diff --git a/mmtk/Cargo.lock b/mmtk/Cargo.lock
index e1a285e..a46bb88 100644
--- a/mmtk/Cargo.lock
+++ b/mmtk/Cargo.lock
@@ -424,8 +424,8 @@ dependencies = [
 
 [[package]]
 name = "mmtk"
-version = "0.24.0"
-source = "git+https://github.com/mmtk/mmtk-core.git?rev=a02803b4104519ff2289234101a2dd8ceedd1bc7#a02803b4104519ff2289234101a2dd8ceedd1bc7"
+version = "0.25.0"
+source = "git+https://github.com/mmtk/mmtk-core.git?rev=56b2521d2b99848ee0613a0a5288fe6d81b754ba#56b2521d2b99848ee0613a0a5288fe6d81b754ba"
 dependencies = [
  "atomic",
  "atomic-traits",
@@ -459,8 +459,8 @@ dependencies = [
 
 [[package]]
 name = "mmtk-macros"
-version = "0.24.0"
-source = "git+https://github.com/mmtk/mmtk-core.git?rev=a02803b4104519ff2289234101a2dd8ceedd1bc7#a02803b4104519ff2289234101a2dd8ceedd1bc7"
+version = "0.25.0"
+source = "git+https://github.com/mmtk/mmtk-core.git?rev=56b2521d2b99848ee0613a0a5288fe6d81b754ba#56b2521d2b99848ee0613a0a5288fe6d81b754ba"
 dependencies = [
  "proc-macro-error",
  "proc-macro2",
diff --git a/mmtk/Cargo.toml b/mmtk/Cargo.toml
index face613..11a771a 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 = "a02803b4104519ff2289234101a2dd8ceedd1bc7" }
+mmtk = { git = "https://github.com/mmtk/mmtk-core.git", rev = "56b2521d2b99848ee0613a0a5288fe6d81b754ba" }
 # Uncomment the following and fix the path to mmtk-core to build locally
 # mmtk = { path = "../repos/mmtk-core" }
 
diff --git a/mmtk/src/lib.rs b/mmtk/src/lib.rs
index 546091d..d874466 100644
--- a/mmtk/src/lib.rs
+++ b/mmtk/src/lib.rs
@@ -51,7 +51,7 @@ pub struct V8;
 ///
 /// TODO: We start with Address to transition from the old API.
 /// We should define an edge type suitable for V8.
-pub type V8Edge = Address;
+pub type V8Slot = Address;
 
 impl VMBinding for V8 {
     type VMObjectModel = object_model::VMObjectModel;
@@ -60,8 +60,8 @@ impl VMBinding for V8 {
     type VMActivePlan = active_plan::VMActivePlan;
     type VMReferenceGlue = reference_glue::VMReferenceGlue;
 
-    type VMEdge = V8Edge;
-    type VMMemorySlice = mmtk::vm::edge_shape::UnimplementedMemorySlice<V8Edge>;
+    type VMSlot = V8Slot;
+    type VMMemorySlice = mmtk::vm::slot::UnimplementedMemorySlice<V8Slot>;
 
     const MAX_ALIGNMENT: usize = 32;
 }
diff --git a/mmtk/src/scanning.rs b/mmtk/src/scanning.rs
index bdcd55a..8eb3cdf 100644
--- a/mmtk/src/scanning.rs
+++ b/mmtk/src/scanning.rs
@@ -1,16 +1,16 @@
 use mmtk::util::opaque_pointer::*;
 use mmtk::util::ObjectReference;
-use mmtk::vm::EdgeVisitor;
 use mmtk::vm::RootsWorkFactory;
 use mmtk::vm::Scanning;
+use mmtk::vm::SlotVisitor;
 use mmtk::Mutator;
-use V8Edge;
+use V8Slot;
 use V8;
 
 pub struct VMScanning {}
 
 impl Scanning<V8> for VMScanning {
-    fn scan_object<EV: EdgeVisitor<V8Edge>>(
+    fn scan_object<EV: SlotVisitor<V8Slot>>(
         _tls: VMWorkerThread,
         _object: ObjectReference,
         _edge_visitor: &mut EV,
@@ -25,12 +25,12 @@ impl Scanning<V8> for VMScanning {
     fn scan_roots_in_mutator_thread(
         _tls: VMWorkerThread,
         _mutator: &'static mut Mutator<V8>,
-        _factory: impl RootsWorkFactory<V8Edge>,
+        _factory: impl RootsWorkFactory<V8Slot>,
     ) {
         unimplemented!()
     }
 
-    fn scan_vm_specific_roots(_tls: VMWorkerThread, _factory: impl RootsWorkFactory<V8Edge>) {
+    fn scan_vm_specific_roots(_tls: VMWorkerThread, _factory: impl RootsWorkFactory<V8Slot>) {
         unimplemented!()
     }