diff --git a/docs/coding_style_guide.md b/docs/coding_style_guide.md
index b920b317..647ba259 100644
--- a/docs/coding_style_guide.md
+++ b/docs/coding_style_guide.md
@@ -88,12 +88,12 @@ if(x == 1){
 }
 ```
 
-## For `shared_ptr<T>`
+## For `std::shared_ptr<T>`
 
 Use a `_` suffix to indicate a type is a shared pointer.
 
 ```cpp
-typedef shared_ptr<CodeObject> CodeObject_;
-CodeObject_ co = make_shared<CodeObject>();
+using CodeObject_ = std::shared_ptr<CodeObject>;
+CodeObject_ co = std::make_shared<CodeObject>();
 ```
 
diff --git a/include/pocketpy/codeobject.h b/include/pocketpy/codeobject.h
index 78230ee9..9d1dd11c 100644
--- a/include/pocketpy/codeobject.h
+++ b/include/pocketpy/codeobject.h
@@ -48,9 +48,9 @@ struct CodeBlock {
 };
 
 struct CodeObject;
-typedef shared_ptr<CodeObject> CodeObject_;
 struct FuncDecl;
-using FuncDecl_ = shared_ptr<FuncDecl>;
+using CodeObject_ = std::shared_ptr<CodeObject>;
+using FuncDecl_ = std::shared_ptr<FuncDecl>;
 
 struct CodeObjectSerializer{
     std::string buffer;
@@ -92,7 +92,7 @@ struct CodeObjectSerializer{
 
 
 struct CodeObject {
-    shared_ptr<SourceData> src;
+    std::shared_ptr<SourceData> src;
     Str name;
     bool is_generator = false;
 
@@ -105,7 +105,7 @@ struct CodeObject {
     NameDictInt labels;
     std::vector<FuncDecl_> func_decls;
 
-    CodeObject(shared_ptr<SourceData> src, const Str& name);
+    CodeObject(std::shared_ptr<SourceData> src, const Str& name);
     void _gc_mark() const;
     void write(VM* vm, CodeObjectSerializer& ss) const;
     Str serialize(VM* vm) const;
diff --git a/include/pocketpy/lexer.h b/include/pocketpy/lexer.h
index ce9b63e5..d35d44e8 100644
--- a/include/pocketpy/lexer.h
+++ b/include/pocketpy/lexer.h
@@ -103,7 +103,7 @@ enum Precedence {
 enum StringType { NORMAL_STRING, RAW_STRING, F_STRING, NORMAL_BYTES };
 
 struct Lexer {
-    shared_ptr<SourceData> src;
+    std::shared_ptr<SourceData> src;
     const char* token_start;
     const char* curr_char;
     int current_line = 1;
@@ -137,7 +137,7 @@ struct Lexer {
     void SyntaxError(Str msg){ throw_err("SyntaxError", msg); }
     void SyntaxError(){ throw_err("SyntaxError", "invalid syntax"); }
     void IndentationError(Str msg){ throw_err("IndentationError", msg); }
-    Lexer(shared_ptr<SourceData> src);
+    Lexer(std::shared_ptr<SourceData> src);
     std::vector<Token> run();
 };
 
diff --git a/include/pocketpy/memory.h b/include/pocketpy/memory.h
index 54a1a905..53a384f3 100644
--- a/include/pocketpy/memory.h
+++ b/include/pocketpy/memory.h
@@ -249,68 +249,4 @@ struct MemoryPool{
 inline MemoryPool<64> pool64;
 inline MemoryPool<128> pool128;
 
-template <typename T>
-struct shared_ptr {
-    int* counter;
-
-    T* _t() const noexcept { return (T*)(counter + 1); }
-    void _inc_counter() { if(counter) ++(*counter); }
-    void _dec_counter() { if(counter && --(*counter) == 0) {((T*)(counter + 1))->~T(); pool128.dealloc(counter);} }
-
-public:
-    shared_ptr() : counter(nullptr) {}
-    shared_ptr(int* counter) : counter(counter) {}
-    shared_ptr(const shared_ptr& other) : counter(other.counter) {
-        _inc_counter();
-    }
-    shared_ptr(shared_ptr&& other) noexcept : counter(other.counter) {
-        other.counter = nullptr;
-    }
-    ~shared_ptr() { _dec_counter(); }
-
-    bool operator==(const shared_ptr& other) const { return counter == other.counter; }
-    bool operator!=(const shared_ptr& other) const { return counter != other.counter; }
-    bool operator<(const shared_ptr& other) const { return counter < other.counter; }
-    bool operator>(const shared_ptr& other) const { return counter > other.counter; }
-    bool operator<=(const shared_ptr& other) const { return counter <= other.counter; }
-    bool operator>=(const shared_ptr& other) const { return counter >= other.counter; }
-    bool operator==(std::nullptr_t) const { return counter == nullptr; }
-    bool operator!=(std::nullptr_t) const { return counter != nullptr; }
-
-    shared_ptr& operator=(const shared_ptr& other) {
-        _dec_counter();
-        counter = other.counter;
-        _inc_counter();
-        return *this;
-    }
-
-    shared_ptr& operator=(shared_ptr&& other) noexcept {
-        _dec_counter();
-        counter = other.counter;
-        other.counter = nullptr;
-        return *this;
-    }
-
-    T& operator*() const { return *_t(); }
-    T* operator->() const { return _t(); }
-    T* get() const { return _t(); }
-
-    int use_count() const { 
-        return counter ? *counter : 0;
-    }
-
-    void reset(){
-        _dec_counter();
-        counter = nullptr;
-    }
-};
-
-template <typename T, typename... Args>
-shared_ptr<T> make_sp(Args&&... args) {
-    int* p = (int*)pool128.alloc(sizeof(int) + sizeof(T));
-    *p = 1;
-    new(p+1) T(std::forward<Args>(args)...);
-    return shared_ptr<T>(p);
-}
-
 };  // namespace pkpy
diff --git a/include/pocketpy/namedict.h b/include/pocketpy/namedict.h
index 9ddf513f..07c54466 100644
--- a/include/pocketpy/namedict.h
+++ b/include/pocketpy/namedict.h
@@ -198,7 +198,7 @@ while(!_items[i].first.empty()) {       \
 };
 
 using NameDict = NameDictImpl<PyObject*>;
-using NameDict_ = shared_ptr<NameDict>;
+using NameDict_ = std::shared_ptr<NameDict>;
 using NameDictInt = NameDictImpl<int>;
 
 } // namespace pkpy
\ No newline at end of file
diff --git a/src/codeobject.cpp b/src/codeobject.cpp
index 65ce9286..d40b8c7d 100644
--- a/src/codeobject.cpp
+++ b/src/codeobject.cpp
@@ -2,7 +2,7 @@
 
 namespace pkpy{
 
-    CodeObject::CodeObject(shared_ptr<SourceData> src, const Str& name):
+    CodeObject::CodeObject(std::shared_ptr<SourceData> src, const Str& name):
         src(src), name(name) {}
 
     void CodeObject::_gc_mark() const {
diff --git a/src/compiler.cpp b/src/compiler.cpp
index 7dc30fcd..ce4934c0 100644
--- a/src/compiler.cpp
+++ b/src/compiler.cpp
@@ -9,14 +9,14 @@ namespace pkpy{
     }
 
     CodeObject_ Compiler::push_global_context(){
-        CodeObject_ co = make_sp<CodeObject>(lexer->src, lexer->src->filename);
+        CodeObject_ co = std::make_shared<CodeObject>(lexer->src, lexer->src->filename);
         contexts.push(CodeEmitContext(vm, co, contexts.size()));
         return co;
     }
 
     FuncDecl_ Compiler::push_f_context(Str name){
-        FuncDecl_ decl = make_sp<FuncDecl>();
-        decl->code = make_sp<CodeObject>(lexer->src, name);
+        FuncDecl_ decl = std::make_shared<FuncDecl>();
+        decl->code = std::make_shared<CodeObject>(lexer->src, name);
         decl->nested = name_scope() == NAME_LOCAL;
         contexts.push(CodeEmitContext(vm, decl->code, contexts.size()));
         return decl;
@@ -1008,7 +1008,7 @@ __SUBSCR_END:
         this->used = false;
         this->unknown_global_scope = unknown_global_scope;
         this->lexer = std::make_unique<Lexer>(
-            make_sp<SourceData>(source, filename, mode)
+            std::make_shared<SourceData>(source, filename, mode)
         );
         init_pratt_rules();
     }
diff --git a/src/frame.cpp b/src/frame.cpp
index 5df2957c..2fafd34e 100644
--- a/src/frame.cpp
+++ b/src/frame.cpp
@@ -8,7 +8,7 @@ namespace pkpy{
     }
 
     NameDict_ FastLocals::to_namedict(){
-        NameDict_ dict = make_sp<NameDict>();
+        NameDict_ dict = std::make_shared<NameDict>();
         varnames_inv->apply([&](StrName name, int index){
             PyObject* value = a[index];
             if(value != PY_NULL) dict->set(name, value);
diff --git a/src/lexer.cpp b/src/lexer.cpp
index 6bae2488..712d1198 100644
--- a/src/lexer.cpp
+++ b/src/lexer.cpp
@@ -449,7 +449,7 @@ static bool is_unicode_Lo_char(uint32_t c) {
         throw e;
     }
 
-    Lexer::Lexer(shared_ptr<SourceData> src) {
+    Lexer::Lexer(std::shared_ptr<SourceData> src) {
         this->src = src;
         this->token_start = src->source.c_str();
         this->curr_char = src->source.c_str();