diff --git a/mmtk/Cargo.lock b/mmtk/Cargo.lock
index c74bc311..a971e790 100644
--- a/mmtk/Cargo.lock
+++ b/mmtk/Cargo.lock
@@ -459,7 +459,7 @@ dependencies = [
 [[package]]
 name = "mmtk"
 version = "0.31.0"
-source = "git+https://github.com/mmtk/mmtk-core.git?rev=7d798ad8a71aa6df80f58f5e565e4f9274d06871#7d798ad8a71aa6df80f58f5e565e4f9274d06871"
+source = "git+https://github.com/qinsoon/mmtk-core.git?rev=cabdd668972fb883e05385ce94259e3b01357798#cabdd668972fb883e05385ce94259e3b01357798"
 dependencies = [
  "atomic",
  "atomic-traits",
@@ -485,6 +485,7 @@ dependencies = [
  "num_cpus",
  "portable-atomic",
  "probe",
+ "rayon-core",
  "regex",
  "rustversion",
  "spin",
@@ -497,7 +498,7 @@ dependencies = [
 [[package]]
 name = "mmtk-macros"
 version = "0.31.0"
-source = "git+https://github.com/mmtk/mmtk-core.git?rev=7d798ad8a71aa6df80f58f5e565e4f9274d06871#7d798ad8a71aa6df80f58f5e565e4f9274d06871"
+source = "git+https://github.com/qinsoon/mmtk-core.git?rev=cabdd668972fb883e05385ce94259e3b01357798#cabdd668972fb883e05385ce94259e3b01357798"
 dependencies = [
  "proc-macro-error",
  "proc-macro2",
diff --git a/mmtk/Cargo.toml b/mmtk/Cargo.toml
index 6a33a938..dc9ff4de 100644
--- a/mmtk/Cargo.toml
+++ b/mmtk/Cargo.toml
@@ -35,7 +35,7 @@ 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 = "7d798ad8a71aa6df80f58f5e565e4f9274d06871" }
+mmtk = { git = "https://github.com/qinsoon/mmtk-core.git", rev = "cabdd668972fb883e05385ce94259e3b01357798" }
 # Uncomment the following to build locally
 # mmtk = { path = "../repos/mmtk-core" }