diff --git a/julia/mmtk_julia.c b/julia/mmtk_julia.c
index d948bd0d..64967e9f 100644
--- a/julia/mmtk_julia.c
+++ b/julia/mmtk_julia.c
@@ -96,6 +96,34 @@ JL_DLLEXPORT jl_value_t *jl_mmtk_gc_alloc_big(jl_ptls_t ptls, size_t sz)
     return result;
 }
 
+// allocating in a non-moving space
+JL_DLLEXPORT jl_value_t *jl_mmtk_gc_alloc_non_moving(jl_ptls_t ptls,
+                                                    int osize, void *ty)
+{
+    // safepoint
+    jl_gc_safepoint_(ptls);
+
+    jl_value_t *v;
+    if ((uintptr_t)ty != jl_buff_tag) {
+        // v needs to be 16 byte aligned, therefore v_tagged needs to be offset accordingly to consider the size of header
+        jl_taggedvalue_t *v_tagged = (jl_taggedvalue_t *)mmtk_alloc(&ptls->mmtk_mutator, LLT_ALIGN(osize, 16), 16, sizeof(jl_taggedvalue_t), 6);
+        v = jl_valueof(v_tagged);
+        mmtk_non_moving_post_alloc_fast(&ptls->mmtk_mutator, v, osize);
+    } else {
+        // allocating an extra word to store the size of buffer objects
+        jl_taggedvalue_t *v_tagged = (jl_taggedvalue_t *)mmtk_alloc(&ptls->mmtk_mutator, LLT_ALIGN(osize+sizeof(jl_taggedvalue_t), 16), 16, 0, 6);
+        jl_value_t* v_tagged_aligned = ((jl_value_t*)((char*)(v_tagged) + sizeof(jl_taggedvalue_t)));
+        v = jl_valueof(v_tagged_aligned);
+        mmtk_store_obj_size_c(v, osize + sizeof(jl_taggedvalue_t));
+        mmtk_non_moving_post_alloc_fast(&ptls->mmtk_mutator, v, osize + sizeof(jl_taggedvalue_t));
+    }
+
+    ptls->gc_num.allocd += osize;
+    ptls->gc_num.poolalloc++;
+
+    return v;
+}
+
 static void mmtk_sweep_malloced_arrays(void) JL_NOTSAFEPOINT
 {
     void* iter = new_mutator_iterator();
diff --git a/mmtk/Cargo.lock b/mmtk/Cargo.lock
index 32eda2a7..f428777f 100644
--- a/mmtk/Cargo.lock
+++ b/mmtk/Cargo.lock
@@ -474,7 +474,7 @@ dependencies = [
 [[package]]
 name = "mmtk"
 version = "0.19.0"
-source = "git+https://github.com/qinsoon/mmtk-core.git?rev=99d2d9ad25b3a36cea52b0f4ffdc24b16e0ee720#99d2d9ad25b3a36cea52b0f4ffdc24b16e0ee720"
+source = "git+https://github.com/mmtk/mmtk-core.git?rev=a504184311d490dd1c7ee36bab87b61a671038a1#a504184311d490dd1c7ee36bab87b61a671038a1"
 dependencies = [
  "atomic 0.5.3",
  "atomic-traits",
@@ -523,7 +523,7 @@ dependencies = [
 [[package]]
 name = "mmtk-macros"
 version = "0.19.0"
-source = "git+https://github.com/qinsoon/mmtk-core.git?rev=99d2d9ad25b3a36cea52b0f4ffdc24b16e0ee720#99d2d9ad25b3a36cea52b0f4ffdc24b16e0ee720"
+source = "git+https://github.com/mmtk/mmtk-core.git?rev=a504184311d490dd1c7ee36bab87b61a671038a1#a504184311d490dd1c7ee36bab87b61a671038a1"
 dependencies = [
  "proc-macro-error",
  "proc-macro2",
diff --git a/mmtk/Cargo.toml b/mmtk/Cargo.toml
index db615c97..f58f4d22 100644
--- a/mmtk/Cargo.toml
+++ b/mmtk/Cargo.toml
@@ -9,8 +9,8 @@ edition = "2018"
 # Metadata for the Julia repository
 [package.metadata.julia]
 # Our CI matches the following line and extract mmtk/julia. If this line is updated, please check ci yaml files and make sure it works.
-julia_repo = "https://github.com/mmtk/julia.git"
-julia_version = "83796a7d38878faa9afdb94ce84b6da00035b336"
+julia_repo = "https://github.com/udesou/julia.git"
+julia_version = "0e0adf1cb1f5193c6f6a8b0fd0dc0561c8e04f44"
 
 [lib]
 crate-type = ["cdylib"]