diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 739a432..a22211f 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -1,6 +1,10 @@
 Version 3.0.2 (in development)
 ------------------------------
 
+* Support not just Fraction and int types as inputs for gmp values,
+  but every type with denominator and numerator attributes (such as numpy's
+  int32 and int64, and gmpy2's mpq).
+
 Version 3.0.1 (22 November 2024)
 --------------------------------
 
diff --git a/pyproject.toml b/pyproject.toml
index 677bc13..786d3c9 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -53,3 +53,7 @@ cdd = ["py.typed"]
 [tool.mypy]
 files = ["src/**/*.pyi", "test/**/*.py", "docs/**/*.py"]
 disallow_untyped_defs = true
+
+[[tool.mypy.overrides]]
+module = "gmpy2"
+ignore_missing_imports = true
diff --git a/test/gmp/__init__.py b/test/gmp/__init__.py
index 1360a0f..9db7ff0 100644
--- a/test/gmp/__init__.py
+++ b/test/gmp/__init__.py
@@ -1,8 +1,13 @@
 from collections.abc import Iterable
-from fractions import Fraction
-from typing import Union
+from typing import Any, Protocol
 
-Rational = Union[int, Fraction]
+
+class Rational(Protocol):
+    @property
+    def numerator(self) -> int: ...
+    @property
+    def denominator(self) -> int: ...
+    def __eq__(self, other: Any) -> bool: ...
 
 
 def assert_exactly_equal(x: Rational, y: Rational) -> None:
diff --git a/test/gmp/test_gmpy2.py b/test/gmp/test_gmpy2.py
new file mode 100644
index 0000000..aae73b1
--- /dev/null
+++ b/test/gmp/test_gmpy2.py
@@ -0,0 +1,19 @@
+from collections.abc import Sequence
+from test.gmp import assert_matrix_exactly_equal
+
+from gmpy2 import mpq
+
+import cdd
+import cdd.gmp
+
+
+def test_numpy() -> None:
+    q0 = mpq(0)
+    q1 = mpq(1)
+    arr: Sequence[Sequence[mpq]] = [[q1, q0, q0], [q1, q1, q0], [q1, q0, q1]]
+    ref_ineq: Sequence[Sequence[mpq]] = [[q1, -q1, -q1], [q0, q1, q0], [q0, q0, q1]]
+    mat = cdd.gmp.matrix_from_array(arr)
+    mat.rep_type = cdd.RepType.GENERATOR
+    cdd_poly = cdd.gmp.polyhedron_from_matrix(mat)
+    ineq = cdd.gmp.copy_inequalities(cdd_poly).array
+    assert_matrix_exactly_equal(ref_ineq, ineq)