diff --git a/convert.go b/convert.go
index 4b5b0b0..52e4b68 100644
--- a/convert.go
+++ b/convert.go
@@ -149,16 +149,15 @@ func ToValue(from Object, to reflect.Value) bool {
 			t := to.Type()
 			to.Set(reflect.MakeMap(t))
 			dict := cast[Dict](from)
-			iter := dict.Iter()
-			for iter.HasNext() {
-				key, value := iter.Next()
+			dict.Items()(func(key, value Object) bool {
 				vk := reflect.New(t.Key()).Elem()
 				vv := reflect.New(t.Elem()).Elem()
 				if !ToValue(key, vk) || !ToValue(value, vv) {
 					return false
 				}
 				to.SetMapIndex(vk, vv)
-			}
+				return true
+			})
 			return true
 		} else {
 			return false
diff --git a/dict.go b/dict.go
index d1d214e..606e77f 100644
--- a/dict.go
+++ b/dict.go
@@ -2,6 +2,26 @@ package gp
 
 /*
 #include <Python.h>
+
+typedef struct pyCriticalSection {
+    uintptr_t _cs_prev;
+    void *_cs_mutex;
+} pyCriticalSection;
+static inline void pyCriticalSection_Begin(pyCriticalSection *pcs, PyObject *op) {
+#if PY_VERSION_HEX >= 0x030D0000
+    PyCriticalSection_Begin((PyCriticalSection*)pcs, op);
+#else
+    PyGILState_STATE gstate = PyGILState_Ensure();
+		pcs->_cs_prev = (uintptr_t)gstate;
+#endif
+}
+static inline void pyCriticalSection_End(pyCriticalSection *pcs) {
+#if PY_VERSION_HEX >= 0x030D0000
+    PyCriticalSection_End((PyCriticalSection*)pcs);
+#else
+    PyGILState_Release((PyGILState_STATE)pcs->_cs_prev);
+#endif
+}
 */
 import "C"
 import (
@@ -75,26 +95,18 @@ func (d Dict) Del(key Objecter) {
 	C.PyDict_DelItem(d.obj, key.cpyObj())
 }
 
-func (d Dict) Iter() *DictIter {
-	return &DictIter{dict: d, pos: 0}
-}
-
-type DictIter struct {
-	dict Dict
-	pos  C.long
-}
-
-func (d *DictIter) HasNext() bool {
-	pos := d.pos
-	return C.PyDict_Next(d.dict.obj, &pos, nil, nil) != 0
-}
-
-func (d *DictIter) Next() (Object, Object) {
-	var key, value *C.PyObject
-	if C.PyDict_Next(d.dict.obj, &d.pos, &key, &value) == 0 {
-		return Nil(), Nil()
+func (d Dict) Items() func(func(Object, Object) bool) {
+	obj := d.cpyObj()
+	var cs C.pyCriticalSection
+	C.pyCriticalSection_Begin(&cs, obj)
+	return func(fn func(Object, Object) bool) {
+		defer C.pyCriticalSection_End(&cs)
+		var pos C.long
+		var key, value *C.PyObject
+		for C.PyDict_Next(obj, &pos, &key, &value) == 1 {
+			if !fn(newObject(key), newObject(value)) {
+				return
+			}
+		}
 	}
-	C.Py_IncRef(key)
-	C.Py_IncRef(value)
-	return newObject(key), newObject(value)
 }
diff --git a/dict_test.go b/dict_test.go
index ab4139d..38adc42 100644
--- a/dict_test.go
+++ b/dict_test.go
@@ -155,16 +155,15 @@ func TestDictForEach(t *testing.T) {
 		"key3": "value3",
 	}
 
-	iter := dict.Iter()
-	for iter.HasNext() {
-		key, value := iter.Next()
+	dict.Items()(func(key, value Object) bool {
 		count++
 		k := key.String()
 		v := value.String()
 		if expectedVal, ok := expectedPairs[k]; !ok || expectedVal != v {
 			t.Errorf("ForEach() unexpected pair: %v: %v", k, v)
 		}
-	}
+		return true
+	})
 
 	if count != len(expectedPairs) {
 		t.Errorf("ForEach() visited %d pairs, want %d", count, len(expectedPairs))
diff --git a/extension.go b/extension.go
index 1158649..a0d68ff 100644
--- a/extension.go
+++ b/extension.go
@@ -272,7 +272,7 @@ func wrapperMethod_(typeMeta *typeMeta, methodMeta *slotMeta, self, args *C.PyOb
 	}
 
 	for i := 0; i < int(argc); i++ {
-		arg := C.PyTuple_GetItem(args, C.Py_ssize_t(i))
+		arg := C.PySequence_GetItem(args, C.Py_ssize_t(i))
 		argType := methodType.In(i + argIndex)
 		argPy := FromPy(arg)
 		goValue := reflect.New(argType).Elem()
diff --git a/list.go b/list.go
index 0d38f97..3c99973 100644
--- a/list.go
+++ b/list.go
@@ -24,9 +24,7 @@ func MakeList(args ...any) List {
 }
 
 func (l List) GetItem(index int) Object {
-	v := C.PyList_GetItem(l.obj, C.Py_ssize_t(index))
-	C.Py_IncRef(v)
-	return newObject(v)
+	return newObject(C.PySequence_GetItem(l.obj, C.Py_ssize_t(index)))
 }
 
 func (l List) SetItem(index int, item Objecter) {
diff --git a/tuple.go b/tuple.go
index bdc8b55..2e48eec 100644
--- a/tuple.go
+++ b/tuple.go
@@ -28,9 +28,7 @@ func MakeTuple(args ...any) Tuple {
 }
 
 func (t Tuple) Get(index int) Object {
-	v := C.PyTuple_GetItem(t.obj, C.Py_ssize_t(index))
-	C.Py_IncRef(v)
-	return newObject(v)
+	return newObject(C.PySequence_GetItem(t.obj, C.Py_ssize_t(index)))
 }
 
 func (t Tuple) Set(index int, obj Objecter) {