diff --git a/.github/mergify.yml b/.github/mergify.yml
new file mode 100644
index 00000000..67bc7897
--- /dev/null
+++ b/.github/mergify.yml
@@ -0,0 +1,34 @@
+pull_request_rules:
+  - name: backport patches to v1.8.2+RAI
+    conditions:
+      - base=master
+      - label=backport-v1.8.2+RAI
+    actions:
+      backport:
+        branches:
+          - v1.8.2+RAI
+        assignees:
+          - "{{ author }}"
+        label_conflicts: backport-conflicts
+  - name: backport patches to v1.9.2+RAI
+    conditions:
+      - base=master
+      - label=backport-v1.9.2+RAI
+    actions:
+      backport:
+        branches:
+          - v1.9.2+RAI
+        assignees:
+          - "{{ author }}"
+        label_conflicts: backport-conflicts
+  - name: backport patches to dev
+    conditions:
+      - base=master
+      - label=backport-dev
+    actions:
+      backport:
+        branches:
+          - dev
+        assignees:
+          - "{{ author }}"
+        label_conflicts: backport-conflicts
diff --git a/mmtk/Cargo.lock b/mmtk/Cargo.lock
index a54b8f49..0eda96c0 100644
--- a/mmtk/Cargo.lock
+++ b/mmtk/Cargo.lock
@@ -1,6 +1,6 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 3
+version = 4
 
 [[package]]
 name = "aho-corasick"
@@ -573,7 +573,7 @@ checksum = "68354c5c6bd36d73ff3feceb05efa59b6acb7626617f4962be322a825e61f79a"
 [[package]]
 name = "mmtk"
 version = "0.30.0"
-source = "git+https://github.com/qinsoon/mmtk-core.git?rev=7ce3d8a0c26d64b535c5a1b9ffd4c70037351fac#7ce3d8a0c26d64b535c5a1b9ffd4c70037351fac"
+source = "git+https://github.com/mmtk/mmtk-core.git?rev=ec745353a8de72b645613e0fef3ab7f5f1ad9bd1#ec745353a8de72b645613e0fef3ab7f5f1ad9bd1"
 dependencies = [
  "atomic 0.6.0",
  "atomic-traits",
@@ -627,7 +627,7 @@ dependencies = [
 [[package]]
 name = "mmtk-macros"
 version = "0.30.0"
-source = "git+https://github.com/qinsoon/mmtk-core.git?rev=7ce3d8a0c26d64b535c5a1b9ffd4c70037351fac#7ce3d8a0c26d64b535c5a1b9ffd4c70037351fac"
+source = "git+https://github.com/mmtk/mmtk-core.git?rev=ec745353a8de72b645613e0fef3ab7f5f1ad9bd1#ec745353a8de72b645613e0fef3ab7f5f1ad9bd1"
 dependencies = [
  "proc-macro-error",
  "proc-macro2",
diff --git a/mmtk/Cargo.toml b/mmtk/Cargo.toml
index 4ef7b86a..828e63e6 100644
--- a/mmtk/Cargo.toml
+++ b/mmtk/Cargo.toml
@@ -27,7 +27,7 @@ lazy_static = "1.1"
 # - 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 = "c0f97884234b51b13c8ba5d1563a8e0f592d11c2" }
+mmtk = { git = "https://github.com/mmtk/mmtk-core.git", rev = "ec745353a8de72b645613e0fef3ab7f5f1ad9bd1" }
 # Uncomment the following to build locally
 # mmtk = { path = "../repos/mmtk-core" }
 log = {version = "0.4", features = ["max_level_trace", "release_max_level_off"] }
diff --git a/mmtk/rust-toolchain b/mmtk/rust-toolchain
index ef8b0923..6b4de0a4 100644
--- a/mmtk/rust-toolchain
+++ b/mmtk/rust-toolchain
@@ -1 +1 @@
-1.77.0
\ No newline at end of file
+1.83.0