diff --git a/core/src/avm2/object.rs b/core/src/avm2/object.rs
index 8e3b50977..bfa5e1153 100644
--- a/core/src/avm2/object.rs
+++ b/core/src/avm2/object.rs
@@ -1409,7 +1409,7 @@ impl<'gc> Object<'gc> {
             Self::Program3DObject(o) => WeakObject::Program3DObject(Program3DObjectWeak(Gc::downgrade(o.0))),
             Self::NetStreamObject(o) => WeakObject::NetStreamObject(NetStreamObjectWeak(Gc::downgrade(o.0))),
             Self::NetConnectionObject(o) => WeakObject::NetConnectionObject(NetConnectionObjectWeak(Gc::downgrade(o.0))),
-            Self::ResponderObject(o) => WeakObject::ResponderObject(ResponderObjectWeak(GcCell::downgrade(o.0))),
+            Self::ResponderObject(o) => WeakObject::ResponderObject(ResponderObjectWeak(Gc::downgrade(o.0))),
             Self::ShaderDataObject(o) => WeakObject::ShaderDataObject(ShaderDataObjectWeak(Gc::downgrade(o.0))),
             Self::SocketObject(o) => WeakObject::SocketObject(SocketObjectWeak(Gc::downgrade(o.0))),
             Self::FileReferenceObject(o) => WeakObject::FileReferenceObject(FileReferenceObjectWeak(Gc::downgrade(o.0))),
diff --git a/core/src/avm2/object/responder_object.rs b/core/src/avm2/object/responder_object.rs
index 40a07005a..ca169f0bd 100644
--- a/core/src/avm2/object/responder_object.rs
+++ b/core/src/avm2/object/responder_object.rs
@@ -5,8 +5,11 @@ use crate::avm2::{Activation, Error};
 use crate::context::UpdateContext;
 use crate::net_connection::ResponderCallback;
 use flash_lso::types::Value as AMFValue;
-use gc_arena::Mutation;
-use gc_arena::{Collect, GcCell, GcWeakCell};
+use gc_arena::barrier::unlock;
+use gc_arena::{
+    lock::{Lock, RefLock},
+    Collect, Gc, GcWeak, Mutation,
+};
 use std::cell::{Ref, RefMut};
 use std::fmt;
 
@@ -15,14 +18,14 @@ pub fn responder_allocator<'gc>(
     class: ClassObject<'gc>,
     activation: &mut Activation<'_, 'gc>,
 ) -> Result<Object<'gc>, Error<'gc>> {
-    let base = ScriptObjectData::new(class);
+    let base = ScriptObjectData::new(class).into();
 
-    Ok(ResponderObject(GcCell::new(
+    Ok(ResponderObject(Gc::new(
         activation.context.gc(),
         ResponderObjectData {
             base,
-            result: Default::default(),
-            status: Default::default(),
+            result: Lock::new(None),
+            status: Lock::new(None),
         },
     ))
     .into())
@@ -30,23 +33,23 @@ pub fn responder_allocator<'gc>(
 
 #[derive(Clone, Collect, Copy)]
 #[collect(no_drop)]
-pub struct ResponderObject<'gc>(pub GcCell<'gc, ResponderObjectData<'gc>>);
+pub struct ResponderObject<'gc>(pub Gc<'gc, ResponderObjectData<'gc>>);
 
 #[derive(Clone, Collect, Copy, Debug)]
 #[collect(no_drop)]
-pub struct ResponderObjectWeak<'gc>(pub GcWeakCell<'gc, ResponderObjectData<'gc>>);
+pub struct ResponderObjectWeak<'gc>(pub GcWeak<'gc, ResponderObjectData<'gc>>);
 
 impl<'gc> TObject<'gc> for ResponderObject<'gc> {
     fn base(&self) -> Ref<ScriptObjectData<'gc>> {
-        Ref::map(self.0.read(), |read| &read.base)
+        self.0.base.borrow()
     }
 
     fn base_mut(&self, mc: &Mutation<'gc>) -> RefMut<ScriptObjectData<'gc>> {
-        RefMut::map(self.0.write(mc), |write| &mut write.base)
+        unlock!(Gc::write(mc, self.0), ResponderObjectData, base).borrow_mut()
     }
 
     fn as_ptr(&self) -> *const ObjectPtr {
-        self.0.as_ptr() as *const ObjectPtr
+        Gc::as_ptr(self.0) as *const ObjectPtr
     }
 
     fn value_of(&self, _mc: &Mutation<'gc>) -> Result<Value<'gc>, Error<'gc>> {
@@ -60,21 +63,21 @@ impl<'gc> TObject<'gc> for ResponderObject<'gc> {
 
 impl<'gc> ResponderObject<'gc> {
     pub fn result(&self) -> Option<FunctionObject<'gc>> {
-        self.0.read().result
+        self.0.result.get()
     }
 
     pub fn status(&self) -> Option<FunctionObject<'gc>> {
-        self.0.read().status
+        self.0.status.get()
     }
 
     pub fn set_callbacks(
         &self,
-        gc_context: &Mutation<'gc>,
+        mc: &Mutation<'gc>,
         result: Option<FunctionObject<'gc>>,
         status: Option<FunctionObject<'gc>>,
     ) {
-        self.0.write(gc_context).result = result;
-        self.0.write(gc_context).status = status;
+        unlock!(Gc::write(mc, self.0), ResponderObjectData, result).set(result);
+        unlock!(Gc::write(mc, self.0), ResponderObjectData, status).set(status);
     }
 
     pub fn send_callback(
@@ -84,8 +87,8 @@ impl<'gc> ResponderObject<'gc> {
         message: &AMFValue,
     ) -> Result<(), Error<'gc>> {
         let function = match callback {
-            ResponderCallback::Result => self.0.read().result,
-            ResponderCallback::Status => self.0.read().status,
+            ResponderCallback::Result => self.0.result.get(),
+            ResponderCallback::Status => self.0.status.get(),
         };
 
         if let Some(function) = function {
@@ -102,13 +105,13 @@ impl<'gc> ResponderObject<'gc> {
 #[collect(no_drop)]
 pub struct ResponderObjectData<'gc> {
     /// Base script object
-    base: ScriptObjectData<'gc>,
+    base: RefLock<ScriptObjectData<'gc>>,
 
     /// Method to call with any result
-    result: Option<FunctionObject<'gc>>,
+    result: Lock<Option<FunctionObject<'gc>>>,
 
     /// Method to call with status info (likely errors)
-    status: Option<FunctionObject<'gc>>,
+    status: Lock<Option<FunctionObject<'gc>>>,
 }
 
 impl fmt::Debug for ResponderObject<'_> {