diff --git a/direct/src/distributed/cConnectionRepository.cxx b/direct/src/distributed/cConnectionRepository.cxx
index 0eb40547ef..86b5869e14 100644
--- a/direct/src/distributed/cConnectionRepository.cxx
+++ b/direct/src/distributed/cConnectionRepository.cxx
@@ -711,6 +711,7 @@ handle_update_field() {
         nassertr(neverDisable != nullptr, false);
 
         unsigned int cNeverDisable = PyLong_AsLong(neverDisable);
+        Py_DECREF(neverDisable);
         if (!cNeverDisable) {
           // in quiet zone and distobj is disable-able drop update on the
           // floor
diff --git a/dtool/src/interrogatedb/py_compat.cxx b/dtool/src/interrogatedb/py_compat.cxx
index 722bc8300b..91fe93d456 100644
--- a/dtool/src/interrogatedb/py_compat.cxx
+++ b/dtool/src/interrogatedb/py_compat.cxx
@@ -33,7 +33,11 @@ size_t PyLongOrInt_AsSize_t(PyObject *vv) {
   size_t bytes;
   int one = 1;
   int res = _PyLong_AsByteArray((PyLongObject *)vv, (unsigned char *)&bytes,
-                                SIZEOF_SIZE_T, (int)*(unsigned char*)&one, 0);
+                                SIZEOF_SIZE_T, (int)*(unsigned char*)&one, 0,
+#if PY_VERSION_HEX >= 0x030d0000
+                                , 1 // with_exceptions
+#endif
+                                );
 
   if (res < 0) {
     return (size_t)res;
diff --git a/dtool/src/interrogatedb/py_compat.h b/dtool/src/interrogatedb/py_compat.h
index 4b67fba763..7ef6532c33 100644
--- a/dtool/src/interrogatedb/py_compat.h
+++ b/dtool/src/interrogatedb/py_compat.h
@@ -279,6 +279,12 @@ INLINE bool PyLong_IsNonNegative(PyObject *value) {
 }
 #endif
 
+/* Python 3.13 */
+
+#if PY_VERSION_HEX < 0x030D00A1
+#  define PyLong_AsInt(x) (_PyLong_AsInt(x))
+#endif
+
 /* Other Python implementations */
 
 #endif  // HAVE_PYTHON
diff --git a/dtool/src/interrogatedb/py_panda.cxx b/dtool/src/interrogatedb/py_panda.cxx
index b691fbef48..7cabfe0485 100644
--- a/dtool/src/interrogatedb/py_panda.cxx
+++ b/dtool/src/interrogatedb/py_panda.cxx
@@ -886,7 +886,9 @@ bool Dtool_ExtractOptionalArg(PyObject **result, PyObject *args, PyObject *kwds,
       }
 
       // We got the item, we just need to make sure that it had the right key.
-#if PY_VERSION_HEX >= 0x03060000
+#if PY_VERSION_HEX >= 0x030d0000
+      return PyUnicode_CheckExact(key) && PyUnicode_EqualToUTF8(key, keyword);
+#elif PY_VERSION_HEX >= 0x03060000
       return PyUnicode_CheckExact(key) && _PyUnicode_EqualToASCIIString(key, keyword);
 #elif PY_MAJOR_VERSION >= 3
       return PyUnicode_CheckExact(key) && PyUnicode_CompareWithASCIIString(key, keyword) == 0;
diff --git a/panda/src/cocoadisplay/cocoaGraphicsWindow.mm b/panda/src/cocoadisplay/cocoaGraphicsWindow.mm
index 3cafabab1c..01c7ab8f63 100644
--- a/panda/src/cocoadisplay/cocoaGraphicsWindow.mm
+++ b/panda/src/cocoadisplay/cocoaGraphicsWindow.mm
@@ -46,6 +46,12 @@ TypeHandle CocoaGraphicsWindow::_type_handle;
 #define NSAppKitVersionNumber10_14 1671
 #endif
 
+#if __MAC_OS_X_VERSION_MAX_ALLOWED < 1070
+enum {
+  NSFullScreenWindowMask = 1 << 14
+};
+#endif
+
 /**
  *
  */
diff --git a/panda/src/putil/bitArray_ext.cxx b/panda/src/putil/bitArray_ext.cxx
index 2a48951040..b454593d1b 100644
--- a/panda/src/putil/bitArray_ext.cxx
+++ b/panda/src/putil/bitArray_ext.cxx
@@ -32,7 +32,11 @@ __init__(PyObject *init_value) {
     _PyLong_AsByteArray((PyLongObject *)init_value,
       (unsigned char *)&_this->_array[0],
       num_words * sizeof(BitArray::WordType),
-      1, 0);
+      1, 0
+#if PY_VERSION_HEX >= 0x030d0000
+      , 1 // with_exceptions
+#endif
+      );
   }
 }
 
diff --git a/panda/src/putil/doubleBitMask_ext.I b/panda/src/putil/doubleBitMask_ext.I
index a40b91355d..1674cccd49 100644
--- a/panda/src/putil/doubleBitMask_ext.I
+++ b/panda/src/putil/doubleBitMask_ext.I
@@ -31,7 +31,11 @@ __init__(PyObject *init_value) {
   if (n > 0) {
     size_t num_bytes = (n + 7) / 8;
     unsigned char *bytes = (unsigned char *)alloca(num_bytes);
-    _PyLong_AsByteArray((PyLongObject *)init_value, bytes, num_bytes, 1, 0);
+    _PyLong_AsByteArray((PyLongObject *)init_value, bytes, num_bytes, 1, 0
+#if PY_VERSION_HEX >= 0x030d0000
+      , 1 // with_exceptions
+#endif
+    );
 
     for (size_t i = 0; i < num_bytes; ++i) {
       this->_this->store(bytes[i], i * 8, 8);
@@ -58,7 +62,13 @@ __int__() const {
   if (!this->_this->_hi.is_zero()) {
     PyObject *lo = result;
     PyObject *hi = invoke_extension(&this->_this->_hi).__int__();
+#if PY_VERSION_HEX >= 0x030d0000
+    PyObject *half_bits = PyLong_FromUnsignedLong(DoubleBitMask<BMType>::half_bits);
+    PyObject *shifted = PyNumber_Lshift(hi, half_bits);
+    Py_DECREF(half_bits);
+#else
     PyObject *shifted = _PyLong_Lshift(hi, DoubleBitMask<BMType>::half_bits);
+#endif
     Py_DECREF(hi);
     result = PyNumber_Or(shifted, lo);
     Py_DECREF(shifted);
diff --git a/pandatool/src/deploy-stub/deploy-stub.c b/pandatool/src/deploy-stub/deploy-stub.c
index 7e0b22464d..6cd2c2803c 100644
--- a/pandatool/src/deploy-stub/deploy-stub.c
+++ b/pandatool/src/deploy-stub/deploy-stub.c
@@ -712,7 +712,9 @@ int main(int argc, char *argv[]) {
       new_moddef->code = moddef->code;
       new_moddef->size = moddef->size < 0 ? -(moddef->size) : moddef->size;
       new_moddef->is_package = moddef->size < 0;
+#if PY_VERSION_HEX < 0x030d0000 // 3.13
       new_moddef->get_code = NULL;
+#endif
       new_moddef++;
     }
 #endif