diff --git a/mmtk/Cargo.lock b/mmtk/Cargo.lock
index e2dd50c..fc6c0c3 100644
--- a/mmtk/Cargo.lock
+++ b/mmtk/Cargo.lock
@@ -431,7 +431,7 @@ dependencies = [
 [[package]]
 name = "mmtk"
 version = "0.26.0"
-source = "git+https://github.com/mmtk/mmtk-core.git?rev=f9b85bca5b1ae530854e09d553f3020edde46cdb#f9b85bca5b1ae530854e09d553f3020edde46cdb"
+source = "git+https://github.com/wks/mmtk-core.git?rev=7d3f79d4e50dacec881252562c8c7946e2513e55#7d3f79d4e50dacec881252562c8c7946e2513e55"
 dependencies = [
  "atomic",
  "atomic-traits",
@@ -467,7 +467,7 @@ dependencies = [
 [[package]]
 name = "mmtk-macros"
 version = "0.26.0"
-source = "git+https://github.com/mmtk/mmtk-core.git?rev=f9b85bca5b1ae530854e09d553f3020edde46cdb#f9b85bca5b1ae530854e09d553f3020edde46cdb"
+source = "git+https://github.com/wks/mmtk-core.git?rev=7d3f79d4e50dacec881252562c8c7946e2513e55#7d3f79d4e50dacec881252562c8c7946e2513e55"
 dependencies = [
  "proc-macro-error",
  "proc-macro2",
diff --git a/mmtk/Cargo.toml b/mmtk/Cargo.toml
index b04d995..0dcb56c 100644
--- a/mmtk/Cargo.toml
+++ b/mmtk/Cargo.toml
@@ -36,8 +36,8 @@ probe = "0.5"
 features = ["is_mmtk_object", "object_pinning", "sticky_immix_non_moving_nursery"]
 
 # Uncomment the following lines to use mmtk-core from the official repository.
-git = "https://github.com/mmtk/mmtk-core.git"
-rev = "f9b85bca5b1ae530854e09d553f3020edde46cdb"
+git = "https://github.com/wks/mmtk-core.git"
+rev = "7d3f79d4e50dacec881252562c8c7946e2513e55"
 
 # Uncomment the following line to use mmtk-core from a local repository.
 # path = "../../mmtk-core"
diff --git a/mmtk/src/api.rs b/mmtk/src/api.rs
index 2b2500a..bb4511b 100644
--- a/mmtk/src/api.rs
+++ b/mmtk/src/api.rs
@@ -374,3 +374,20 @@ pub extern "C" fn mmtk_object_reference_write_post(
         ignored_target,
     )
 }
+
+#[no_mangle]
+pub extern "C" fn mmtk_print_all_objects() {
+    crate::mmtk().enumerate_objects(|object| {
+        println!("{object}");
+    })
+}
+
+#[no_mangle]
+pub extern "C" fn mmtk_enumerate_objects(
+    callback: extern "C" fn(ObjectReference, *mut libc::c_void),
+    data: *mut libc::c_void,
+) {
+    crate::mmtk().enumerate_objects(|object| {
+        callback(object, data);
+    })
+}