diff --git a/src/specklepy/objects/GIS/__init__.py b/src/specklepy/objects/GIS/__init__.py
index 58d7b33..5ac3dff 100644
--- a/src/specklepy/objects/GIS/__init__.py
+++ b/src/specklepy/objects/GIS/__init__.py
@@ -7,6 +7,7 @@
     GisPolygonElement,
     GisPolygonGeometry,
     GisRasterElement,
+    PolygonGeometry,
 )
 from specklepy.objects.GIS.layers import RasterLayer, VectorLayer
 
@@ -14,6 +15,7 @@
     "VectorLayer",
     "RasterLayer",
     "GisPolygonGeometry",
+    "PolygonGeometry",
     "GisPolygonElement",
     "GisLineElement",
     "GisPointElement",
diff --git a/src/specklepy/objects/GIS/geometry.py b/src/specklepy/objects/GIS/geometry.py
index 5cb78e1..68df54c 100644
--- a/src/specklepy/objects/GIS/geometry.py
+++ b/src/specklepy/objects/GIS/geometry.py
@@ -12,14 +12,14 @@
 )
 
 
-class GisPolygonGeometry(
-    Base, speckle_type="Objects.GIS.PolygonGeometry", detachable={"displayValue"}
-):
+class PolygonGeometry(Base, speckle_type="Objects.GIS.PolygonGeometry"):
     """GIS Polygon Geometry"""
 
-    boundary: Optional[Union[Polyline, Arc, Line, Circle, Polycurve]] = None
-    voids: Optional[List[Union[Polyline, Arc, Line, Circle, Polycurve]]] = None
-    displayValue: Optional[List[Mesh]] = None
+    boundary: Optional[Polyline]
+    voids: Optional[List[Polyline]]
+
+
+GisPolygonGeometry = PolygonGeometry
 
 
 class GisPolygonElement(Base, speckle_type="Objects.GIS.PolygonElement"):
diff --git a/src/specklepy/objects/other.py b/src/specklepy/objects/other.py
index 5a2576e..76a01e4 100644
--- a/src/specklepy/objects/other.py
+++ b/src/specklepy/objects/other.py
@@ -303,9 +303,19 @@ class RevitParameter(Base, speckle_type="Objects.BuiltElements.Revit.Parameter")
     isTypeParameter: bool = False
 
 
+@deprecated(version="2.20", reason="Namespace changed, collectionType deprecated")
 class Collection(
     Base, speckle_type="Speckle.Core.Models.Collection", detachable={"elements"}
 ):
     name: Optional[str] = None
     collectionType: Optional[str] = None
     elements: Optional[List[Base]] = None
+
+
+class Collection(  # noqa: F811
+    Base,
+    speckle_type="Speckle.Core.Models.Collections.Collection",
+    detachable={"elements"},
+):
+    name: Optional[str] = None
+    elements: Optional[List[Base]]