diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c2c07fa..41d0076 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -20,7 +20,8 @@ jobs:
           - {name: Windows, python: '3.10', os: windows-latest}
           - {name: Mac, python: '3.10', os: macos-latest}
           - {name: 'Ubuntu', python: '3.10', os: ubuntu-latest}
-          - {name: '3.11', python: '3.11.0-rc.2 - 3.11', os: ubuntu-latest}
+          - {name: '3.12', python: '3.12', os: ubuntu-latest}
+          - {name: '3.11', python: '3.11', os: ubuntu-latest}
           - {name: '3.9', python: '3.9', os: ubuntu-latest}
           - {name: '3.8', python: '3.8', os: ubuntu-latest}
 
diff --git a/color_operations/colorspace.pyx b/color_operations/colorspace.pyx
index 3130c26..b101238 100644
--- a/color_operations/colorspace.pyx
+++ b/color_operations/colorspace.pyx
@@ -65,7 +65,7 @@ cdef enum:
 cpdef convert(double one, double two, double three, src, dst):
     cdef color color
 
-    if src not in ColorSpace or dst not in ColorSpace:
+    if ColorSpace(src) not in ColorSpace or ColorSpace(dst) not in ColorSpace:
         raise ValueError("Invalid colorspace")
 
     color = _convert(one, two, three, int(src), int(dst))
diff --git a/pyproject.toml b/pyproject.toml
index 23a1d56..5008a7f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -2,7 +2,7 @@
 requires = [
   "setuptools",
   "wheel",
-  "cython==0.29.32",
+  "cython>=0.29.32",
   "oldest-supported-numpy",
 ]
 
diff --git a/tests/test_colorspace.py b/tests/test_colorspace.py
index bf9b65f..b5f8c29 100644
--- a/tests/test_colorspace.py
+++ b/tests/test_colorspace.py
@@ -203,13 +203,13 @@ def test_array_bad_colorspace():
 
 def test_bad_colorspace_string():
     """String colorspaces raise ValueError"""
-    with pytest.raises(TypeError):
+    with pytest.raises(ValueError):
         convert(0.1, 0.1, 0.1, src="FOO", dst="RGB")
 
 
 def test_bad_colorspace_invalid_int():
     """Invalid colorspace integers raise ValueError"""
-    with pytest.raises(TypeError):
+    with pytest.raises(ValueError):
         convert(0.1, 0.1, 0.1, src=999, dst=999)