diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 77487a29..16ade19d 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -15,7 +15,7 @@ jobs:
       fail-fast: false
       matrix:
         version:
-          - '1.6'
+          - '1.10'
           - '1'
         os:
           - ubuntu-latest
diff --git a/Project.toml b/Project.toml
index 459f5b57..84eca27d 100644
--- a/Project.toml
+++ b/Project.toml
@@ -6,13 +6,18 @@ version = "0.5.9"
 [deps]
 EarCut_jll = "5ae413db-bbd1-5e63-b57d-d24a61df00f5"
 Extents = "411431e0-e8b7-467b-b5e0-f676ba4f2910"
-GeoInterface = "cf35fbd7-0cd7-5166-be24-54bfbe79505f"
 IterTools = "c8e1da08-722c-5040-9ed9-7db0dc04731e"
 LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"
 PrecompileTools = "aea7be01-6a6a-4083-8856-8a6e6704d82a"
 Random = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"
 StaticArrays = "90137ffa-7385-5640-81b9-e52037218182"
 
+[weakdeps]
+GeoInterface = "cf35fbd7-0cd7-5166-be24-54bfbe79505f"
+
+[extensions]
+GeometryBasicsGeoInterfaceExt = "GeoInterface"
+
 [compat]
 Aqua = "0.8"
 EarCut_jll = "2"
@@ -26,14 +31,15 @@ PrecompileTools = "1.0"
 Random = "<0.0.1,1"
 StaticArrays = "0.6, 1"
 Test = "<0.0.1,1"
-julia = "1.6"
+julia = "1.10"
 
 [extras]
 Aqua = "4c88cf16-eb10-579e-8560-4a9242c79595"
 GeoJSON = "61d90e0f-e114-555e-ac52-39dfb47a3ef9"
+GeoInterface = "cf35fbd7-0cd7-5166-be24-54bfbe79505f"
 OffsetArrays = "6fe1bfb0-de20-5000-8ca7-80f57d26f881"
 Random = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
 
 [targets]
-test = ["Aqua", "GeoJSON", "Test", "Random", "OffsetArrays"]
+test = ["Aqua", "GeoInterface", "GeoJSON", "OffsetArrays", "Random", "Test"]
diff --git a/src/geointerface.jl b/ext/GeometryBasicsGeoInterfaceExt.jl
similarity index 97%
rename from src/geointerface.jl
rename to ext/GeometryBasicsGeoInterfaceExt.jl
index f806fc27..ed5da70b 100644
--- a/src/geointerface.jl
+++ b/ext/GeometryBasicsGeoInterfaceExt.jl
@@ -1,3 +1,10 @@
+module GeometryBasicsGeoInterfaceExt
+
+using GeoInterface, GeometryBasics
+
+import GeometryBasics: geointerface_geomtype
+using GeometryBasics: Ngon
+
 # Implementation of trait based interface from https://github.com/JuliaGeo/GeoInterface.jl/
 
 GeoInterface.isgeometry(::Type{<:AbstractGeometry}) = true
@@ -104,12 +111,6 @@ function GeoInterface.convert(::Type{Point}, type::PointTrait, geom)
         return Point{2,T}(x, y)
     end
 end
-
-# without a function barrier you get a lot of allocations from runtime types
-function _collect_with_type(::Type{PT}, geom) where {PT <: Point{2}}
-    return [PT(GeoInterface.x(p), GeoInterface.y(p)) for p in getgeom(geom)]
-end
-
 function GeoInterface.convert(::Type{LineString}, type::LineStringTrait, geom)
     g1 = getgeom(geom, 1)
     x, y = GeoInterface.x(g1), GeoInterface.y(g1)
@@ -122,7 +123,6 @@ function GeoInterface.convert(::Type{LineString}, type::LineStringTrait, geom)
         return LineString(_collect_with_type(Point{2, T}, geom))
     end
 end
-
 function GeoInterface.convert(::Type{Polygon}, type::PolygonTrait, geom)
     t = LineStringTrait()
     exterior = GeoInterface.convert(LineString, t, GeoInterface.getexterior(geom))
@@ -133,7 +133,6 @@ function GeoInterface.convert(::Type{Polygon}, type::PolygonTrait, geom)
         return Polygon(exterior, interiors)
     end
 end
-
 function GeoInterface.convert(::Type{MultiPoint}, type::MultiPointTrait, geom)
     g1 = getgeom(geom, 1)
     x, y = GeoInterface.x(g1), GeoInterface.y(g1)
@@ -146,18 +145,18 @@ function GeoInterface.convert(::Type{MultiPoint}, type::MultiPointTrait, geom)
         return MultiPoint([Point{2,T}(GeoInterface.x(p), GeoInterface.y(p)) for p in getgeom(geom)])
     end
 end
-
 function GeoInterface.convert(::Type{MultiLineString}, type::MultiLineStringTrait, geom)
     t = LineStringTrait()
     return MultiLineString(map(l -> GeoInterface.convert(LineString, t, l), getgeom(geom)))
 end
-
 function GeoInterface.convert(::Type{MultiPolygon}, type::MultiPolygonTrait, geom)
     t = PolygonTrait()
     return MultiPolygon(map(poly -> GeoInterface.convert(Polygon, t, poly), getgeom(geom)))
 end
 
-function Extents.extent(rect::Rect2)
-    (xmin, ymin), (xmax, ymax) = extrema(rect)
-    return Extents.Extent(X=(xmin, xmax), Y=(ymin, ymax))
-end
\ No newline at end of file
+# without a function barrier you get a lot of allocations from runtime types
+function _collect_with_type(::Type{PT}, geom) where {PT <: Point{2}}
+    return [PT(GeoInterface.x(p), GeoInterface.y(p)) for p in getgeom(geom)]
+end
+
+end
diff --git a/src/GeometryBasics.jl b/src/GeometryBasics.jl
index 887e691c..d01865ae 100644
--- a/src/GeometryBasics.jl
+++ b/src/GeometryBasics.jl
@@ -1,7 +1,6 @@
 module GeometryBasics
 
 using IterTools, LinearAlgebra, StaticArrays
-using GeoInterface
 import Extents
 using EarCut_jll
 import Base: *
@@ -27,8 +26,6 @@ include("triangulation.jl")
 include("lines.jl")
 include("boundingboxes.jl")
 
-include("geointerface.jl")
-
 export AbstractGeometry, GeometryPrimitive
 export Mat, Point, Vec
 export LineFace, Polytope, Line, NgonFace, convert_simplex
@@ -71,4 +68,8 @@ if Base.VERSION >= v"1.8"
     include("precompiles.jl")
 end
 
+# Needed for GeometryBasicsGeoInterfaceExt. 
+# In future this can go away as can use Module dispatch.
+function geointerface_geomtype end
+
 end # module
diff --git a/src/primitives/rectangles.jl b/src/primitives/rectangles.jl
index fa51a216..912161a4 100644
--- a/src/primitives/rectangles.jl
+++ b/src/primitives/rectangles.jl
@@ -582,3 +582,12 @@ function faces(::Rect3)
         (3, 4, 8, 7), (1, 3, 7, 5), (6, 8, 4, 2)
     ]
 end
+
+function Extents.extent(rect::Rect2)
+    (xmin, ymin), (xmax, ymax) = extrema(rect)
+    return Extents.Extent(X=(xmin, xmax), Y=(ymin, ymax))
+end
+function Extents.extent(rect::Rect3)
+    (xmin, ymin, zmin), (xmax, ymax, zmax) = extrema(rect)
+    return Extents.Extent(X=(xmin, xmax), Y=(ymin, ymax), Z=(zmin, zmax))
+end
diff --git a/test/geointerface.jl b/test/geointerface.jl
index 31c7de38..1c62aee7 100644
--- a/test/geointerface.jl
+++ b/test/geointerface.jl
@@ -123,4 +123,9 @@ end
     ext = extent(rect)
     @test ext.X == (0.0f0, 1.0f0)
     @test ext.Y == (0.0f0, 1.0f0)
-end
\ No newline at end of file
+    rect = Rect3f(Vec3f(0), Vec3f(1.0))
+    ext = extent(rect)
+    @test ext.X == (0.0f0, 1.0f0)
+    @test ext.Y == (0.0f0, 1.0f0)
+    @test ext.Z == (0.0f0, 1.0f0)
+end