diff --git a/telluric/collections.py b/telluric/collections.py
index bfe1d77..7277a54 100644
--- a/telluric/collections.py
+++ b/telluric/collections.py
@@ -325,9 +325,11 @@ def save(self, filename, driver=None, schema=None):
             crs = self.crs
 
         # https://github.com/rasterio/rasterio/issues/2453
-        crs = crs.to_dict()
+        # https://github.com/rasterio/rasterio/issues/3282 (to_dict() is lossy in rasterio)
+        # We should switch to fiona 1.9.x and convert to fiona.crs.CRS
+        crs_wkt = crs.to_wkt()
 
-        with fiona.open(filename, 'w', driver=driver, schema=schema, crs=crs) as sink:
+        with fiona.open(filename, 'w', driver=driver, schema=schema, crs_wkt=crs_wkt) as sink:
             for feature in self:
                 new_feature = self._adapt_feature_before_write(feature)
                 sink.write(new_feature.to_record(crs))
diff --git a/tests/test_collections.py b/tests/test_collections.py
index 8c862ca..daa3f9f 100644
--- a/tests/test_collections.py
+++ b/tests/test_collections.py
@@ -362,7 +362,7 @@ def test_feature_collection_with_dates_serializes_correctly():
     with tempfile.TemporaryDirectory() as path:
         file_path = os.path.join(path, "test_dates.shp")
         with fiona.open(
-            file_path, mode='w', driver="ESRI Shapefile", schema=schema, crs=feature.crs.to_dict()
+            file_path, mode='w', driver="ESRI Shapefile", schema=schema, crs_wkt=feature.crs.to_wkt()
         ) as sink:
             sink.write(mapping(feature))