diff --git a/mmtk/Cargo.toml b/mmtk/Cargo.toml
index aaba99ed..f98af1dc 100644
--- a/mmtk/Cargo.toml
+++ b/mmtk/Cargo.toml
@@ -2,7 +2,7 @@
 name = "mmtk_openjdk"
 version = "0.30.0"
 authors = [" <>"]
-rust-version = "1.73.0"
+rust-version = "1.74.1"
 build = "build.rs"
 edition = "2021"
 
@@ -35,12 +35,12 @@ probe = "0.5"
 # - 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 = "ec745353a8de72b645613e0fef3ab7f5f1ad9bd1" }
+mmtk = { git = "https://github.com/mmtk/mmtk-core.git", rev = "f67a0d2fc0bf3d18d34348949dff969d4d202bbc" }
 # Uncomment the following to build locally
 # mmtk = { path = "../repos/mmtk-core" }
 
 [build-dependencies]
-built = { version = "0.7.1", features = ["git2"] }
+built = { version = "0.7.7", features = ["git2"] }
 
 [features]
 default = []
diff --git a/mmtk/src/scanning.rs b/mmtk/src/scanning.rs
index 528b940d..3b0c4aac 100644
--- a/mmtk/src/scanning.rs
+++ b/mmtk/src/scanning.rs
@@ -12,7 +12,7 @@ use mmtk::MutatorContext;
 
 pub struct VMScanning {}
 
-pub(crate) const WORK_PACKET_CAPACITY: usize = 4096;
+pub(crate) const WORK_PACKET_CAPACITY: usize = mmtk::scheduler::EDGES_WORK_BUFFER_SIZE;
 
 extern "C" fn report_slots_and_renew_buffer<S: Slot, F: RootsWorkFactory<S>>(
     ptr: *mut Address,