diff --git a/mmtk/Cargo.lock b/mmtk/Cargo.lock
index ef65098..ae062ac 100644
--- a/mmtk/Cargo.lock
+++ b/mmtk/Cargo.lock
@@ -13,9 +13,12 @@ dependencies = [
 
 [[package]]
 name = "atomic"
-version = "0.5.3"
+version = "0.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c59bdb34bc650a32731b31bd8f0829cc15d24a708ee31559e0bb34f2bc320cba"
+checksum = "8d818003e740b63afc82337e3160717f4f63078720a810b7b903e70a5d1d2994"
+dependencies = [
+ "bytemuck",
+]
 
 [[package]]
 name = "atomic-traits"
@@ -39,12 +42,6 @@ version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d468802bab17cbc0cc575e9b053f41e72aa36bfa6b7f55e3529ffa43161b97fa"
 
-[[package]]
-name = "bitflags"
-version = "1.3.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
-
 [[package]]
 name = "bitflags"
 version = "2.4.0"
@@ -53,24 +50,31 @@ checksum = "b4682ae6287fcf752ecaabbfcc7b6f9b72aa33933dc23a554d853aea8eea8635"
 
 [[package]]
 name = "built"
-version = "0.6.0"
+version = "0.7.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "96f9cdd34d6eb553f9ea20e5bf84abb7b13c729f113fc1d8e49dc00ad9fa8738"
+checksum = "38d17f4d6e4dc36d1a02fbedc2753a096848e7c1b0772f7654eab8e2c927dd53"
 dependencies = [
- "cargo-lock",
  "git2",
 ]
 
 [[package]]
-name = "cargo-lock"
-version = "8.0.3"
+name = "bytemuck"
+version = "1.14.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "031718ddb8f78aa5def78a09e90defe30151d1f6c672f937af4dd916429ed996"
+checksum = "ed2490600f404f2b94c167e31d3ed1d5f3c225a0f3b80230053b3e0b7b962bd9"
 dependencies = [
- "semver 1.0.18",
- "serde",
- "toml",
- "url",
+ "bytemuck_derive",
+]
+
+[[package]]
+name = "bytemuck_derive"
+version = "1.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "965ab7eb5f8f97d2a083c799f3a1b994fc397b2fe2da5d1da1626ce15a39f2b1"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.31",
 ]
 
 [[package]]
@@ -164,9 +168,9 @@ dependencies = [
 
 [[package]]
 name = "delegate"
-version = "0.9.0"
+version = "0.10.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d358e0ec5c59a5e1603b933def447096886121660fc680dc1e64a0753981fe3c"
+checksum = "0ee5df75c70b95bd3aacc8e2fd098797692fb1d54121019c4de481e42f04c8a1"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -250,11 +254,11 @@ dependencies = [
 
 [[package]]
 name = "git2"
-version = "0.16.1"
+version = "0.18.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ccf7f68c2995f392c49fffb4f95ae2c873297830eb25c6bc4c114ce8f4562acc"
+checksum = "fbf97ba92db08df386e10c8ede66a2a0369bd277090afd8710e19e38de9ec0cd"
 dependencies = [
- "bitflags 1.3.2",
+ "bitflags",
  "libc",
  "libgit2-sys",
  "log",
@@ -302,9 +306,9 @@ dependencies = [
 
 [[package]]
 name = "itertools"
-version = "0.10.5"
+version = "0.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b0fd2260e829bddf4cb6ea802289de2f86d6a7a690192fbe91b3f46e0f2c8473"
+checksum = "ba291022dbbd398a455acf126c1e341954079855bc60dfdda641363bd6922569"
 dependencies = [
  "either",
 ]
@@ -332,9 +336,9 @@ checksum = "b4668fb0ea861c1df094127ac5f1da3409a82116a4ba74fca2e58ef927159bb3"
 
 [[package]]
 name = "libgit2-sys"
-version = "0.14.2+1.5.1"
+version = "0.16.1+1.7.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7f3d95f6b51075fe9810a7ae22c7095f12b98005ab364d8544797a825ce946a4"
+checksum = "f2a2bb3680b094add03bb3732ec520ece34da31a8cd2d633d1389d0f0fb60d0c"
 dependencies = [
  "cc",
  "libc",
@@ -393,13 +397,14 @@ dependencies = [
 
 [[package]]
 name = "mmtk"
-version = "0.20.0"
-source = "git+https://github.com/mmtk/mmtk-core.git?rev=57af17fbfd94ff0df2cd3b1e504abe299ce4f0ab#57af17fbfd94ff0df2cd3b1e504abe299ce4f0ab"
+version = "0.24.0"
+source = "git+https://github.com/mmtk/mmtk-core.git?rev=5ab62f96c006475285b00b6d20a8b1bf83b74a4d#5ab62f96c006475285b00b6d20a8b1bf83b74a4d"
 dependencies = [
  "atomic",
  "atomic-traits",
  "atomic_refcell",
  "built",
+ "bytemuck",
  "cfg-if",
  "crossbeam",
  "delegate",
@@ -427,8 +432,8 @@ dependencies = [
 
 [[package]]
 name = "mmtk-macros"
-version = "0.20.0"
-source = "git+https://github.com/mmtk/mmtk-core.git?rev=57af17fbfd94ff0df2cd3b1e504abe299ce4f0ab#57af17fbfd94ff0df2cd3b1e504abe299ce4f0ab"
+version = "0.24.0"
+source = "git+https://github.com/mmtk/mmtk-core.git?rev=5ab62f96c006475285b00b6d20a8b1bf83b74a4d#5ab62f96c006475285b00b6d20a8b1bf83b74a4d"
 dependencies = [
  "proc-macro-error",
  "proc-macro2",
@@ -614,7 +619,7 @@ version = "0.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f0dfe2087c51c460008730de8b57e6a320782fbfb312e1f4d520e6c6fae155ee"
 dependencies = [
- "semver 0.11.0",
+ "semver",
 ]
 
 [[package]]
@@ -623,7 +628,7 @@ version = "0.38.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c0c3dde1fc030af041adc40e79c0e7fbcf431dd24870053d187d7c66e4b87453"
 dependencies = [
- "bitflags 2.4.0",
+ "bitflags",
  "errno",
  "libc",
  "linux-raw-sys",
@@ -651,15 +656,6 @@ dependencies = [
  "semver-parser",
 ]
 
-[[package]]
-name = "semver"
-version = "1.0.18"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b0293b4b29daaf487284529cc2f5675b8e57c61f70167ba415a463651fd6a918"
-dependencies = [
- "serde",
-]
-
 [[package]]
 name = "semver-parser"
 version = "0.10.2"
@@ -669,26 +665,6 @@ dependencies = [
  "pest",
 ]
 
-[[package]]
-name = "serde"
-version = "1.0.188"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cf9e0fcba69a370eed61bcf2b728575f726b50b55cba78064753d708ddc7549e"
-dependencies = [
- "serde_derive",
-]
-
-[[package]]
-name = "serde_derive"
-version = "1.0.188"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4eca7ac642d82aa35b60049a6eccb4be6be75e599bd2e9adb5f875a737654af2"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn 2.0.31",
-]
-
 [[package]]
 name = "spin"
 version = "0.9.8"
@@ -706,21 +682,21 @@ checksum = "a2eb9349b6444b326872e140eb1cf5e7c522154d69e7a0ffb0fb81c06b37543f"
 
 [[package]]
 name = "strum"
-version = "0.24.1"
+version = "0.25.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "063e6045c0e62079840579a7e47a355ae92f60eb74daaf156fb1e84ba164e63f"
+checksum = "290d54ea6f91c969195bdbcd7442c8c2a2ba87da8bf60a7ee86a235d4bc1e125"
 
 [[package]]
 name = "strum_macros"
-version = "0.24.3"
+version = "0.25.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1e385be0d24f186b4ce2f9982191e7101bb737312ad61c1f2f984f34bcf85d59"
+checksum = "23dc1fa9ac9c169a78ba62f0b841814b7abae11bdd047b9c58f893439e309ea0"
 dependencies = [
  "heck",
  "proc-macro2",
  "quote",
  "rustversion",
- "syn 1.0.109",
+ "syn 2.0.31",
 ]
 
 [[package]]
@@ -804,15 +780,6 @@ version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1f3ccbac311fea05f86f61904b462b55fb3df8837a366dfc601a0161d0532f20"
 
-[[package]]
-name = "toml"
-version = "0.5.11"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f4f7f0dd8d50a853a531c426359045b1998f04219d88799810762cd4ad314234"
-dependencies = [
- "serde",
-]
-
 [[package]]
 name = "ucd-trie"
 version = "0.1.6"
diff --git a/mmtk/Cargo.toml b/mmtk/Cargo.toml
index 3ff8500..5ac38de 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 = "57af17fbfd94ff0df2cd3b1e504abe299ce4f0ab" }
+mmtk = { git = "https://github.com/mmtk/mmtk-core.git", rev="5ab62f96c006475285b00b6d20a8b1bf83b74a4d" }
 # Uncomment the following and fix the path to mmtk-core to build locally
 # mmtk = { path = "../repos/mmtk-core" }
 
diff --git a/mmtk/src/api.rs b/mmtk/src/api.rs
index 6a722dc..2e3c051 100644
--- a/mmtk/src/api.rs
+++ b/mmtk/src/api.rs
@@ -1,7 +1,7 @@
 use libc::c_char;
 use libc::c_void;
 use mmtk::memory_manager;
-use mmtk::scheduler::{GCController, GCWorker};
+use mmtk::scheduler::GCWorker;
 use mmtk::util::opaque_pointer::*;
 use mmtk::util::{Address, ObjectReference};
 use mmtk::AllocationSemantics;
@@ -97,18 +97,6 @@ pub extern "C" fn will_never_move(object: ObjectReference) -> bool {
     !object.is_movable()
 }
 
-#[no_mangle]
-// We trust the worker pointer is valid.
-#[allow(clippy::not_unsafe_ptr_arg_deref)]
-pub extern "C" fn start_control_collector(
-    mmtk: &'static mut MMTK<V8>,
-    tls: VMWorkerThread,
-    gc_controller: *mut GCController<V8>,
-) {
-    let mut gc_controller = unsafe { Box::from_raw(gc_controller) };
-    memory_manager::start_control_collector(&*mmtk, tls, &mut gc_controller);
-}
-
 #[no_mangle]
 // We trust the worker pointer is valid.
 #[allow(clippy::not_unsafe_ptr_arg_deref)]
@@ -117,8 +105,8 @@ pub extern "C" fn start_worker(
     tls: VMWorkerThread,
     worker: *mut GCWorker<V8>,
 ) {
-    let mut worker = unsafe { Box::from_raw(worker) };
-    memory_manager::start_worker::<V8>(mmtk, tls, &mut worker);
+    let worker = unsafe { Box::from_raw(worker) };
+    memory_manager::start_worker::<V8>(mmtk, tls, worker);
 }
 
 #[no_mangle]
diff --git a/mmtk/src/collection.rs b/mmtk/src/collection.rs
index ac7d851..ea39a81 100644
--- a/mmtk/src/collection.rs
+++ b/mmtk/src/collection.rs
@@ -5,7 +5,6 @@ use mmtk::Mutator;
 use UPCALLS;
 use V8;
 
-const GC_THREAD_KIND_CONTROLLER: libc::c_int = 0;
 const GC_THREAD_KIND_WORKER: libc::c_int = 1;
 
 pub struct VMCollection {}
@@ -34,10 +33,6 @@ impl Collection<V8> for VMCollection {
 
     fn spawn_gc_thread(tls: VMThread, ctx: GCThreadContext<V8>) {
         let (ctx_ptr, kind) = match ctx {
-            GCThreadContext::Controller(b) => (
-                Box::into_raw(b) as *mut libc::c_void,
-                GC_THREAD_KIND_CONTROLLER,
-            ),
             GCThreadContext::Worker(b) => {
                 (Box::into_raw(b) as *mut libc::c_void, GC_THREAD_KIND_WORKER)
             }
diff --git a/v8/third_party/heap/mmtk/mmtk.h b/v8/third_party/heap/mmtk/mmtk.h
index a2b94b9..ae6ded8 100644
--- a/v8/third_party/heap/mmtk/mmtk.h
+++ b/v8/third_party/heap/mmtk/mmtk.h
@@ -52,7 +52,6 @@ extern bool process(void* builder, char* name, char* value);
 extern void scan_region(void *mmtk);
 extern void handle_user_collection_request(void *mmtk, void *tls);
 
-extern void start_control_collector(void *tls, void* controller);
 extern void start_worker(void *tls, void* worker);
 
 /**