diff --git a/python/jittor/__init__.py b/python/jittor/__init__.py
index ca4d0b6f..1100ced6 100644
--- a/python/jittor/__init__.py
+++ b/python/jittor/__init__.py
@@ -9,7 +9,7 @@
 # file 'LICENSE.txt', which is part of this source code package.
 # ***************************************************************
 
-__version__ = '1.3.5.41'
+__version__ = '1.3.5.42'
 from jittor_utils import lock
 with lock.lock_scope():
     ori_int = int
diff --git a/python/jittor/src/var_holder.cc b/python/jittor/src/var_holder.cc
index dd23970f..25f090cb 100644
--- a/python/jittor/src/var_holder.cc
+++ b/python/jittor/src/var_holder.cc
@@ -133,6 +133,9 @@ string VarHolder::to_string() {
 }
 
 VarHolder* VarHolder::assign(VarHolder* v) {
+    if (th_mode) {
+        v->set_requires_grad(get_requires_grad());
+    }
     assign_var(v->var, var);
     v->var->own_both_liveness();
     var->release_both_liveness();