diff --git a/lib/sead b/lib/sead
index 71855f04..57301b4c 160000
--- a/lib/sead
+++ b/lib/sead
@@ -1 +1 @@
-Subproject commit 71855f048ff11c9520e13377efff2ac1f47166ef
+Subproject commit 57301b4c5c6aa257e63860e2f6ae5872ef8d2af4
diff --git a/src/KingSystem/Utils/HeapUtil.h b/src/KingSystem/Utils/HeapUtil.h
index 599791ef..a803db85 100644
--- a/src/KingSystem/Utils/HeapUtil.h
+++ b/src/KingSystem/Utils/HeapUtil.h
@@ -1,13 +1,49 @@
 #pragma once
 
 #include <basis/seadTypes.h>
-
-namespace sead {
-class Heap;
-}
+#include <heap/seadExpHeap.h>
+#include <heap/seadHeap.h>
+#include "KingSystem/Utils/Types.h"
 
 namespace ksys::util {
 
+class DualHeap : public sead::ExpHeap {
+    SEAD_RTTI_OVERRIDE(DualHeap, sead::ExpHeap)
+
+public:
+    static DualHeap* tryCreate(size_t size, const sead::SafeString& name, Heap* parent1,
+                               Heap* parent2, s32 alignment, HeapDirection direction, bool b);
+    static DualHeap* create(size_t size, const sead::SafeString& name, Heap* parent1, Heap* parent2,
+                            s32 alignment, HeapDirection direction, bool b);
+
+    void* tryAlloc(size_t size, s32 alignment, bool* ok);
+
+    void* tryAlloc(size_t size, s32 alignment) override;
+    void free(void* ptr) override;
+    void* resizeFront(void* p_void, size_t size) override;
+    void* resizeBack(void* p_void, size_t size) override;
+    void* tryRealloc(void* ptr, size_t size, s32 alignment) override;
+    void freeAll() override;
+    size_t getFreeSize() const override;
+    size_t getMaxAllocatableSize(int alignment) const override;
+    bool isResizable() const override;
+    bool isAdjustable() const override;
+    void dumpYAML(sead::WriteStream& stream, int i) const override;
+    void genInformation_(sead::hostio::Context* context) override;
+    void makeMetaString_(sead::BufferedSafeString* string) override;
+
+protected:
+    DualHeap(size_t size, const sead::SafeString& name, Heap* parent1, Heap* parent2, s32 alignment,
+             HeapDirection direction, bool b);
+    ~DualHeap() override;
+
+    sead::Heap* mHeap;
+    void* _118;
+    u8 _120;
+    void* _128;
+};
+KSYS_CHECK_SIZE_NX150(DualHeap, 0x130);
+
 /// Returns the specified heap if it is not null. Otherwise, this returns the current heap.
 sead::Heap* getHeapOrCurrentHeap(sead::Heap* heap);