diff --git a/Project.toml b/Project.toml
index 6e251a4e..1a8c2d8c 100644
--- a/Project.toml
+++ b/Project.toml
@@ -3,7 +3,7 @@ uuid = "c9ce4bd3-c3d5-55b8-8973-c0e20141b8c3"
 keywords = ["GDAL", "IO"]
 license = "MIT"
 desc = "A high level API for GDAL - Geospatial Data Abstraction Library"
-version = "0.9.0"
+version = "0.9.1"
 
 [deps]
 CEnum = "fa961155-64e5-5f13-b03f-caf6b980ea82"
@@ -23,7 +23,7 @@ CEnum = "0.4"
 ColorTypes = "0.10, 0.11"
 DiskArrays = "0.3"
 Extents = "0.1"
-GDAL = "1.3"
+GDAL = "~1.3"
 GeoFormatTypes = "0.3, 0.4"
 GeoInterface = "1"
 GeoInterfaceRecipes = "1.0"
diff --git a/src/geointerface.jl b/src/geointerface.jl
index 3ba4b361..950e1a89 100644
--- a/src/geointerface.jl
+++ b/src/geointerface.jl
@@ -60,7 +60,7 @@ let pointtypes = (wkbPoint, wkbPoint25D, wkbPointM, wkbPointZM),
     end
     GeoInterface.geometry(feat::AbstractFeature) = getgeom(feat, 0)
 
-    GeoInterface.isgeometry(geom::AbstractGeometry) = true
+    GeoInterface.isgeometry(::Type{<:AbstractGeometry}) = true
     @enable_geo_plots AbstractGeometry
 
     function GeoInterface.geomtrait(geom::AbstractGeometry)
diff --git a/test/test_geometry.jl b/test/test_geometry.jl
index 2b2a14cd..8676190e 100644
--- a/test/test_geometry.jl
+++ b/test/test_geometry.jl
@@ -8,6 +8,7 @@ import GeoFormatTypes as GFT
         AG.createpoint(100, 70) do point
             @test GI.testgeometry(point)
         end
+        @test GI.isgeometry(AG.IGeometry)
     end
 
     @testset "Create a Point" begin