diff --git a/Lib/importlib/_bootstrap_external.py b/Lib/importlib/_bootstrap_external.py
index ac178fabcd2027..71c61af774094c 100644
--- a/Lib/importlib/_bootstrap_external.py
+++ b/Lib/importlib/_bootstrap_external.py
@@ -372,7 +372,7 @@ def _write_atomic(path, data, mode=0o666):
 # Whenever MAGIC_NUMBER is changed, the ranges in the magic_values array
 # in PC/launcher.c must also be updated.
 
-MAGIC_NUMBER = (9994).to_bytes(2, 'little') + b'\r\n'
+MAGIC_NUMBER = (9996).to_bytes(2, 'little') + b'\r\n'
 _RAW_MAGIC_NUMBER = int.from_bytes(MAGIC_NUMBER, 'little')  # For import.c
 
 _PYCACHE = '__pycache__'
diff --git a/Objects/codeobject.c b/Objects/codeobject.c
index 278ee43860e112..ad889ddb288ce2 100644
--- a/Objects/codeobject.c
+++ b/Objects/codeobject.c
@@ -324,6 +324,7 @@ init_code(PyCodeObject *co, struct _PyCodeConstructor *con)
     co->co_name = con->name;
     Py_INCREF(con->qualname);
     co->co_qualname = con->qualname;
+
     co->co_flags = con->flags;
 
     Py_XINCREF(con->code);
@@ -420,6 +421,10 @@ _PyCode_New(struct _PyCodeConstructor *con)
         PyErr_NoMemory();
         return NULL;
     }
+    co->co_filename = NULL;
+    co->co_name = NULL;
+    co->co_qualname = NULL;
+
     init_code(co, con);
 
     return co;
@@ -442,7 +447,11 @@ _PyCode_Update(struct _PyCodeConstructor *con, PyCodeObject *code)
         con->columntable = Py_None;
     }
 
-    init_code(code, con);  // TODO: This leaks!
+    Py_XDECREF(code->co_filename);
+    Py_XDECREF(code->co_name);
+    Py_XDECREF(code->co_qualname);
+
+    init_code(code, con);
 
     return code;
 }
diff --git a/Python/importlib_external.h b/Python/importlib_external.h
index d87b1dc1204127..501465be220d24 100644
--- a/Python/importlib_external.h
+++ b/Python/importlib_external.h
@@ -591,7 +591,7 @@ const unsigned char _Py_M__importlib_bootstrap_external[] = {
     32,32,32,32,116,101,109,112,111,114,97,114,121,32,102,105,
     108,101,32,105,115,32,97,116,116,101,109,112,116,101,100,46,
     250,5,123,125,46,123,125,114,146,0,0,0,90,2,119,98,
-    78,105,10,39,0,0,114,115,0,0,0,114,109,0,0,0,
+    78,105,12,39,0,0,114,115,0,0,0,114,109,0,0,0,
     115,2,0,0,0,13,10,90,11,95,95,112,121,99,97,99,
     104,101,95,95,122,4,111,112,116,45,122,3,46,112,121,122,
     4,46,112,121,119,122,4,46,112,121,99,41,1,218,12,111,