +817,7 @@ def CRS_to_uri(crs: pyproj.CRS) -> Optional[str]:
     return None
 
 
-def CRS_to_urn(crs: pyproj.CRS) -> Optional[str]:
+def CRS_to_urn(crs: CRS) -> Optional[str]:
     """Convert CRS to URN."""
     if authority_version_code := CRS_to_info(crs):
         authority, version, code = authority_version_code