diff --git a/mmtk/Cargo.lock b/mmtk/Cargo.lock
index e1e7d10..944c0f2 100644
--- a/mmtk/Cargo.lock
+++ b/mmtk/Cargo.lock
@@ -425,7 +425,7 @@ dependencies = [
 [[package]]
 name = "mmtk"
 version = "0.26.0"
-source = "git+https://github.com/mmtk/mmtk-core.git?rev=a3a72f8e5795678eff06fdc1524f0b429a62ccc0#a3a72f8e5795678eff06fdc1524f0b429a62ccc0"
+source = "git+https://github.com/mmtk/mmtk-core.git?rev=9a49d6a938f0c3143750e8415622dfe679b3ddb8#9a49d6a938f0c3143750e8415622dfe679b3ddb8"
 dependencies = [
  "atomic",
  "atomic-traits",
@@ -460,7 +460,7 @@ dependencies = [
 [[package]]
 name = "mmtk-macros"
 version = "0.26.0"
-source = "git+https://github.com/mmtk/mmtk-core.git?rev=a3a72f8e5795678eff06fdc1524f0b429a62ccc0#a3a72f8e5795678eff06fdc1524f0b429a62ccc0"
+source = "git+https://github.com/mmtk/mmtk-core.git?rev=9a49d6a938f0c3143750e8415622dfe679b3ddb8#9a49d6a938f0c3143750e8415622dfe679b3ddb8"
 dependencies = [
  "proc-macro-error",
  "proc-macro2",
diff --git a/mmtk/Cargo.toml b/mmtk/Cargo.toml
index f31b25f..4c374de 100644
--- a/mmtk/Cargo.toml
+++ b/mmtk/Cargo.toml
@@ -27,10 +27,10 @@ log = "*"
 # - 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 = "a3a72f8e5795678eff06fdc1524f0b429a62ccc0" }
+mmtk = { git = "https://github.com/mmtk/mmtk-core.git", rev = "9a49d6a938f0c3143750e8415622dfe679b3ddb8" }
 # Uncomment the following and fix the path to mmtk-core to build locally
 # mmtk = { path = "../repos/mmtk-core" }
 
 [features]
-default = ["mmtk/code_space", "mmtk/ro_space"]
+default = ["mmtk/code_space", "mmtk/ro_space", "mmtk/exec_permission_on_all_spaces"]
 nogc = []