diff --git a/mmtk/Cargo.toml b/mmtk/Cargo.toml
index a437334..33a77e3 100644
--- a/mmtk/Cargo.toml
+++ b/mmtk/Cargo.toml
@@ -27,7 +27,7 @@ log = "*"
 # - change branch
 # - change repo name
 # But other changes including adding/removing whitespaces in commented lines may break the CI.
-mmtk = { git = "https://github.com/mmtk/mmtk-core.git", rev = "571a857b75e648ca4c711d56fbf400d99173398f" }
+mmtk = { git = "https://github.com/mmtk/mmtk-core.git", rev = "f0fed5fc01438162115120c7551d4eb96e888bc2" }
 # Uncomment the following and fix the path to mmtk-core to build locally
 # mmtk = { path = "../repos/mmtk-core" }
 
diff --git a/mmtk/src/collection.rs b/mmtk/src/collection.rs
index f0fdb95..edd7c68 100644
--- a/mmtk/src/collection.rs
+++ b/mmtk/src/collection.rs
@@ -1,7 +1,6 @@
-use mmtk::scheduler::ProcessEdgesWork;
 use mmtk::util::opaque_pointer::*;
 use mmtk::vm::{Collection, GCThreadContext};
-use mmtk::MutatorContext;
+use mmtk::{Mutator, MutatorContext};
 
 use UPCALLS;
 use V8;
@@ -12,7 +11,10 @@ const GC_THREAD_KIND_WORKER: libc::c_int = 1;
 pub struct VMCollection {}
 
 impl Collection<V8> for VMCollection {
-    fn stop_all_mutators<E: ProcessEdgesWork<VM = V8>>(tls: VMWorkerThread) {
+    fn stop_all_mutators<F>(tls: VMWorkerThread, _mutator_visitor: F)
+    where
+        F: FnMut(&'static mut Mutator<V8>),
+    {
         unsafe {
             ((*UPCALLS).stop_all_mutators)(tls);
         }
diff --git a/mmtk/src/scanning.rs b/mmtk/src/scanning.rs
index a7d4e5d..2f110d8 100644
--- a/mmtk/src/scanning.rs
+++ b/mmtk/src/scanning.rs
@@ -1,7 +1,7 @@
-use mmtk::scheduler::ProcessEdgesWork;
 use mmtk::util::opaque_pointer::*;
 use mmtk::util::ObjectReference;
 use mmtk::vm::EdgeVisitor;
+use mmtk::vm::RootsWorkFactory;
 use mmtk::vm::Scanning;
 use mmtk::Mutator;
 use V8;
@@ -24,18 +24,19 @@ impl Scanning<V8> for VMScanning {
         unimplemented!()
     }
 
-    fn scan_thread_roots<W: ProcessEdgesWork<VM = V8>>() {
+    fn scan_thread_roots(_tls: VMWorkerThread, _factory: impl RootsWorkFactory) {
         unimplemented!()
     }
 
-    fn scan_thread_root<W: ProcessEdgesWork<VM = V8>>(
-        _mutator: &'static mut Mutator<V8>,
+    fn scan_thread_root(
         _tls: VMWorkerThread,
+        _mutator: &'static mut Mutator<V8>,
+        _factory: impl RootsWorkFactory,
     ) {
         unimplemented!()
     }
 
-    fn scan_vm_specific_roots<W: ProcessEdgesWork<VM = V8>>() {
+    fn scan_vm_specific_roots(_tls: VMWorkerThread, _factory: impl RootsWorkFactory) {
         unimplemented!()
     }