diff --git a/accelerate/pyproject.toml b/accelerate/pyproject.toml
index ddc74ffa..1c3d6867 100644
--- a/accelerate/pyproject.toml
+++ b/accelerate/pyproject.toml
@@ -1,6 +1,7 @@
 [project]
 name="PyOpenGL-accelerate"
 dynamic=["version"]
+requires-python = ">= 3.9" # At least Python 3.9
 description = "Cython-coded accelerators for PyOpenGL"
 authors = [
     {name="Mike C. Fletcher",email="mcfletch@vrplumber.com"},
@@ -23,7 +24,6 @@ keywords = [
 classifiers = [
     "License :: OSI Approved :: BSD License",
     "Programming Language :: Python",
-    "Programming Language :: Python :: 2",
     "Programming Language :: Python :: 3",
     "Topic :: Multimedia :: Graphics :: 3D Rendering",
     "Topic :: Software Development :: Libraries :: Python Modules",
@@ -36,7 +36,7 @@ Source = "https://github.com/mcfletch/pyopengl"
 Documentation = "https://mcfletch.github.io/pyopengl/documentation/index.html"
 
 [build-system]
-requires = [ "setuptools >= 42.0", "Cython >= 0.28", "numpy" ]
+requires = [ "setuptools >= 42.0", "Cython >= 3", "numpy" ]
 build-backend = "setuptools.build_meta"
 
 [tool.setuptools.dynamic]
@@ -45,5 +45,5 @@ version = {attr = "OpenGL_accelerate.__version__"}
 [tool.setuptools.packages.find]
 namespaces=false
 include=["OpenGL_accelerate"]
-exclude=["tests","src"]
+exclude=["tests", "src"]
 
diff --git a/accelerate/src/vbo.pyx b/accelerate/src/vbo.pyx
index 13f9e99d..e4b0ce29 100644
--- a/accelerate/src/vbo.pyx
+++ b/accelerate/src/vbo.pyx
@@ -188,8 +188,8 @@ cdef class VBO:
         assert not self.created, """Already created the buffer"""
         buffers = self.get_implementation().glGenBuffers(1)
         try:
-            self.buffer = long( buffers )
-        except (TypeError,ValueError) as err:
+            self.buffer = int( buffers )
+        except (TypeError, ValueError) as err:
             self.buffer = buffers[0]
         self.target = self.c_resolve( self.target_spec )
         self.usage = self.c_resolve( self.usage_spec )
@@ -242,7 +242,7 @@ cdef class VBO:
         """Add an integer to this VBO (offset)"""
         if hasattr( other, 'offset' ):
             other = other.offset
-        assert isinstance( other, (int,long) ), """Only know how to add integer/long offsets"""
+        assert isinstance( other, int), """Only know how to add integer offsets"""
         return VBOOffset( self, other )
     cdef int check_live( self ):
         if self.data is _NULL: