diff --git a/py_src/bind_vector_copy.h b/py_src/bind_vector_copy.h
index 2f4bd88..8a57f40 100644
--- a/py_src/bind_vector_copy.h
+++ b/py_src/bind_vector_copy.h
@@ -64,10 +64,10 @@ nanobind::class_<Vector> bind_vector_copy(nanobind::handle scope, const char *na
         cl.def(init<const Vector &>(),
                "Copy constructor");
 
-        cl.def("__init__", [](Vector *v, typed<iterable, detail::iterable_type_id<Value>> &seq) {
+        cl.def("__init__", [](Vector *v, typed<iterable, Value> &seq) {
             new (v) Vector();
-            v->reserve(len_hint(seq.value));
-            for (handle h : seq.value)
+            v->reserve(len_hint(seq));
+            for (handle h : seq)
                 v->push_back(cast<Value>(h));
         }, "Construct from an iterable object");
 
@@ -248,10 +248,10 @@ nanobind::class_<std::shared_ptr<Vector>> bind_shared_vector_copy(nanobind::hand
             new (self) self_t(std::move(std::make_shared<Vector>(*other)));
         }, "Shallow Copy constructor");
 
-        cl.def("__init__", [](self_t &v, typed<iterable, detail::iterable_type_id<Value>> &seq) {
+        cl.def("__init__", [](self_t &v, typed<iterable, Value> &seq) {
             new (&v) self_t(std::move(std::make_shared<Vector>()));
-            v->reserve(len_hint(seq.value));
-            for (handle h : seq.value)
+            v->reserve(len_hint(seq));
+            for (handle h : seq)
                 v->push_back(cast<Value>(h));
         }, "Construct from an iterable object");
 
@@ -457,10 +457,10 @@ nanobind::class_<std::shared_ptr<pycontainer::pyvec<T>>> bind_shared_pyvec(nanob
             new (self) self_t(std::move(std::make_shared<Vector>(*other)));
         }, "Shallow Copy constructor");
 
-        cl.def("__init__", [](self_t &v, typed<iterable, detail::iterable_type_id<ValueRef>> &seq) {
+        cl.def("__init__", [](self_t &v, typed<iterable, ValueRef> &seq) {
             new (&v) self_t(std::move(std::make_shared<Vector>()));
-            v->reserve(len_hint(seq.value));
-            for (handle h : seq.value)
+            v->reserve(len_hint(seq));
+            for (handle h : seq)
                 v->push_back(*cast<ValueRef>(h));
         }, "Construct from an iterable object");
 
diff --git a/py_src/core.cpp b/py_src/core.cpp
index 86bd4d4..848e2da 100644
--- a/py_src/core.cpp
+++ b/py_src/core.cpp
@@ -173,12 +173,14 @@ auto bind_track(nb::module_& m, const std::string& name_) {
                 mode_enums[i] = str_to_pianoroll_mode(modes[i]);
             }
             auto pianoroll = TrackPianoroll::from_track(*self, mode_enums, pitch_range, encode_velocity);
+            auto* data = const_cast<u8*>(pianoroll.release());
+            nb::capsule owner(data, [](void* d) noexcept { delete[] (u8*) d; });
             return nb::ndarray<nb::numpy, pianoroll_t>{
-                const_cast<u8*>(pianoroll.release()), {
+                data, {
                     std::get<0>(pianoroll.dims()),
                     std::get<1>(pianoroll.dims()),
                     std::get<2>(pianoroll.dims()),
-                }
+                }, owner
             };
         });
     }
@@ -522,12 +524,15 @@ auto bind_score(nb::module_& m, const std::string& name_) {
                 }
                 auto pianoroll
                     = ScorePianoroll::from_score(*self, mode_enums, pitch_range, encode_velocity);
+                auto* data = const_cast<u8*>(pianoroll.release());
+                nb::capsule owner(data, [](void* d) noexcept { delete[] (u8*) d; });
                 return nb::ndarray<nb::numpy, pianoroll_t>{
-                    const_cast<u8*>(pianoroll.release()),
-                    {std::get<0>(pianoroll.dims()),
-                     std::get<1>(pianoroll.dims()),
-                     std::get<2>(pianoroll.dims()),
-                     std::get<3>(pianoroll.dims())}
+                    data, {
+                        std::get<0>(pianoroll.dims()),
+                        std::get<1>(pianoroll.dims()),
+                        std::get<2>(pianoroll.dims()),
+                        std::get<3>(pianoroll.dims())
+                    },  owner
                 };
             },
             nb::arg("modes"),
diff --git a/pyproject.toml b/pyproject.toml
index 43878bb..9179fe0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -3,7 +3,7 @@ requires = [
     "setuptools>=42",
     "scikit-build>=0.13",
     "scikit-build-core>=0.3.3",
-    "nanobind>=1.8.0",
+    "nanobind>=2.0.0",
     "cmake>=3.20",
     "ninja",
 ]